Plastic shaft coupling
Shaft couplings manufactured from plastic offer an excellent low cost equivalent to aluminium shaft couplings especially where the torque requirement is lower. This product range offers you a quality range of plastic injection moulded shaft couplings giving high torsional stiffness combined with exceptional durability to shaft misalignment. There are two basic designs called UJ and GJ. Type UJ is for lighter usage and smaller angular and parallel shaft offsets, whilst type GJ, with its two flexible elements, is ideal for medium usage.
Key product advantages;
- RoHs Compliant
- Low cost - High quality
- No maintenance
- Accept parallel and angular shaft misalignment's
- High torsional stiffness
- Accommodate axial compression
- Zero backlash torque transmission
- Provides thermal and electrical insulation between shafts
- Exceptional durability
- Trouble free set screw attachment to shaft
- Large variety of bore combinations 1.5mm to 12.00mm
- Constant velocity torque transmission under shaft offsets
- Low radial loads
- Low inertia
Coupling Type GJ - For higher duty
- Double element design
- Greater angular offset capability
- Higher torque capability
GJ Dimensions
| Type | d1 |
Possible bore combinations d2 |
D |
L |
P |
B |
Metric Cap screw |
Wrench Torque on |
|||||
| GJ | 1.5 |
|
9 | 11 | 8.2 | 3.2 | 2 | 0.08 | |||||
| 1.5 |
|
10 | 12 | 8.4 | 3.2 | 2 | 0.08 | ||||||
| 2 |
|
9 | 13 | 10 | 3.2 | 2 | 0.08 | ||||||
| 3 |
|
12 | 20 | 15 | 5.1 | 3 | 0.15 | ||||||
| 4 |
|
13 | 21 | 15 | 5.3 | 3 | 0.2 | ||||||
| 5 |
|
14 | 21 | 15 | 5.2 | 3 | 0.2 | ||||||
| 6 |
|
15 | 22 | 16 | 5.2 | 3 | 0.25 | ||||||
| 8 |
|
19 | 24 | 17 | 6.8 | 4 | 0.4 | ||||||
| 10 |
|
22 | 26 | 18 | 7.1 | 4 | 0.5 | ||||||
| G2J | 4 |
|
14 | 21 | 16 | 5.3 | 3 | 0.25 | |||||
| 5 |
|
15 | 20.5 | 15 | 5.3 | 3 | 0.25 | ||||||
| 6 |
|
16 | 21 | 16 | 5.5 | 3 | 0.3 | ||||||
| 8 |
|
20 | 24 | 16 | 6.8 | 4 | 0.45 | ||||||
| GJK | 9.53 |
|
25 | 32 | 25 | 7.3 | 4 | 0.65 | |||||
| 10 |
|
25 | 32 | 25 | 7.3 | 4 | 0.65 | ||||||
| 12 |
|
28 | 34 | 27 | 7.5 | 4 | 0.8 | ||||||
| EGJ2 |
|
22 | 22.3 | 16.7 | 5.4 | 4 | 1.2 |
TYPE GJ Performance
| Bore Combination （d1-d2）(mm) |
Rated Torque （Nm） |
Max (rpm) |
Torsional stiffness (Nm/rad) |
Max Parallel offset (mm) |
Max Angular offet (°) |
Max allowable axial movement (mm) |
Inertia (kg・m2) |
Weight (g) |
Material | |
| GJ | 1.5-1.5 | 0.18 | 4,000 | 1.8 | 0.2 | 3 | ±0.3 | 1.0×10-8 | 0.9 | Glass fibre reinforced PBT resin GFPBT |
| 1.5-2 | ||||||||||
| 1.5-2.5 | 0.22 | 4,000 | 2 | 0.2 | 3 | ±0.3 | 1.4×10-8 | 1.1 | ||
| 1.5-3 | ||||||||||
| 2-2 | 0.18 | 4,000 | 1.5 | 0.3 | 4 | ±0.3 | 1.0×10-8 | 1 | ||
| 3-3 | 0.4 | 4,000 | 4 | 0.4 | 5 | ±0.3 | 4.5×10-8 | 2.5 | ||
| 4-4 | 0.6 | 4,000 | 6 | 0.4 | 5 | ±0.4 | 7.0×10-8 | 3.1 | ||
| 5-5 | 0.7 | 5,000 | 8 | 0.5 | 5 | ±0.4 | 9.0×10-8 | 3.3 | ||
| 6-6 | 0.8 | 6,000 | 10 | 0.5 | 5 | ±0.4 | 1.2×10-7 | 3.9 | ||
| 8-8 | 1.5 | 8,000 | 20 | 0.5 | 5 | ±0.4 | 3.9×10-7 | 7.3 | ||
| 10-10 | 2 | 10,000 | 32 | 0.5 | 5 | ±0.4 | 7.0×10-7 | 10 | ||
| G2J | 4-d2 | 0.8 | 5,000 | 10 | 0.4 | 5 | ±0.4 | 8.0×10-8 | 3.4 | |
| 5-d2 | 0.9 | 6,000 | 12 | 0.4 | 5 | ±0.4 | 1.0×10-7 | 4 | ||
| 6-d2 | 1 | 6,000 | 16 | 0.5 | 5 | ±0.4 | 1.3×10-7 | 4.5 | ||
| 8-d2 | 1.7 | 8,000 | 28 | 0.5 | 5 | ±0.4 | 4.0×10-7 | 7.5 | ||
| GJK | 9.53-9.53 | 3 | 10,000 | 35 | 0.5 | 4 | ±0.4 | 1.3×10-6 | 15 | |
| 10-10 | ||||||||||
| 12-12 | 3.6 | 12,000 | 40 | 0.5 | 4 | ±0.4 | 2.1×10-6 | 19 | ||
| EGJ2 | 3mm up to 8mm | 0.8 | 12,000 | 23 | 0.8 | 7 | ±0.7 | 4.0×10-7 | 13 | Polyacetal with Brass insert for bore |
- Optimum operating temperature ：Polyacetal -20°C〜60°C (GFPBT：-30°C〜85°C)
- Please note that half the allowable torque is possible at the maximum allowable temperature.
Coupling type UJ - For lower duty
- Type UJ is for lighter usage and smaller angular and parallel shaft offsets.
- Single element design
- Lower duty rated
- Low inertia
Type UJ Dimensions
| Type | d1 |
Possible bore cominations d2 |
D |
L |
P |
B |
Metric Cap screw |
Wrench torque on cap screw（Nm） |
|||||
| UJ | 2 |
|
8 | 9 | 5.8 | 3.2 | 2 | 0.05 | |||||
| 2.5 |
|
12 | 15 | 9.2 | 5.3 | 3 | 0.18 | ||||||
| 3 |
|
12 | 15 | 9.2 | 5.3 | 3 | 0.18 | ||||||
| 3.2 |
|
12 | 15 | 9 | 5.4 | 3 | 0.2 | ||||||
| 4 |
|
14 | 15 | 9.5 | 5 | 3 | 0.2 | ||||||
| 5 |
|
14 | 15 | 9.8 | 5.2 | 3 | 0.2 | ||||||
| 6 |
|
15 | 16 | 9.8 | 5.5 | 3 | 0.2 | ||||||
| 8 |
|
18 | 18 | 13 | 5.5 | 3 | 0.25 |
Type UJ Performance
|
Bore Combination |
Rated Torque |
Max (rpm) |
Torsional stiffness (Nm/rad) |
Max Parallel offset (mm) |
Max Angular offet (°) |
Max allowable axial movement (mm) |
Inertia (kg・m2) |
Weight (g) |
Material | ||
| UJ | 2-2 | 0.15 | 4,000 | 1.8 | 0.05 | 3 | ±0.15 | 0.5×10-8 | 0.7 | ||
| 2.5-3 3-3 |
0.25 | 4,000 | 2 | 0.1 | 4 | ±0.2 | 0.4×10-7 | 2.3 |
P t a l
|
||
| 3.2-3.2A | 0.45 | 4,000 | 6 | 0.1 | 4 | ±0.2 | 0.4×10-7 | 2.2 |
G P B T
|
||
| 4-3 4-4 |
0.5 | 5,000 | 10 | 0.1 | 5 | ±0.3 | 0.6×10-7 | 2.4 | |||
| 5-5 | 0.7 | 5,000 | 8 | 0.1 | 5 | ±0.3 | 0.6×10-7 | 2.7 | |||
| 6-2.4 6-3 |
0.6 | 6,000 | 9 | 0.1 | 5 | ±0.3 | 0.8×10-7 | 3 | |||
| 6-3.2 6-4 6-5 |
0.7 | 6,000 | 10 | 0.1 | 5 | ±0.3 | 0.8×10-7 | 3 | |||
| 6-6 | 0.8 | 6,000 | 10 | 0.1 | 5 | ±0.3 | 0.8×10-7 | 3 | |||
| 8-4 8-5 8-6 8-8 |
1.0 | 6,000 | 16 | 0.2 | 5 | ±0.3 | 2.5×10-7 | 4 | |||
- Optimum operating temperature： Polyacetal -20°C〜60°C、GFPBT：-30°C〜85°C ＊
- Wrench Torque on Cap screw should not exceed the stated figure
- Please note that half the allowable torque is possible at the maximum allowable temperature.
If you require further technical information, please do not hesitate to contact our sales engineers who will be more than happy to help you with your selection. Alternatively scroll down the page for further technical and dimensional information.