SCS30 Aluminum Shaft Collar – 30 mm Bore, M6 Screw, OD 55 mm, Industrial Grade
The SCS30 shaft collar crosses into a new performance tier with three simultaneous upgrades: the outer diameter grows to 55 mm, the face width increases to 15 mm, and the clamping screw escalates from M5 to M6. An M6 socket-head cap screw, torqued to specification, generates approximately twice the clamping force of an M5 — a step change in axial retention capability that makes the SCS30 suitable for shafts carrying real industrial loads.
The 8 mm keyway (DIN 6885A 8×7, available to order) combined with M6 clamping force creates a retention system capable of handling the torque and thrust loads of direct-drive conveyor heads, mixer shafts, and heavy linear actuator lead-screws.
Technical Specifications – SCS30
| Parameter | Value | Notes |
|---|---|---|
| Model | SCS30 | Single-split clamp type |
| Bore (d) | 30 mm | Fits Ø30 shafts |
| Outer Diameter (D) | 55 mm | Wall thickness 12.5 mm per side |
| Width (B) | 15 mm | Axial face width |
| Clamping Screw | M6 | Countersunk socket-head cap screw |
| Slit Width (W) | 1.5 mm | Opening gap for shaft insertion |
| Keyway (K) | 8 | Standard; custom keyway on request |
| Material | Aluminium alloy | ~2.7 g/cm³, corrosion resistant |
Design Features and Performance Advantages
▲ M6 Screw: Twice the Grip of M5
Clamping force doubles vs M5 — SCS30 handles real industrial loads where mid-range collars would micro-slip.
📈 15mm Face Width, Lower Contact Stress
Wider face spreads load across more shaft surface — preserves ground shaft finish and reduces fatigue risk at the collar seat.
⚙ 55mm OD, Solid Clamping Wall
12.5mm wall per side at 30mm bore — robust closure geometry even with optional 8mm keyway slot present.
⚡ Industrial Conveyor and Pump Grade
Designed for multi-kW shaft drives where collar slippage means production downtime.
Application Sectors
▶ Mixer and Agitator Shaft Positioning
Industrial mixer shafts in chemical processing, food production, and wastewater treatment plants run at 30 mm in many mid-size impeller designs. An SCS30 with keyway prevents the impeller hub from riding down the shaft under its own weight and hydrodynamic thrust, maintaining designed impeller-to-tank-bottom clearance.
▶ Heavy Linear Actuator Lead-Screw End Support
Heavy-duty electric linear actuators use 30 mm lead or ball-screws in their highest force ratings. The SCS30 at the fixed bearing end provides the mechanical backstop for axial bearing preload and prevents the screw from retreating under maximum compression load.
▶ Industrial Pump Drive Coupling Retention
Centrifugal and gear pump drives commonly use 30 mm motor-side shaft ends. An SCS30 behind the coupling hub prevents shaft walk-off under the combined weight and axial thrust of the pump impeller, eliminating a common failure mode in horizontally mounted pump drives.
Installation and Mounting Notes
The 15 mm face width of the SCS30 is 25% wider than the 12 mm face of mid-range models, distributing clamping pressure over a larger shaft surface and reducing peak surface stress. For precision ground shafts where surface integrity is critical to adjacent bearing running accuracy, the lower contact pressure of a wider collar helps preserve the ground finish over the machine service life. Discuss your specific application with the EP engineering team.
Frequently Asked Questions – SCS30
Why does the M6 screw provide roughly twice the clamping force of M5?
Clamping force scales with bolt preload, which is proportional to the bolt’s stress area and applied torque. M6 has a stress area approximately 84% larger than M5, and its rated torque is higher — the combined effect roughly doubles the bore closure force achievable at maximum screw torque.
What is the recommended tightening torque for the M6 screw in the SCS30?
For M6 socket-head cap screws in aluminium: 8.0–10.0 N·m. Use a calibrated torque wrench and apply a drop of medium-strength thread-locking compound for vibration environments.
Can the SCS30 be used on vertical shafts where gravity assists axial loading?
Yes. The M6 clamping force and optional keyway make the SCS30 well-suited for vertical shaft applications where component weight adds to the axial load on the collar. Specify full torque and weight loading in your technical enquiry for confirmation of adequacy.
What is the maximum shaft rotational speed for the SCS30?
Split-clamp collars should be dynamically balanced for continuous operation above 3,000 rpm. At 30 mm bore with 55 mm OD, balance grinding may be specified for high-speed applications — contact EP for dynamic balance options.
Upgrade to SCS30 for Industrial-Grade Shaft Retention
MOQ 100 pcs | M6 industrial-grade screw | 8mm keyway available