Tag Archives: electric motor

China Hot selling Professional Micro Knurling Stainless Steel High Tolerance Electric Motor Fan Shaft by CNC Turning near me factory

Product Description


Product Description

Business type Factory/manufacturer


CNC machining
Turning and milling
CNC turning
OEM parts


(1) Aluminum:AL 6061-T6,6063,7075-T
(2)Stainless steel:303,304,316L,17-4(SUS630)
(6)Copper, bronze, magnesium alloy, Delan, POM, acrylic, PC, etc.
Service OEM/ODM avaliable


Sandblasting, anodizing, Blackenning, zinc/Nickl plating, Poland
Powder coating, passivation PVD plating titanium, electrogalvanization
Chrome plating, electrophoresis, QPQ
Electrochemical polishing, chrome plating, knurling, laser etching Logo
Major equipment CNC machining center (milling machine), CNC lathe, grinding machine
Cylindrical grinding machine, drilling machine, laser cutting machine
Graphic format STEP, STP, GIS, CAD, PDF, DWG, DXF and other samples
Tolerance +/-0.003mm
Surface roughness Ra0.1~3.2
Inspection Complete testing laboratory with micrometer, optical comparator, caliper vernier, CMM
Depth caliper vernier, universal protractor, clock gauge, internal Celsius gauge

Detailed Photos

Product Parameters

Aluminum Stainless Steel Brass Copper Plastic Iron
AL2571 SS201 C22000 C15710 POM Q235
ALA380 SS301 C24000 C11000 PEEK Q345B
AL5052 SS303 C26000 C12000 PVC 1214 / 1215
AL6061 SS304 C28000 C12200 ABS 45#
AL6063 SS316 C35600 etc. Nylon 20#
AL6082 SS416 C36000   PP 4140 / 4130
AL7075 etc. C37000   Delrin 12L14
etc.   etc.   etc. etc.
Aluminum Parts Stainless Steel Parts Steel Parts Brass Parts
Clear Anodized Polishing Zinc Plating Nickel Plating
Color Anodized Passivating Oxide black chrome plating
Sandblast Anodized Sandblasting Nickel Plating Electrophoresis black
Chemical Film Laser engraving Powder Coated Powder coated
Brushing Electrophoresis black Heat treatment Gold plating
Polishing Oxide black Chrome Plating etc.
Chroming etc etc  
The smallest tolerance can reach +/-0.001mm or as per drawing request.
PFD Step Igs CAD Solid etc

Packaging & Shipping

Company Profile

HangZhou Shinemotor Co.,Ltd located in HangZhou City, ZheJiang Province of China.
Mainly specializes in developing, manufacturing and selling all kinds of customized metal and plastic parts.

Our factory pass SGS, ISO9001/ ISO9001/ ISO14001 verification, parts can be widely used in the fields of automobile,
medical instruments, electronic communications, industrial and consumer applications and so on.

We have introduced a series of advanced and high performance production equipment imported from Japan and ZheJiang :
High precision cnc lathes, 5/6 axis cnc machining centers, plane grinding & centerless grinding machines,
stamping machines, wire cut machines, EDM and many other high-precision CNC equipment.
Our inspection equipment includes: projector, 2D, 2.5D, CMM, hardness testing machine, tool microscope, etc.

We dedicated to developing and producing kinds of brass, aluminum, steel, stainless steel
And plastic machining parts, stamping parts, and also CZPT design and manufacturing.

We firmly hold the concept of  ” customer is the first, honesty is the basic, accrete win-win “. 
Dedicated to providing you with high-quality products and excellent service!
We sincerely look forward to creating a better future by mutually beneficial cooperation with you.


1. Are you a factory or a trading company?

A: We are a factory which has been specialized in cnc machining & automatic manufacturing for more than 10 years.

2. Where is your factory and how can I visit it?
A: Our factory is located in HangZhou city and you can get more detailed information by browsing our website.

3. How long can I get some samples for checking and what about the price?
A: Normally samples will be done within 1-2 days (automatic machining parts) or 3-5 day (cnc machining parts).
The sample cost depends on all information (size, material, finish, etc.).
We will return the sample cost if your order quantity is good.

4. How is the warranty of the products quality control?
A: We hold the tightend quality controlling from very begining to the end and aim at 100% error free.

5.How to get an accurate quotation?
♦ Drawings, photos, detailed sizes or samples of products.
♦ Material of products.
♦ Ordinary purchasing quantity.
 Quotation within 1~6 hours


How to Calculate Stiffness, Centering Force, Wear and Fatigue Failure of Spline Couplings

There are various types of spline couplings. These couplings have several important properties. These properties are: Stiffness, Involute splines, Misalignment, Wear and fatigue failure. To understand how these characteristics relate to spline couplings, read this article. It will give you the necessary knowledge to determine which type of coupling best suits your needs. Keeping in mind that spline couplings are usually spherical in shape, they are made of steel.

Involute splines

An effective side interference condition minimizes gear misalignment. When 2 splines are coupled with no spline misalignment, the maximum tensile root stress shifts to the left by 5 mm. A linear lead variation, which results from multiple connections along the length of the spline contact, increases the effective clearance or interference by a given percentage. This type of misalignment is undesirable for coupling high-speed equipment.
Involute splines are often used in gearboxes. These splines transmit high torque, and are better able to distribute load among multiple teeth throughout the coupling circumference. The involute profile and lead errors are related to the spacing between spline teeth and keyways. For coupling applications, industry practices use splines with 25 to 50-percent of spline teeth engaged. This load distribution is more uniform than that of conventional single-key couplings.
To determine the optimal tooth engagement for an involved spline coupling, Xiangzhen Xue and colleagues used a computer model to simulate the stress applied to the splines. The results from this study showed that a “permissible” Ruiz parameter should be used in coupling. By predicting the amount of wear and tear on a crowned spline, the researchers could accurately predict how much damage the components will sustain during the coupling process.
There are several ways to determine the optimal pressure angle for an involute spline. Involute splines are commonly measured using a pressure angle of 30 degrees. Similar to gears, involute splines are typically tested through a measurement over pins. This involves inserting specific-sized wires between gear teeth and measuring the distance between them. This method can tell whether the gear has a proper tooth profile.
The spline system shown in Figure 1 illustrates a vibration model. This simulation allows the user to understand how involute splines are used in coupling. The vibration model shows 4 concentrated mass blocks that represent the prime mover, the internal spline, and the load. It is important to note that the meshing deformation function represents the forces acting on these 3 components.

Stiffness of coupling

The calculation of stiffness of a spline coupling involves the measurement of its tooth engagement. In the following, we analyze the stiffness of a spline coupling with various types of teeth using 2 different methods. Direct inversion and blockwise inversion both reduce CPU time for stiffness calculation. However, they require evaluation submatrices. Here, we discuss the differences between these 2 methods.
The analytical model for spline couplings is derived in the second section. In the third section, the calculation process is explained in detail. We then validate this model against the FE method. Finally, we discuss the influence of stiffness nonlinearity on the rotor dynamics. Finally, we discuss the advantages and disadvantages of each method. We present a simple yet effective method for estimating the lateral stiffness of spline couplings.
The numerical calculation of the spline coupling is based on the semi-analytical spline load distribution model. This method involves refined contact grids and updating the compliance matrix at each iteration. Hence, it consumes significant computational time. Further, it is difficult to apply this method to the dynamic analysis of a rotor. This method has its own limitations and should be used only when the spline coupling is fully investigated.
The meshing force is the force generated by a misaligned spline coupling. It is related to the spline thickness and the transmitting torque of the rotor. The meshing force is also related to the dynamic vibration displacement. The result obtained from the meshing force analysis is given in Figures 7, 8, and 9.
The analysis presented in this paper aims to investigate the stiffness of spline couplings with a misaligned spline. Although the results of previous studies were accurate, some issues remained. For example, the misalignment of the spline may cause contact damages. The aim of this article is to investigate the problems associated with misaligned spline couplings and propose an analytical approach for estimating the contact pressure in a spline connection. We also compare our results to those obtained by pure numerical approaches.


To determine the centering force, the effective pressure angle must be known. Using the effective pressure angle, the centering force is calculated based on the maximum axial and radial loads and updated Dudley misalignment factors. The centering force is the maximum axial force that can be transmitted by friction. Several published misalignment factors are also included in the calculation. A new method is presented in this paper that considers the cam effect in the normal force.
In this new method, the stiffness along the spline joint can be integrated to obtain a global stiffness that is applicable to torsional vibration analysis. The stiffness of bearings can also be calculated at given levels of misalignment, allowing for accurate estimation of bearing dimensions. It is advisable to check the stiffness of bearings at all times to ensure that they are properly sized and aligned.
A misalignment in a spline coupling can result in wear or even failure. This is caused by an incorrectly aligned pitch profile. This problem is often overlooked, as the teeth are in contact throughout the involute profile. This causes the load to not be evenly distributed along the contact line. Consequently, it is important to consider the effect of misalignment on the contact force on the teeth of the spline coupling.
The centre of the male spline in Figure 2 is superposed on the female spline. The alignment meshing distances are also identical. Hence, the meshing force curves will change according to the dynamic vibration displacement. It is necessary to know the parameters of a spline coupling before implementing it. In this paper, the model for misalignment is presented for spline couplings and the related parameters.
Using a self-made spline coupling test rig, the effects of misalignment on a spline coupling are studied. In contrast to the typical spline coupling, misalignment in a spline coupling causes fretting wear at a specific position on the tooth surface. This is a leading cause of failure in these types of couplings.

Wear and fatigue failure

The failure of a spline coupling due to wear and fatigue is determined by the first occurrence of tooth wear and shaft misalignment. Standard design methods do not account for wear damage and assess the fatigue life with big approximations. Experimental investigations have been conducted to assess wear and fatigue damage in spline couplings. The tests were conducted on a dedicated test rig and special device connected to a standard fatigue machine. The working parameters such as torque, misalignment angle, and axial distance have been varied in order to measure fatigue damage. Over dimensioning has also been assessed.
During fatigue and wear, mechanical sliding takes place between the external and internal splines and results in catastrophic failure. The lack of literature on the wear and fatigue of spline couplings in aero-engines may be due to the lack of data on the coupling’s application. Wear and fatigue failure in splines depends on a number of factors, including the material pair, geometry, and lubrication conditions.
The analysis of spline couplings shows that over-dimensioning is common and leads to different damages in the system. Some of the major damages are wear, fretting, corrosion, and teeth fatigue. Noise problems have also been observed in industrial settings. However, it is difficult to evaluate the contact behavior of spline couplings, and numerical simulations are often hampered by the use of specific codes and the boundary element method.
The failure of a spline gear coupling was caused by fatigue, and the fracture initiated at the bottom corner radius of the keyway. The keyway and splines had been overloaded beyond their yield strength, and significant yielding was observed in the spline gear teeth. A fracture ring of non-standard alloy steel exhibited a sharp corner radius, which was a significant stress raiser.
Several components were studied to determine their life span. These components include the spline shaft, the sealing bolt, and the graphite ring. Each of these components has its own set of design parameters. However, there are similarities in the distributions of these components. Wear and fatigue failure of spline couplings can be attributed to a combination of the 3 factors. A failure mode is often defined as a non-linear distribution of stresses and strains.

China Hot selling Professional Micro Knurling Stainless Steel High Tolerance Electric Motor Fan Shaft by CNC Turning     near me factory China Hot selling Professional Micro Knurling Stainless Steel High Tolerance Electric Motor Fan Shaft by CNC Turning     near me factory

China wholesaler Small Electric Motor Winding Machine Stator Coil Winding Machine with Free Design Custom

Product Description

1.Motor coil winding machine application

The semi automatic motor coil winding machine is suitable for fan motor, table fan motor ,washing machine motor and various small motors, square, round and multi-layer motor coil.

As an excellent manufacturer and supplier of motor manufacturing machines, CZPT Mechanical can provide professional motor manufacturing equipment and motor manufacturing technology consulting services.


2. Motor coil winding machine technical data:


Product name:  semi automatic motor coil winding machine for fan motor and washing machine motor
Machine color:  RAL7035(or as per customer’s requirement)
Diameter of Wire:   0.5-1.5mm;
Swing diameter: 500mm;
Winding former Diameter: Max.350mm
Turn No. accuracy: 0.2%;
Wire feeding head:   1-4pc
Transfer distance:  170-300mm
Array wire number: 1-12;
Working speed(no-load): 0-800(according to different diameter wire, the speed is stepless adjustable,no obvious vibration or noise;)
Max rotation speed:  1600R.P.M
Machine productivity:  around 1000 pcs/8 hours
Power / Input:  220V/50Hz
Air pressure:  0.5-0.8MPa
Power:  0.75KW
Main motor power: 2.2KW-6P;
Frequency converter: 2.2KW;
Effective length of the square spindle:  520mm.;
Dimension of square spindle: 20*20*625mm;
Machine Dimension:  1550mm × 1250mm × 1450mm
Machine Weight:  ≈ 850kg


3. Motor coil winding machine characteristics

Automatic slotting, automatic tapping, the operator only needs to put in and pick up the winding mold, and takes the wound coils out of the mold .

with 2 winding square axle spindle;

low vibration and low noise ;

No broken or enamel damage for the wire;

Main electric parts and bearing adapts high quality motor parts;

The turn No., wire dia., wire arraying width, transfer distance, winding direction and wire arraying direction are all settable on the controller;

Wire array: stepping motor + screw rod;

Total 999 model parameter can be set;

Machine will automatically stop once wire coil winding is finished;


4. Motor coil winding machine picture show:

a.The semi auto motor coil winding machine

b. The semi auto motor coil winding machine mold

c. The semi auto motor coil winding machine winding process

d. The semi auto motor coil winding machine wire frame

With good service, unique philosophy, professional team and reliable quality, we win the worldwide customers’ confidence gradually. We directly and indirectly supply our products to more than 50 countries .

Customerized service 1. Customized product design and manufacturing
2. Customized trHangZhou
3.Technical suggestions
After-sales service 1. Warranty Period: 12 month usually
2. Overseas service center available

3. Engineers available to service overseas

Established in 2007, CZPT is a company devoted in the field of electric motors manufacturing, providing one-stop service for its customers.

NIDE has 3 main business divisions.
The first division is to provide different kinds of motor manufacturing machines, it is our Main business, including stand along machine, fully-auto complete line for armature and stator production, and the motor assembly line.
The second division is to supply the full range of motor components such as commutator, ball bearing, carbon brush, insulation paper, shaft, magnet, fan, motor cover, etc.
The third division is to provide technical support and consulting, project support and turn-key service for some motor manufacturing

The Functions of Splined Shaft Bearings

Splined shafts are the most common types of bearings for machine tools. They are made of a wide variety of materials, including metals and non-metals such as Delrin and nylon. They are often fabricated to reduce deflection. The tooth profile will become deformed with time, as the shaft is used over a long period of time. Splined shafts are available in a huge range of materials and lengths.


Splined shafts are used in a variety of applications and industries. They are an effective anti-rotational device, as well as a reliable means of transmitting torque. Other types of shafts are available, including key shafts, but splines are the most convenient for transmitting torque. The following article discusses the functions of splines and why they are a superior choice. Listed below are a few examples of applications and industries in which splines are used.
Splined shafts can be of several styles, depending on the application and mechanical system in question. The differences between splined shaft styles include the design of teeth, overall strength, transfer of rotational concentricity, sliding ability, and misalignment tolerance. Listed below are a few examples of splines, as well as some of their benefits. The difference between these styles is not mutually exclusive; instead, each style has a distinct set of pros and cons.
A splined shaft is a cylindrical shaft with teeth or ridges that correspond to a specific angular position. This allows a shaft to transfer torque while maintaining angular correspondence between tracks. A splined shaft is defined as a cylindrical member with several grooves cut into its circumference. These grooves are equally spaced around the shaft and form a series of projecting keys. These features give the shaft a rounded appearance and allow it to fit perfectly into a grooved cylindrical member.
While the most common applications of splines are for shortening or extending shafts, they can also be used to secure mechanical assemblies. An “involute spline” spline has a groove that is wider than its counterparts. The result is that a splined shaft will resist separation during operation. They are an ideal choice for applications where deflection is an issue.
A spline shaft’s radial torsion load distribution is equally distributed, unless a bevel gear is used. The radial torsion load is evenly distributed and will not exert significant load concentration. If the spline couplings are not aligned correctly, the spline connection can fail quickly, causing significant fretting fatigue and wear. A couple of papers discuss this issue in more detail.


There are many different types of splined shafts. Each type features an evenly spaced helix of grooves on its outer surface. These grooves are either parallel or involute. Their shape allows them to be paired with gears and interchange rotary and linear motion. Splines are often cold-rolled or cut. The latter has increased strength compared to cut spines. These types of shafts are commonly used in applications requiring high strength, accuracy, and smoothness.
Another difference between internal and external splined shafts lies in the manufacturing process. The former is made of wood, while the latter is made of steel or a metal alloy. The process of manufacturing splined shafts involves cutting furrows into the surface of the material. Both processes are expensive and require expert skill. The main advantage of splined shafts is their adaptability to a wide range of applications.
In general, splined shafts are used in machinery where the rotation is transferred to an internal splined member. This member can be a gear or some other rotary device. These types of shafts are often packaged together as a hub assembly. Cleaning and lubricating are essential to the life of these components. If you’re using them on a daily basis, you’ll want to make sure to regularly inspect them.
Crowned splines are usually involute. The teeth of these splines form a spiral pattern. They are used for smaller diameter shafts because they add strength. Involute splines are also used on instrument drives and valve shafts. Serration standards are found in the SAE. Both kinds of splines can also contain a ball bearing for high torque. The difference between the 2 types of splines is the number of teeth on the shaft.
Internal splines have many advantages over external ones. For example, an internal spline shaft can be made using a grinding wheel instead of a CNC machine. It also uses a more accurate and economical process. Furthermore, it allows for a shorter manufacturing cycle, which is essential when splining high-speed machines. In addition, it stabilizes the relative phase between the spline and thread.

Manufacturing methods

There are several methods used to fabricate a splined shaft. Key and splined shafts are constructed from 2 separate parts that are shaped in a synchronized manner to transfer torque uniformly. Hot rolling is 1 method, while cold rolling utilizes low temperatures to form metal. Both methods enhance mechanical properties, surface finishes, and precision. The advantage of cold rolling is its cost-effectiveness.
Cold forming is 1 method, as well as machining and assembling. Cold forming is a unique process that allows the spline to be shaped to the desired shape. The resulting shape provides maximum contact area and torsional strength. Standard splines are available in standard sizes, but custom lengths can also be ordered. CZPT offers various auxiliary equipment, such as mating sleeves and flanged bushings.
Cold forging is another method. This method produces long splined shafts that are used in automobile propellers. After the spline portion is cut out, it is worked on in a hobbing machine. Work hardening enhances the root strength of the splined portion. It can be used for bearings, gears, and other mechanical components. Listed below are the manufacturing methods for splined shafts.
Parallel splines are the simplest of the splined shaft manufacturing methods. Parallel splines are usually welded to shafts, while involute splines are made of metal or non-metals. Splines are available in a wide variety of lengths and materials. The process is usually accompanied by a process called milling. The workpiece rotates to produce the serrated surface.
Splines are internal or external grooves in a splined shaft. They work in combination with keyways to transfer torque. Male and female splines are used in gears. Female and male splines correspond to 1 another to ensure proper angular correspondence. Involute splines have more surface area and thus are stronger than external splines. Moreover, they help the shaft fit into a grooved cylindrical member without misalignment.
A variety of other methods of manufacturing a splined shaft can be used to produce a splined shaft. Spline shafts can be produced using broaching and shaping, 2 precision machining methods. Broaching uses a metal tool with successively larger teeth to remove metal and create ridges and holes in the surface of a material. However, this process is expensive and requires special expertise.


The splined shaft is a mechanical component with a helix-like shape formed by the equal spacing of grooves in a circular ring. The splines can either have parallel or involute sides. The splines minimize stress concentration in stationary joints and can be used in both rotary and linear motion. In some cases, splines are rolled rather than cut. The latter is more durable than cut splines and is often used in applications requiring high strength, accuracy, and smooth finish.
Splined shafts are commonly made of carbon steel. This alloy steel has a low carbon content, making it easy to work with. Carbon steel is a great choice for splines because it is malleable. Generally, high-quality carbon steel provides a consistent motion. Steel alloys are also available that contain nickel, chromium, copper, and other metals. If you’re unsure of the right material for your application, you can consult a spline chart.
Splines are a versatile mechanical component. They are easy to cut and fit. Splines can be internal or external, with teeth positioned at equal intervals on both sides of the shaft. This allows the shaft to engage with the hub around the entire circumference of the hub. It also increases load capacity by creating a constant multiple-tooth point of contact with the hub. For this reason, they’re used extensively in rotary and linear motion.
Splined shafts are used in a wide variety of industries. CZPT Inc. offers custom and standard splined shafts for a variety of applications. When choosing a splined shaft for a specific application, consider the surrounding mated components, torque requirements, and size requirements. These 3 factors will make it the ideal choice for your rotary equipment. And you’ll be pleased with the end result!
There are many types of splines and their applications are endless. They transfer torque and angular misalignment between parts, and they also enable the axial rotation of assembled components. Therefore, splines are an essential component of machinery and are used in a wide range of applications. This type of shaft can be found in various types of machines, from household appliances to industrial machinery. So, the next time you’re looking for a splined shaft, make sure you look for a splined one.

China wholesaler Small Electric Motor Winding Machine Stator Coil Winding Machine     with Free Design CustomChina wholesaler Small Electric Motor Winding Machine Stator Coil Winding Machine     with Free Design Custom

China Standard Angular Contact Ball Bearings Qj313q1/S0 71905CTA Qjf228m Qj1034n2q1/S0 Qj314m 71906CTA Qjf236m Qj1036m Qj315m/C9 71907CTA for High Frequency Electric Motor wholesaler

Product Description

Angular Contact Ball Bearings QJ313Q1/S0 71905CTA QJF228M QJ1034N2Q1/S0 QJ314M 71906CTA QJF236M QJ1036M QJ315M/C9 71907CTA for High Frequency Electric Motor

Bearing Description

Introduction to angular contact ball bearing

1) Angular contact ball bearing is especially suitable to be subjected to the combination of radial and axial load compared with other types of ball bearings. The bigger the contact angle is, the higher axial load withstanding ability it has.

2) The high precision and high speed angular contact ball bearings usually adopts 15°angle.

3)The angular contact ball bearing could be divided into 2 types according to the quantity of roller rows, that are single row and double rows angular contact ball bearings.

4) Conventionally, there are 3 assembly ways for the angular contact bearings, back to back type(i.e 7000/DB) ,face to face type(i.e 70000DF) and series assembly type(i.e 70000/DT).

5) Applications such as lathe main axle, high frequency motor, food machinery,oil pump, fan and blower, and others are recommended to use the angular contact ball bearings, either single row or double rows type.

Bearing Specification

Specification for 7200/7300 series Single Row Angular Contact Ball Bearings

Single Row Angular Contact Ball Bearing Single Row Angular Contact Ball Bearing(Sealed)
Boundary Dimension(mm) Bearing No. Basic load rating Speed rating Weight
d D B B1 r(min) dynamic(Cr) static(Cor) (grease) (oil) kg
10 30 9 0.6 0.3 7200B 4900 2480 15000 22000 0.03
10 30 9 0.6 0.3 7200B 2RS 4900 2480 15000   0.03
12 32 10 0.6 0.3 7201B 6200 2900 14500 20000 0.035
12 32 10 0.6 0.3 7201B 2RS 6200 2900 14500   0.035
12 37 12 0.6 0.3 7301B 8400 3500 13500 18700 0.06
15 35 11 0.6 0.3 7202B 7300 3700 13500 17800 0.043
15 35 11 0.6 0.3 7202B 2RS 7300 3700 13500   0.043
15 42 13 1 0.6 7302B 10500 5200 11900 16000 0.08
17 40 12 0.6 0.3 7203B 8700 4800 11900 16000 0.062
17 40 12 0.6 0.3 7203B 2RS 8700 4800 11900   0.062
17 47 14 1 0.6 7303B 12400 7040 11000 15000 0.11
17 47 14 1 0.6 7303B 2RS 12400 7040 11000   0.11
20 47 14 1 0.6 7204B 12000 6900 11000 15000 0.11
20 47 14 1 0.6 7204B 2RS 12000 6900 11000   0.11
20 52 15 1 0.6 7304B 15200 8400 9300 12700 0.14
20 52 15 1 0.6 7304B 2RS 15200 8400 9300   0.14
25 52 15 1 0.6 7205B 13900 8300 8000 11900 0.13
25 52 15 1 0.6 7205B 2RS 13900 8300 8000   0.13
25 62 17 1.1 0.6 7305B 23000 13300 7200 15710 0.3
25 62 17 1.1 0.6 7305B 2RS 23000 13300 7200   0.3
30 62 16 1 0.6 7206B 18000 12000 7200 15710 0.21
30 62 16 1 0.6 7206B 2RS 18000 12000 7200   0.21
30 72 19 1.1 0.6 7306B 27200 16800 6300 8500 0.37
35 72 17 1.1 0.6 7207B 23700 16500 6300 8500 0.3
35 80 21 1.5 0.6 7307B 33600 21500 5900 8000 0.51
40 80 18 1.1 0.6 7208B 30900 20600 5600 7600 0.39
40 90 23 1.5 0.6 7308B 40600 26800 5300 7200 0.67
45 85 19 1.1 0.6 7209B 31600 23000 5300 8100 0.44
45 100 25 1.5 0.6 7309B 52300 35000 5100 7200 0.9
50 90 20 1.1 0.6 7210B 33000 25500 4700 6300 0.49
50 110 27 2 0.6 7310B 60000 42200 4200 5600 1.15
55 100 21 1.5 0.6 7211B 40600 31600 4500 5900 0.65
55 120 29 2 1 7311B 69300 49700 3800 5100 1.45
60 110 22 1.5 0.6 7212B 49200 39100 4000 5300 0.84
65 120 23 1.5 0.6 7213B 55000 46800 3600 4700 1.05

Bearing Detailed Pictures

Angular Contact Ball Bearing 7014AC P6 Manufactured by CZPT Bearing

About ZheJiang CZPT Bearing

Guomai Bearing Factory Introduction

ZheJiang CZPT Bearing Co.,Ltd(hereinafter referred to as Guomai) was established in 1999, with more than 20 years of bearing research and manufacturing experience. The factory covers an area of 16000 m2,7000 mof which is manufacturing area and the other is office and warehouse. CZPT has large stock for normally used bearing models and this enables us to deliver the bearing to customers within the shortest time.

There are total 160 staffs, 6 automatic bearing assembly lines,116 CNC machines and 22 sets of precise inspection instruments. We not only have our own R&D team but also cooperate with ZheJiang University of Science and Technology, HangZhou Bearing Research Institute to develop new bearing designing and manufacturing technology.
In addition to conventional bearings, CZPT also provides OEM and OM service to our respectable customers to meet their individual requirements.We introduced advanced milling, turning machines, heat treatment equipment and bearing testing machines to guarantee the quality of the bearings because we know “Quality is the life of Guomai” .Now our top products include taper roller bearing, angular contact ball bearing, deep groove bearing ,spherical bearing and cylindrical roller bearing with P5, P4 accuracy grade.

After so many years of developing, CZPT has built up an excellent sales network within China. Our 2 bearing brands “CVZ” and “Bentu” are well known and have high reputation within the industrial equipment and components field. Moreover, with confidence of our bearing quality, we started to export our bearings 4 years ago. Customers from Europe, North America, Middle East, Southeast Asia and Africa have enjoyed the happiness our bearings brought to them.

Guomai Bearing always upholds “WIN-WIN” spirit and believes in “Details determine success” philosophy, and keep improving bearing quality in the past 20 years.  Some series of our bearings have similar quality with SK F, NSK, Timken, NACHI, KOYO, CZPT and other world famous brands but with lower price.
Looking to the future, CZPT will insist on the technology innovation and processing levels to provide the most appropriate bearing products and service to our customers.

Bearing web page description and models may be limited, please contact us for more information.


Guomai Featured Bearings

Featured Bearings

International Trade Show


Reasons to Choose Us ?

Reasons to choose CZPT Bearings as your Chinese Good Performance Angular Contact Ball Bearing partner

1. Bearing designing: Guomai has our own bearing R&D team and adopts Germany technology. This enables us to provide OEM and ODM service to you.
2. Production process: We strictly follow the 5S production process and acquired ISO9001:2008 quality management system certificate. Besides, we introduced from abroad world famous brands lathes and heat treatment equipment, this enables us to provide high precision bearings with similar quality to world famous brands such as SK F,TIMKEN,NSK,NTN,KOYO,NACHI and so on.
3. Materials: To ensure the high quality of bearings, we use high carbon chrome bearing steel which provides high rigidity, and high resistance to CZPT wear to produce the bearings. Low carbon cold rolled steel and low carbon stainless steel is also used according to customers’ requirements.
4. Quality inspection: All bearings will be strictly tested before packing. We have CZPT talysurf, hardness meter,clearance detector,vibration(speed) measuring instrument,roundness instrument to guarantee all bearings are qualified with the standards.
5. Lubricants: Suitable lubricants are used to protect the bearings from oxidation or corrosion of parts thus enable our bearings with longer lifetime, low noise and better high temperature performance. Selection of lubricants is generally governed by the bearing application. Right choice of high quality lubricants could prevent metal to metal contact and conduct heat away from the bearings.
6. Packing: Guomai bearings pay attention to every detail in the bearing production process. We adopt plastic bag, Kraft paper, thick paper box and cartons to protect the bearings from unexpectable damage during the transportation and warehouse stock.
7. Factory direct marketing: We are the factory and not the distributor or trading agent, so we could provide the same quality with competitive price.

Packaging & Shipping

Guomai Bearings, Roll Together with the World and You!!!

Applications of Spline Couplings

A spline coupling is a highly effective means of connecting 2 or more components. These types of couplings are very efficient, as they combine linear motion with rotation, and their efficiency makes them a desirable choice in numerous applications. Read on to learn more about the main characteristics and applications of spline couplings. You will also be able to determine the predicted operation and wear. You can easily design your own couplings by following the steps outlined below.

Optimal design

The spline coupling plays an important role in transmitting torque. It consists of a hub and a shaft with splines that are in surface contact without relative motion. Because they are connected, their angular velocity is the same. The splines can be designed with any profile that minimizes friction. Because they are in contact with each other, the load is not evenly distributed, concentrating on a small area, which can deform the hub surface.
Optimal spline coupling design takes into account several factors, including weight, material characteristics, and performance requirements. In the aeronautics industry, weight is an important design factor. S.A.E. and ANSI tables do not account for weight when calculating the performance requirements of spline couplings. Another critical factor is space. Spline couplings may need to fit in tight spaces, or they may be subject to other configuration constraints.
Optimal design of spline couplers may be characterized by an odd number of teeth. However, this is not always the case. If the external spline’s outer diameter exceeds a certain threshold, the optimal spline coupling model may not be an optimal choice for this application. To optimize a spline coupling for a specific application, the user may need to consider the sizing method that is most appropriate for their application.
Once a design is generated, the next step is to test the resulting spline coupling. The system must check for any design constraints and validate that it can be produced using modern manufacturing techniques. The resulting spline coupling model is then exported to an optimisation tool for further analysis. The method enables a designer to easily manipulate the design of a spline coupling and reduce its weight.
The spline coupling model 20 includes the major structural features of a spline coupling. A product model software program 10 stores default values for each of the spline coupling’s specifications. The resulting spline model is then calculated in accordance with the algorithm used in the present invention. The software allows the designer to enter the spline coupling’s radii, thickness, and orientation.


An important aspect of aero-engine splines is the load distribution among the teeth. The researchers have performed experimental tests and have analyzed the effect of lubrication conditions on the coupling behavior. Then, they devised a theoretical model using a Ruiz parameter to simulate the actual working conditions of spline couplings. This model explains the wear damage caused by the spline couplings by considering the influence of friction, misalignment, and other conditions that are relevant to the splines’ performance.
In order to design a spline coupling, the user first inputs the design criteria for sizing load carrying sections, including the external spline 40 of the spline coupling model 30. Then, the user specifies torque margin performance requirement specifications, such as the yield limit, plastic buckling, and creep buckling. The software program then automatically calculates the size and configuration of the load carrying sections and the shaft. These specifications are then entered into the model software program 10 as specification values.
Various spline coupling configuration specifications are input on the GUI screen 80. The software program 10 then generates a spline coupling model by storing default values for the various specifications. The user then can manipulate the spline coupling model by modifying its various specifications. The final result will be a computer-aided design that enables designers to optimize spline couplings based on their performance and design specifications.
The spline coupling model software program continually evaluates the validity of spline coupling models for a particular application. For example, if a user enters a data value signal corresponding to a parameter signal, the software compares the value of the signal entered to the corresponding value in the knowledge base. If the values are outside the specifications, a warning message is displayed. Once this comparison is completed, the spline coupling model software program outputs a report with the results.
Various spline coupling design factors include weight, material properties, and performance requirements. Weight is 1 of the most important design factors, particularly in the aeronautics field. ANSI and S.A.E. tables do not consider these factors when calculating the load characteristics of spline couplings. Other design requirements may also restrict the configuration of a spline coupling.


Spline couplings are a type of mechanical joint that connects 2 rotating shafts. Its 2 parts engage teeth that transfer load. Although splines are commonly over-dimensioned, they are still prone to fatigue and static behavior. These properties also make them prone to wear and tear. Therefore, proper design and selection are vital to minimize wear and tear on splines. There are many applications of spline couplings.
A key design is based on the size of the shaft being joined. This allows for the proper spacing of the keys. A novel method of hobbing allows for the formation of tapered bases without interference, and the root of the keys is concentric with the axis. These features enable for high production rates. Various applications of spline couplings can be found in various industries. To learn more, read on.
FE based methodology can predict the wear rate of spline couplings by including the evolution of the coefficient of friction. This method can predict fretting wear from simple round-on-flat geometry, and has been calibrated with experimental data. The predicted wear rate is reasonable compared to the experimental data. Friction evolution in spline couplings depends on the spline geometry. It is also crucial to consider the lubrication condition of the splines.
Using a spline coupling reduces backlash and ensures proper alignment of mated components. The shaft’s splined tooth form transfers rotation from the splined shaft to the internal splined member, which may be a gear or other rotary device. A spline coupling’s root strength and torque requirements determine the type of spline coupling that should be used.
The spline root is usually flat and has a crown on 1 side. The crowned spline has a symmetrical crown at the centerline of the face-width of the spline. As the spline length decreases toward the ends, the teeth are becoming thinner. The tooth diameter is measured in pitch. This means that the male spline has a flat root and a crowned spline.


Spindle couplings are used in rotating machinery to connect 2 shafts. They are composed of 2 parts with teeth that engage each other and transfer load. Spline couplings are commonly over-dimensioned and are prone to static and fatigue behavior. Wear phenomena are also a common problem with splines. To address these issues, it is essential to understand the behavior and predictability of these couplings.
Dynamic behavior of spline-rotor couplings is often unclear, particularly if the system is not integrated with the rotor. For example, when a misalignment is not present, the main response frequency is 1 X-rotating speed. As the misalignment increases, the system starts to vibrate in complex ways. Furthermore, as the shaft orbits depart from the origin, the magnitudes of all the frequencies increase. Thus, research results are useful in determining proper design and troubleshooting of rotor systems.
The model of misaligned spline couplings can be obtained by analyzing the stress-compression relationships between 2 spline pairs. The meshing force model of splines is a function of the system mass, transmitting torque, and dynamic vibration displacement. This model holds when the dynamic vibration displacement is small. Besides, the CZPT stepping integration method is stable and has high efficiency.
The slip distributions are a function of the state of lubrication, coefficient of friction, and loading cycles. The predicted wear depths are well within the range of measured values. These predictions are based on the slip distributions. The methodology predicts increased wear under lightly lubricated conditions, but not under added lubrication. The lubrication condition and coefficient of friction are the key factors determining the wear behavior of splines.

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