GBC-SCS08 Aluminum Clamp Type Shaft Collar – 8mm Bore
The GBC-SCS08 aluminum clamp-type shaft collar fits 8 mm bore shafts with a 30 mm OD and 10 mm face width. M4 clamping screw delivers solid axial retention for stepper motors, linear rail end-stops, and small conveyor rollers — all without marking the shaft surface.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
8mm Bore Aluminum Clamp Shaft Collar – Standard Small-Frame Automation Component
| Parameter | Value | Note |
|---|---|---|
| SKU / Model | GBC-SCS08 | GBC SCS Series |
| Bore Diameter (d) | 8 mm | Nominal; shaft tolerance h6 recommended |
| Outer Diameter (D) | 30 mm | |
| Face Width (B) | 10 mm | |
| Clamping Screw | M4 socket-head cap screw | Hex key driven |
| Slot Width (W) | 1.5 mm | Allows radial flex for clamping |
| Keyway Width (K) | Not available | Standard: no keyway; optional on request |
| Material | Aluminium alloy | Lightweight, corrosion-resistant |
| Surface | Natural / anodized on request | |
| MOQ | 100 pcs | Custom drawings accepted |
Product Overview
The GBC-SCS08 aluminum clamp-type shaft collar serves as a standard small-frame positioning component for 8 mm shafts across a broad range of light automation and motion-control applications. At 30 mm OD and 10 mm width, it offers a notably wider clamping surface than the 6 mm variant, translating into higher axial retention force for stepper-motor drive shafts, miniature ball-screw end supports, and compact pneumatic-cylinder guide rods. The M4 socket-head screw provides reliable clamping torque up to 2.5 N·m without requiring special tooling, making field installation or replacement straightforward for maintenance engineers.
Key Features
Zero Shaft Damage
The split-clamp mechanism distributes clamping force uniformly around the shaft circumference, eliminating the stress concentrations and surface gouging associated with set-screw designs. Shafts can be reused or repositioned without refurbishment.
Aluminium Alloy Construction
The aluminium alloy body provides an excellent strength-to-weight ratio, reducing rotational inertia in dynamic applications while offering natural corrosion resistance in dry industrial environments.
Dual Function: Axial Stop & Locator
Mount a single collar as an end-stop against a bearing or housing shoulder. Alternatively, sandwich a component between two collars to create an adjustable axial position that can be reconfigured without removing the shaft.
Single-Screw Rapid Installation
One M4 socket-head screw closes the collar gap, providing full clamping force in under 60 seconds. No tapping, no adhesive, no shaft modification required — ideal for field installation and iterative prototyping.
Typical Application Scenarios
Stepper & Servo Motor Shafts
NEMA 17 and NEMA 23 stepper motors frequently ship with 8 mm output shafts. The SCS08 acts as a positive axial stop against bearing housings, preventing shaft pull-out under bidirectional thrust loads in 3D printers, laser engravers, and CNC routers.
Linear Rail Systems
Guide shafts in compact Cartesian XY tables use the SCS08 as end-stop collars, defining the travel range for carriages in PCB drilling and pick-and-place machines without additional machined shoulders.
Small Conveyor Drives
Idler rollers mounted on 8 mm shafts in food-safe conveyor systems use the SCS08 to lock roller positions without tapping the shaft, simplifying sanitation and reconfiguration.
Dimensional Guide
The dimensional drawing above illustrates the three principal measurements: d (bore diameter, 8 mm) defines the shaft fit; D (outer diameter, 30 mm) determines the radial space envelope and clamping surface area; B (face width, 10 mm) sets the axial footprint on the shaft. The slot of width W = 1.5 mm runs the full face width and allows the collar body to flex radially as the clamping screw is tightened. All dimensions follow ISO 286 fits — specify the mating shaft to h6 tolerance for optimal clamping performance.
Custom bore tolerances, OD reductions, alternative slot widths, and surface treatments (hard anodize, black anodize, electroless nickel) are available from GBC. Supply a detailed engineering drawing for quotation.
Model Selection Guide
For shafts narrower than 8 mm, the GBC-SCS06 provides the same 10 mm face width at a reduced 20 mm OD. If your application requires a keyway, consider the GBC-SCS10 (10 mm bore, 3 mm keyway).
| Model | Bore | Position |
|---|---|---|
| GBC-SCS06 | 6mm | ← Smaller |
| GBC-SCS08 | 8 mm | ◀ Current |
| GBC-SCS10 | 10mm | → Larger |
Installation Procedure
- Inspect the shaft: Verify the shaft diameter is within h6 tolerance (8.000 / 7.991 mm) and the surface is clean, degreased, and free of burrs or nicks.
- Position the collar: Slide the GBC-SCS08 onto the shaft to the required axial position. Use a depth gauge or reference stop block to ensure accurate placement before clamping.
- Tighten the clamping screw: Insert the 4 mm hex key and tighten progressively — two or three partial turns, checking position after each turn. Torque M4 screw to 2.0–2.5 N·m. Apply a small drop of medium-strength threadlocker to the screw threads if the collar is subject to cyclic vibration.
- Verify retention: Apply the expected axial load manually and confirm zero movement. For dynamic applications, re-check torque after the first 50 operating cycles as collars may settle slightly during initial clamping.
Frequently Asked Questions
What is the difference between GBC-SCS06 and GBC-SCS08 for the same application?
Can SCS08 be used in food-grade environments?
How do I align two SCS08 collars to sandwich a bearing?
Related Products
Complete your shaft assembly with other components from the GBC range:
- GBC-SCS06 – 6mm bore aluminum clamp shaft collar — the next smaller size for tighter bore requirements
- GBC-SCS10 – 10mm bore aluminum clamp shaft collar — the next larger size for increased axial capacity
- Full GBC Shaft Collar Range — browse all bore sizes from 6 mm to 60 mm in the SCS series
Request a Quote or Technical Support
Minimum order quantity is 100 pcs. Custom bore tolerances, keyway options, surface treatments, and non-standard dimensions are available — supply your engineering drawing for a fast quotation from GBC.
The GBC-SCS08 aluminum clamp-type shaft collar fits 8 mm bore shafts with a 30 mm OD and 10 mm face width. M4 clamping screw delivers solid axial retention for stepper motors, linear rail end-stops, and small conveyor rollers — all without marking the shaft surface.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
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