G+GD Precision Cross Universal Joint Coupling – High-Precision, Dual-Joint, Customizable

Factory Direct | 40Cr / 42CrMo alloy steel | Single or double joint | 45° angle per joint | H7 precision bore | 304/316 stainless steel option | Black oxide / nickel / zinc / chrome finishes | OEM/ODM/OBM

The Apexcoupling G+GD series is a high-precision cross universal joint coupling engineered for reliable power transmission in demanding industrial applications. Available in single joint (G type) and double joint (GD type) configurations, these couplings are designed to connect two shafts with angular misalignment up to 45° per joint while maintaining smooth, continuous rotation.

Manufactured from 40Cr, 40CrNi, 20CrMo, or 20CrMnVB alloy steel with optional SUS304/SUS316 stainless steel, the G+GD series delivers exceptional strength, wear resistance, and long service life. Featuring H7 precision bore with keyway, hexagon, or square hole options, these couplings offer high transmission efficiency, low noise, and easy maintenance – making them the ideal choice for CNC machine tools, packaging machinery, metallurgical equipment, semiconductor machinery, printing machinery, woodworking equipment, and general automation.

✅ Precision cross joint design – smooth, reliable torque transmission. Single (G) or double (GD) joint – up to 45° per joint. 40Cr/42CrMo alloy steel or 304/316 stainless steel – choose based on your environment. H7 precision bore – high concentricity, accurate shaft fit. Keyway, hexagon, or square hole options – fully customizable. Black oxide, nickel, zinc, or chrome finishes – corrosion protection options. OEM/ODM/OBM support – custom designs available.

Key Technical Specifications

🔧 Custom bores, keyways, hexagon/square holes, materials (304/316 stainless steel), and special finishes available. Contact us with your specifications.

G (Single) vs GD (Double) – Which One Do You Need?

Rule of thumb:

• Use G type (single joint) for applications with constant angular misalignment.

• Use GD type (double joint) for applications requiring parallel offset compensation or smoother motion at higher angles.

💡 Double joint configurations provide smoother power transmission and reduced vibration when both angular and parallel misalignment are present.

Bearing Selection – Pin/Block vs Needle Roller

The G+GD series offers two bearing options to match your speed and load requirements:

⚠️ Note: The torque range listed in the table is for sliding bearing. Needle roller bearing torque capacity is approximately 50% of sliding bearing rating. It is recommended to use the coupling at ≤50% of the maximum rated speed for optimal service life.

Product Structure

1. Two Yokes (Forks) – Precision-machined from 40Cr/42CrMo alloy steel or 304/316 stainless steel.

2. Cross Shaft (Cross Axis) – The central component that transmits torque.

3. Pins, Bushings, and Blocks – Made of high-quality alloy steel (40Cr, 40CrNi, 20CrMo, or 20CrMnVB).

4. Single Joint (G Type) – One pivot point for angular flexibility.

5. Double Joint (GD Type) – Two pivot points for angular + offset flexibility.

💡 How it works: The G+GD series universal joint consists of two yokes connected by a cross-shaped central component. The pin/block or needle roller bearings allow for smooth angular movement while transmitting torque. The single joint (G) compensates for angular misalignment only, while the double joint (GD) accommodates both angular misalignment and parallel offset. The angle between shafts is allowed to change within a limited range according to working needs.

Product Features & Advantages

Applications

• CNC Machine Tools – Feed drives, positioning systems, high-precision motion control

• Packaging Machinery – Conveyors, wrapping machines, carton sealers

• Metallurgical Equipment – Rolling mills, continuous casting lines

• Semiconductor Equipment – Clean room compatible, high precision

• Printing Machinery – Register control, high-speed operation

• Woodworking Machinery – Multi-spindle drills, routers, saws

• Textile Machinery – Spinning, weaving equipment

• Food & Beverage Machinery – Hygienic, reliable drives (with stainless steel option)

• FA Automation – Pick-and-place systems, indexing tables

• General Industrial Machinery – Pumps, mixers, conveyors

Why Choose Apex Coupling for G+GD Universal Joints?

Model Designation – G+GD Series

00CPWD-□□×□□-□□×□□ (Single Joint) or 00CPCD-□□×□□-□□×□□ (Double Joint)

Keyway Option: Add “K” after the shaft diameter.

• Example: 00CPWD-12×31-6K×6K – both bores with keyways

Hexagon Option: Add “F” after the shaft diameter.

• Example: 00CPWD-12×31-6F×6F – both bores with hexagon holes

Square Option: Add “S” after the shaft diameter.

• Example: 00CPWD-12×31-6S×6S – both bores with square holes

FAQ

Q: What is the difference between G type and GD type?
A: G type is a single universal joint – for angular misalignment only. GD type is a double universal joint – allows both angular misalignment and parallel offset, providing smoother motion.

Q: What is the maximum operating angle?
A: Each joint can operate up to 45° limit angle. For continuous operation with built-in bearings, we recommend ≤30°.

Q: What bearing options are available?
A: Pin/block (plain) bearing – up to 1000 RPM, higher torque capacity. Needle roller bearing – up to 4000 RPM, low friction, maintenance-free. Needle bearing torque capacity is approximately 50% of pin/block rating.

Q: What materials are available?
A: Standard is 40Cr, 40CrNi, 20CrMo, or 20CrMnVB alloy steel. We also offer 304 and 316 stainless steel for corrosion-resistant applications.

Q: What is the bore tolerance?
A: Standard finished bore tolerance is H7 for precision shaft fit.

Q: What connection types are available?
A: We offer keyway, hexagon hole, square hole, plain round, internal spline shaft hole, spline shaft, optical shaft + pin hole, optical shaft + keyway, square shaft, hexagonal shaft, and small flange connections.

Q: What are the common applications?
A: CNC machine tools, packaging machinery, metallurgical equipment, semiconductor machinery, printing machinery, woodworking, and general automation.

Q: Can I get a custom coupling?
A: Yes. We offer OEM, ODM, and OBM support – custom bores, materials, finishes, and special designs available.

Q: What is the warranty?
A: 1 Year – quality assured.

Request a Quote

Send us your configuration (G single or GD double), bore size, connection type, material preference, bearing type, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.