BOLTTE GB Flexible Shaft Couplings — 20, 25 and 39 mm Outer Diameter
GB flexible shaft couplings for compact encoder, servo and stepper-shaft connections. The aluminum-alloy hubs and flexible polymer element accommodate the model-specific outer diameter, length and bore selections shown in the drawings.
Model selection
- Outer diameters: 20 mm, 25 mm and 39 mm.
- Lengths: 24 mm, 28 mm, 31 mm, 32 mm, 38 mm, 45 mm, 50 mm and 56 mm as listed by model.
- Set-screw pressure orientations are identified as reverse, positive/reverse or positive clamp types.
- Bore choices are model-specific; the selected drawing shows D1 and D2 and the available bore range.
GB flexible couplings: define D1 and D2 explicitly
GB-D20-L24-RP, for example, identifies a size and fastening configuration. It does not specify both finished shaft bores; provide those separately within the chosen model's limits.
| Selection detail | What to check |
|---|---|
| D and L in the model | Check outside diameter and overall length against installation space. |
| RP / PRP / PP configurations | Compare the specified fastening orientation and tool access in the drawing. |
| D1 and D2 | State each shaft-end bore, even when both diameters are the same. |
Can one bore-range selection fit any shaft automatically?
No. A listed range describes available configurations or machining capacity, not a self-adjusting bore. Confirm the required finished dimensions before production.
Related selection references
Compare the drawings and intended function; these references are not a statement of direct interchangeability.
Ordering notes
- State bore D1 and bore D2 in the order notes; the two bores may be different.
- Also state the shaft diameters, whether a through bore or keyed bore is required, and any keyway dimensions.
- Confirm the mating shaft spacing, alignment, speed, torque, clearance, fastening method and operating temperature before installation.
Dimensions in the model drawings are shown in millimetres. Verify the selected model and all interface dimensions against the equipment before use.
Model / configuration / SKU
| Model / configuration | SKU |
|---|---|
| GB-D20-L24-RP | 5080349135157 |
| GB-D20-L28-PRP | 5080349135158 |
| GB-D20-L31-PP | 5080349135159 |
| GB-D25-L28-RP | 5080349135160 |
| GB-D25-L32-PRP | 5080349135161 |
| GB-D25-L38-PP | 5080349135162 |
| GB-D39-L45-RP | 5080349135163 |
| GB-D39-L50-PRP | 5080349135164 |
| GB-D39-L56-PP | 5080349135165 |