MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
Among the most frequently specified models in the SCS range, the SCS12 shaft collar serves the 12 mm shaft — one of the most common diameters in industrial automation. Whether ball-screw assemblies, linear guide carriages, or compact gearmotors, the 12 mm shaft is a foundational dimension in modern machine building. The SCS12 provides a 4 mm keyway that accepts wider keys capable of transmitting higher torques than the 3 mm keyway of the SCS10.
All three collars — SCS10, SCS12, and SCS13 — share the 30 mm OD and 10 mm face width envelope, enabling design standardisation of the mounting recess across machines using mixed shaft diameters from 10 to 13 mm.
| Parameter | Value | Notes |
|---|---|---|
| Model | SCS12 | Single-split clamp type |
| Bore (d) | 12 mm | Fits Ø12 shafts |
| Outer Diameter (D) | 30 mm | Wall thickness 9.0 mm per side |
| Width (B) | 10 mm | Axial face width |
| Clamping Screw | M4 | Countersunk socket-head cap screw |
| Slit Width (W) | 1.5 mm | Opening gap for shaft insertion |
| Keyway (K) | 4 | Standard; custom keyway on request |
| Material | Aluminium alloy | ~2.7 g/cm³, corrosion resistant |
⭐ Most Specified Mid-Range Bore
12 mm is the dominant shaft size in industrial automation; SCS12 is stocked at highest volume in the series.
🔧 4 mm Keyway, ISO Standard
Wider than SCS10's 3 mm slot; accepts DIN 6885A 4×4 keys for higher-torque drive applications.
◯ Shared Envelope with SCS10/13
30 mm OD × 10 mm wide — same mounting pocket as adjacent series models.
⚡ Bilateral Clamping Technique
Two SCS12 collars flanking a hub replace machined shaft shoulders, cutting lead time in prototype builds.
12 mm is the shaft end size of many ball-screws in CNC machining centres, 3D printers, and laser cutters. An SCS12 at the bearing-support end prevents axial creep of the bearing housing under preload, maintaining positioning accuracy over the machine's service life.
In modular conveyors used in automotive assembly and e-commerce fulfilment, roller drive shafts of 12 mm are connected to zone-control motors via flexible couplings. The SCS12 prevents the coupling from walking off the shaft during reversals and direction changes.
Tool-changer mechanisms on collaborative robots frequently use 12 mm alignment pins and actuator shafts. Positioning an SCS12 as a hard-stop gives the tool-change sequence a repeatable mechanical datum independent of controller software.
The 4 mm keyway is designed to ISO 773 / DIN 6885A for a 4×4 parallel key — handling torque loads from compact servo drives, timing belt drives, and small conveyor roller shafts. Two SCS12 collars deployed as a bilateral clamping pair on either side of a ball-screw nut housing is a widely adopted technique in linear actuator design: it eliminates machined housing shoulders, allows positional fine-tuning after assembly, and provides a reliable axial reaction point for lead-screw thrust load. Contact the EP contacts page for bulk pricing on collar pairs.
A circlip sits in a machined groove and is non-adjustable. The SCS12 is fully repositionable without shaft rework — critical in prototype or frequently reconfigured machinery. It also exerts distributed clamping force rather than a concentrated groove-edge load, reducing shaft fatigue.
The keyway is machined to order. Standard delivery is without keyway. Specify K=4 mm on your purchase order or custom drawing. Standard keyway width tolerance is JS9.
Standard aluminium alloy tolerates water spray and mild detergent. For aggressive CIP chemicals or high-pressure steam, request an anodised or stainless steel variant.
For M4 socket-head cap screws in aluminium: 2.5–3.0 N·m with a calibrated torque wrench. Exceeding 3.5 N·m risks thread strip-out.
MOQ 100 pcs | 4mm keyway available | Custom drawings accepted
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