SCS16 Aluminum Shaft Collar – 16 mm Bore, OD 35 mm, M5 Screw, Industrial Drive Standard
The SCS16 shaft collar serves the 16 mm shaft diameter — the dominant standard for servo motor output shafts, industrial gearbox outputs, and conveyor drive shafts across Chinese and European manufacturing. With more installed shaft-meters at 16 mm than at almost any other single diameter in domestic industrial machinery, the SCS16 is the highest-volume model in the mid-range of the SCS series.
It completes the 35 mm OD, 12 mm face width, M5 screw bracket alongside the SCS14 and SCS15. At 16 mm bore it maximises the wall-thickness-to-bore ratio available within this housing envelope — giving it the best radial rigidity of the three. The 5 mm keyway directly engages the standard keyway pre-machined on most servo and AC induction motor shafts in this size class.
Technical Specifications – SCS16
| Parameter | Value | Notes |
|---|---|---|
| Model | SCS16 | Single-split clamp type |
| Bore (d) | 16 mm | Fits Ø16 shafts |
| Outer Diameter (D) | 35 mm | Wall thickness 9.5 mm per side |
| Width (B) | 12 mm | Axial face width |
| Clamping Screw | M5 | Countersunk socket-head cap screw |
| Slit Width (W) | 1.5 mm | Opening gap for shaft insertion |
| Keyway (K) | 5 | Standard; custom keyway on request |
| Material | Aluminium alloy | ~2.7 g/cm³, corrosion resistant |
Design Features and Performance Advantages
⭐ Highest-Volume Mid-Range Model
16mm is the most specified servo/drive shaft diameter in domestic industry — SCS16 ships in the largest quantities of any mid-range collar.
⚡ Optimal Wall/Bore Ratio at 35mm OD
At 16mm bore with 35mm OD, wall thickness per side is 9.5mm — best radial rigidity within the shared 35mm housing class.
⚙ Standard Motor Shaft Keyway
5mm keyway matches the DIN 6885A slot pre-machined on most 16mm servo motor output shafts — no additional shaft machining required.
📈 High-Cycle Reliability
M5 split-clamp mechanism maintains axial position across millions of start-stop cycles when correctly torqued.
Application Sectors
▶ Servo and AC Motor Output Shaft Retention
The 16 mm shaft is the output standard for servo motors from 50 W to 400 W in most Asian and European catalogues. An SCS16 fitted behind the coupling hub prevents hub migration without adding significant rotating mass, keeping the servo system inertia ratio within the drive controller's specification.
▶ Industrial Conveyor Drive Shaft Collars
Head pulley shafts on belt conveyors in automotive assembly plants and distribution warehouses frequently run at 16 mm. SCS16 collars at the bearing inboard faces serve as axial shaft retention against belt tension-induced thrust that would otherwise force the shaft to walk axially through the bearing housings over time.
▶ Collaborative and Industrial Robot Wrist Joints
Wrist-axis shafts in collaborative robots with 5–10 kg payload capacity commonly use 16 mm shafts. A precisely positioned SCS16 collar defines the axial datum for the wrist encoder disc, ensuring the encoder-to-magnet gap stays within specification across thousands of cycles.
Installation and Mounting Notes
In servo-driven systems, the SCS16 is most commonly installed as an outboard retainer on the motor shaft, preventing the coupling hub from creeping toward the motor bearing under cumulative thermal expansion and contraction cycles. For high-cycle servo applications (above 10 million start-stop cycles), EP recommends specifying the keyway option and using a DIN 6885A key to supplement the friction clamp. For fleet-scale servo motor collar specifications, contact the EP sales team for volume pricing.
Frequently Asked Questions – SCS16
What clamping torque should I apply to the M5 screw on the SCS16?
For M5 socket-head cap screws in aluminium: 4.0–5.0 N·m. For high-vibration servo environments, apply a drop of medium-strength thread-locking compound before final torque-down.
Does the SCS16 require a keyway to hold position on a servo motor shaft?
For low-speed, high-torque applications, friction alone is typically sufficient. For high-speed servo shafts above 3,000 rpm with frequent direction reversals, the 5 mm keyway provides insurance against cumulative micro-rotation under vibration.
Can I use the SCS16 on a shaft with an existing keyway if I don't want to use the keyway?
Yes. A standard (non-keyway) SCS16 can be fitted over a keyed shaft — the shaft keyway simply aligns with the collar bore and does not interfere with the clamping action.
Are discounts available for high-volume servo motor OEM orders?
Standard MOQ is 100 pieces. OEM volume pricing is available for orders above 1,000 pieces per batch — contact EP's sales team with your annual forecast volume.
Supply Your Servo Shaft Line with SCS16
MOQ 100 pcs | High-volume OEM pricing available | Keyway option on request