G & GD Type Precision Universal Joint Coupling – Direct Replacement for UNCA/UNCW, 42CrMo, H7 Bore

Factory direct | 42CrMo / 40Cr alloy steel | 45° angle per joint | H7 bore | Plain or needle bearing | 4000 RPM max | Keyway/hex/square hole options | OEM/ODM/OBM | Direct replacement for Misumi UNCA/UNCW

The Apexcoupling G and GD series are precision universal joint couplings designed for reliable power transmission between misaligned shafts. Available in single joint (G type) and double joint (GD type) configurations, these couplings are fully interchangeable with Japanese Misumi UNCA and UNCW series – offering the same high quality at factory-direct pricing. Manufactured from high-quality alloy steel (42CrMo, 40Cr, 40CrNi, 20CrMo, or 20CrMnVB) with total hardening treatment for increased fatigue strength, these couplings deliver exceptional durability and precision. With 45° angular capacity per joint, H7 finished bore tolerance, and plain or needle bearing options, the G/GD series is the ideal solution for building material shops, manufacturing plants, machinery repair shops, and construction equipment.

✅ Direct drop-in replacement for Misumi UNCA (single) and UNCW (double) – same dimensions, higher value.

Key Technical Specifications

🔧 Custom bores, keyways, hexagon/square holes, materials (SUS304/SUS316), and connection types available. Contact us with your specifications.

G Type vs GD Type – Which One Do You Need?

Replacement mapping:

• G Type = Direct replacement for Misumi UNCA (single joint)

• GD Type = Direct replacement for Misumi UNCW (double joint)

💡 The G and GD series are dimensionally interchangeable with Misumi UNCA and UNCW couplings – same mounting dimensions, same performance, better value.

Bearing Options

✅ Needle bearing versions (GZ/GDZ) are maintenance-free with lifetime lubrication – ideal for high-speed applications.

Material Options

Customization Options

The G/GD series offers extensive customization:

Product Features & Advantages

Product Structure

1. Two Yokes (Forks) – Precision-machined from high-quality alloy steel (or optional materials).

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

3. Bearing Options – Plain bearing (1000 RPM) or needle bearing (4000 RPM).

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

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

💡 The G and GD series are manufactured to the same dimensional standards as Misumi UNCA/UNCW, ensuring seamless replacement without modification to existing equipment.

Applications

• Building Material Shops – Material handling, conveyors

• Manufacturing Plants – General power transmission

• Machinery Repair Shops – Replacement and upgrade parts

• Construction Equipment – Reliable drives in demanding environments

• General Machinery – All applications requiring angular misalignment compensation

• Food Processing – With SUS304/SUS316 stainless steel option

• Packaging Machinery – Reliable, maintenance-friendly drives

• Textile Machinery – High-speed, precision drives

• Printing Equipment – Register control, smooth operation

Why Choose Apex Coupling for G/GD Universal Joints?

FAQ

Q: What is the difference between G type and GD type?
A: G type is a single universal joint – for angular misalignment only (replaces Misumi UNCA). GD type is a double universal joint – allows both angular misalignment and parallel offset (replaces Misumi UNCW).

Q: Is this a direct replacement for Misumi UNCA/UNCW?
A: Yes. The G and GD series are dimensionally interchangeable with Misumi UNCA and UNCW couplings – same mounting dimensions, same performance, better value.

Q: What is the maximum operating angle?
A: Each joint can operate up to 45° limit angle.

Q: What bearing options are available?
A: Plain bearing (G/GD) – up to 1000 RPM. Needle bearing (GZ/GDZ) – up to 4000 RPM, maintenance-free with lifetime lubrication.

Q: What materials are available?
A: Standard is 42CrMo, 40Cr, 40CrNi, 20CrMo, or 20CrMnVB alloy steel. We also offer SUS304, SUS316, high-strength aluminum alloy, and insulating nylon.

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

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

Q: What is the torque range?
A: The series covers 4.5 – 1500 N·m. Custom higher torque available on request.

Q: What is the surface treatment?
A: Standard is grinding or black oxide (blueing) .

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

Request a Quote

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