10. Material and Structural Options

Apex U Joints can be manufactured using different material combinations according to the application.

Standard Alloy Steel

Common structural materials include:

• 42CrMo
• 40Cr
• 40CrNi
• 20CrMo
• 20CrMnVB

These materials can be selected according to required strength, hardness, wear resistance, and operating conditions.

Stainless Steel

For applications requiring improved corrosion resistance, selected components can be customized using:

• SUS304
• SUS316

Sleeve Options

Depending on the application, sleeves can also be customized using:

• High-strength aluminum alloy
• Insulating nylon

11. Bore and Shaft Customization

One of the major advantages of Apex U Joints is the flexibility of shaft connection design.

Available options include:

Keyway Bore

Suitable for conventional keyed shaft transmission.

Hexagonal Bore

Suitable for compact shaft connections and specialized transmission systems.

Square Bore

Suitable for square-shaft transmission applications.

Spline Connection

Internal spline and external spline configurations can be customized according to customer drawings.

Pin Hole Connection

Optical shaft + pin hole designs are available for specific transmission systems.

Flange Connection

Small flange and customized flange interfaces can be produced according to drawings.

12. How Apex U Joints Work

A universal joint uses a cross-shaped connecting mechanism to transmit torque between two shafts that are not perfectly aligned.

When the driving shaft rotates, the universal joint cross transfers rotational movement through the joint to the driven shaft.

This allows the shafts to operate at an angle while maintaining mechanical power transmission.

For a G-type single universal joint, the design primarily compensates for angular shaft alignment.

For a GD-type double universal joint, two universal-joint elements are arranged together to provide greater flexibility for angular and parallel shaft-offset conditions.

Correct selection of joint angle, shaft speed, torque, bearing type, and installation geometry is essential for long service life.

13. Applications

Apex U Joints are suitable for a wide range of industrial transmission applications.

Machine Tools

• CNC machinery
• Milling machines
• Turning equipment
• Precision machine tools
• Tool positioning systems

Automated Manufacturing

• Robotic machinery
• Automated production lines
• Motion-control equipment
• Mechanical transmission systems

Printing and Packaging

• Printing machinery
• Packaging machines
• Conveyor systems
• Roll transmission systems

Industrial Transmission

• Pumps
• Compressors
• Gear-driven equipment
• Power transmission systems

Other Industries

• Building material machinery
• Manufacturing plants
• Machinery repair
• Food and beverage machinery
• Agricultural machinery
• Construction equipment
• Energy and mining equipment

14. Apex U Joints for Machine Tools

Machine tools often require compact and precise transmission components capable of transmitting torque between shafts at different angles.

Apex U Joints can be configured with:

• Precision bore
• H7 bore tolerance
• Keyway
• Hexagonal bore
• Square bore
• Spline
• Needle bearing
• Customized shaft connections

This makes them suitable for applications where standard shaft couplings cannot easily accommodate the required shaft geometry.

15. Standard Size Range

Apex can supply different universal-joint sizes according to shaft diameter, outer diameter, torque, and operating speed.

Typical specifications include:

Inner hole: 6–50 mm
Outer diameter: 12–93 mm
Nominal torque: 4.5–1500 N·m
Maximum speed: up to 4000 RPM depending on configuration

For applications outside the standard range, Apex can manufacture customized universal joints according to:

• Customer drawings
• Sample parts
• Shaft dimensions
• Torque requirements
• Speed requirements
• Installation dimensions

16. OEM / ODM Custom Universal Joints

Apex supports OEM and ODM manufacturing for industrial universal joints.

Customers can provide:

• 2D drawings
• 3D CAD files
• Samples
• Shaft dimensions
• Bore specifications
• Keyway dimensions
• Spline specifications
• Torque and speed requirements
• Installation drawings

Apex can then develop the corresponding universal joint configuration.

Customizable Parameters

• Material
• Bore
• Shaft diameter
• Overall length
• Outer diameter
• Keyway
• Spline
• Hexagonal hole
• Square hole
• Flange
• Pin connection
• Bearing type
• Heat treatment
• Surface treatment

17. Why Choose Apex U Joints?

Apex Coupling focuses on industrial power transmission components and customized coupling solutions.

With precision machining, OEM/ODM capability, quality control, and multiple material options, Apex can supply universal joints for both standard industrial applications and customized transmission systems.

Apex Advantages

• Industrial universal joint manufacturer
• OEM / ODM support
• 42CrMo and 40Cr material options
• G / GD single and double designs
• Precision bore machining
• Custom keyway / spline / hex / square holes
• Needle-bearing options
• Customized dimensions
• ISO9001 quality system
• RoHS and BV certification support

18. FAQ

What are Apex U Joints?

Apex U Joints are industrial universal joint couplings designed to transmit torque between shafts operating at an angle. They are available in G-type single and GD-type double configurations.

What is the difference between G and GD universal joints?

A G-type universal joint is a single-joint configuration mainly used for angular shaft misalignment. A GD-type universal joint uses a double-joint arrangement and can accommodate more complex shaft geometry when properly configured.

What material are Apex U Joints made from?

Common materials include 42CrMo and 40Cr. 40CrNi, 20CrMo, 20CrMnVB, SUS304, and SUS316 can also be considered for customized applications.

What is the maximum speed of Apex U Joints?

Selected needle-bearing configurations can operate at speeds of up to approximately 4000 RPM, depending on size and operating conditions. Pin-and-block configurations are generally intended for lower-speed applications.

What is the maximum operating angle?

The allowable angle is model- and configuration-dependent. A single universal joint is generally rated for up to 45°, while a suitable double-joint arrangement can provide greater total articulation.

Can the bore be customized?

Yes. Apex can customize keyway, hexagonal, square, spline, pin-hole, flange, and other shaft connection configurations.

Can Apex manufacture universal joints according to drawings?

Yes. Apex supports OEM and ODM manufacturing based on customer drawings, samples, CAD files, shaft dimensions, torque, speed, and installation requirements.

Are Apex U Joints suitable for machine tools?

Yes. Precision universal joints can be used in machine tools, CNC machinery, automated equipment, printing machinery, packaging systems, and other industrial transmission applications.