Select an EP-SCS shaft clamp from the real shaft and machine interface, not from model name alone. The series identifies bore d, outside diameter D, width B, clamp screw M, split W and keyway K where listed, giving buyers a clear sequence for narrowing the range.
The correct bore is only the first gate. Clearance, screw access, keyed geometry and application duty all affect whether the collar can be installed and serviced in the intended position.
1. Measure the Shaft at the Collar Position
Use the actual shaft diameter as the first selection input, especially on replacement work. If wear, coating buildup or visible surface damage is present, measure carefully at the intended location and note the condition rather than relying only on an old part marking or machine model.
Do not choose a larger or smaller nominal bore to compensate for an uncertain measurement. Clarify the shaft first, because the collar’s clamping action is not a substitute for correct basic fit.
2. Check Outside Diameter and Body Width
Compare D with the radial space around the shaft and B with the available axial space. A collar with the correct bore can still interfere with a carriage, frame, bearing support, coupling, pulley or guard when the machine was designed around a different collar style.
On moving systems, inspect the whole travel path rather than only the final collar position. On guarded equipment, check that the screw can still be reached with the machine assembled.
3. Decide Whether a Keyway Is Required
The standard EP-SCS collar is plain-bore. Keyway K dimensions are listed for most models from EP-SCS10 through EP-SCS60, while EP-SCS06 and EP-SCS08 do not show a standard K value.
A keyed request should be driven by the mating shaft design. Include the shaft keyway and key dimensions so the complete interface can be reviewed; the collar-side K dimension does not define the whole keyed assembly by itself.
4. Compare the Complete EP-SCS Range
| Model | Bore d (mm) | OD D (mm) | Width B (mm) | Screw M | Split W (mm) | Keyway K (mm) |
|---|---|---|---|---|---|---|
| EP-SCS06 | 6 | 20 | 10 | M4 | 1 | — |
| EP-SCS08 | 8 | 30 | 10 | M4 | 1.5 | — |
| EP-SCS10 | 10 | 30 | 10 | M4 | 1.5 | 3 |
| EP-SCS12 | 12 | 30 | 10 | M4 | 1.5 | 4 |
| EP-SCS13 | 13 | 30 | 10 | M4 | 1.5 | 4 |
| EP-SCS14 | 14 | 35 | 12 | M5 | 1.5 | 5 |
| EP-SCS15 | 15 | 35 | 12 | M5 | 1.5 | 5 |
| EP-SCS16 | 16 | 35 | 12 | M5 | 1.5 | 5 |
| EP-SCS18 | 18 | 40 | 12 | M5 | 1.5 | 6 |
| EP-SCS20 | 20 | 40 | 12 | M5 | 1.5 | 6 |
| EP-SCS22 | 22 | 45 | 12 | M5 | 1.5 | 6 |
| EP-SCS25 | 25 | 45 | 12 | M5 | 1.5 | 8 |
| EP-SCS30 | 30 | 55 | 15 | M6 | 1.5 | 8 |
| EP-SCS35 | 35 | 60 | 15 | M6 | 2 | 10 |
| EP-SCS40 | 40 | 70 | 18 | M8 | 2 | 12 |
| EP-SCS45 | 45 | 80 | 22 | M10 | 2 | 14 |
| EP-SCS50 | 50 | 85 | 22 | M10 | 3 | 14 |
| EP-SCS60 | 60 | 95 | 22 | M10 | 3 | 18 |
5. Define What the Collar Is Expected to Do
State whether the collar is a guide-shaft stop, a locator beside another component, a paired axial positioner or a maintenance replacement. If it will see repeated impact, meaningful axial demand or an unusual environment, include that duty in the RFQ instead of assuming bore size alone defines performance.
For application-critical properties such as tightening torque, axial holding requirement, aluminum grade, surface treatment or compliance documentation, list the requirement explicitly so the ordered configuration can be confirmed.
6. Replacement and Retrofit Checklist
- Measured shaft diameter at the intended collar position.
- Existing collar outside diameter and width.
- Available radial/axial space around bearings, guards, carriages, pulleys or couplings.
- Clamp-screw access direction.
- Key/keyway details if applicable.
- Photo or drawing of the existing assembly.
7. RFQ Checklist
Send the model or required bore, actual shaft diameter, quantity, application, keyway requirement and any envelope restrictions. When a standard EP-SCS size does not fit the interface, include a drawing so a non-standard bore or other modification can be reviewed rather than inferred.