GBC-SCS12 Aluminum Clamp Type Shaft Collar – 12mm Bore
The GBC-SCS12 aluminum clamp-type shaft collar suits 12 mm bore shafts with a 30 mm OD, 10 mm face width, M4 clamping screw, and standard 4 mm keyway. Purpose-built for ball-screw end supports, collaborative robot joints, and precision actuator assemblies requiring simultaneous axial and rotational locking.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
12mm Bore Aluminum Clamp Shaft Collar with 4mm Keyway – Ball Screw & Robot Joint Positioning
| Parameter | Value | Note |
|---|---|---|
| SKU / Model | GBC-SCS12 | GBC SCS Series |
| Bore Diameter (d) | 12 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) | 4 mm | 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-SCS12 targets the demanding intersection of compact form factor and meaningful torque capacity. With a 12 mm bore, 30 mm OD, and a standard 4 mm keyway channel, this collar delivers dual-function performance: precise axial location and positive rotational locking on the same component. It is particularly suited to ball-screw end-support assemblies where the screw must be axially pre-loaded against angular contact bearings, and to robot joint sub-drives where gearbox output shafts operate in high-cycle-count, bidirectional loading regimes. The 10 mm face width maintains a compact footprint in space-constrained actuator housings, while the M4 clamping screw permits tool-free torque adjustment during commissioning.
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.
Optional Keyway for Torque Locking
A 4 mm keyway channel can be broached on request, enabling the collar to transmit rotational torque in addition to providing axial location — effectively combining two separate components into one.
Typical Application Scenarios
Ball Screw End Supports
Precision ball screws in CNC machining centres and coordinate-measuring machines use the SCS12 as a fixed-end pre-load element. The 4 mm keyway prevents the screw from unwinding under reversal, while the clamp collar sets axial pre-load force by collar position rather than requiring custom machined nuts.
Collaborative Robot Joint Drives
Harmonic-drive and strain-wave gearboxes in 6-DOF collaborative robots route torque through 12 mm cross-roller bearing shafts. The SCS12 collar positions inner rings during zero-backlash assembly and retains them during the high-acceleration duty cycles typical of pick-and-place operations.
Medical Rehabilitation Devices
Motorised orthotic exoskeleton joints operate on 12 mm stainless shafts with strict weight budgets. The aluminium SCS12 — weighing approximately 10 g — satisfies both axial retention and torque-lock requirements while contributing less than 1% of the joint's moving mass.
Dimensional Guide
The dimensional drawing above illustrates the three principal measurements: d (bore diameter, 12 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 a 10 mm shaft with 3 mm keyway, the GBC-SCS10 is the next step down. Stepping up to 13 mm bore, the GBC-SCS13 shares the same 30 mm OD and is preferred for European-standard motor shafts.
| Model | Bore | Position |
|---|---|---|
| GBC-SCS10 | 10mm | ← Smaller |
| GBC-SCS12 | 12 mm | ◀ Current |
| GBC-SCS13 | 13mm | → Larger |
Installation Procedure
- Inspect the shaft: Verify the shaft diameter is within h6 tolerance (12.000 / 11.991 mm) and the surface is clean, degreased, and free of burrs or nicks.
- Position the collar: Slide the GBC-SCS12 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 2.5 N·m. Insert the key before collar installation to confirm zero key-to-keyway radial play. If play exists, the keyway may have been machined oversize — do not compensate with shimming.
- 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
How does the 4mm keyway affect the collar's clamping strength?
Can I use SCS12 on metric shafts to ISO h6 and also on imperial 1/2-inch shafts?
What threadlocker grade is recommended for the M4 screw in a vibration environment?
Related Products
Complete your shaft assembly with other components from the GBC range:
- GBC-SCS10 – 10mm bore aluminum clamp shaft collar — the next smaller size for tighter bore requirements
- GBC-SCS13 – 13mm 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-SCS12 aluminum clamp-type shaft collar suits 12 mm bore shafts with a 30 mm OD, 10 mm face width, M4 clamping screw, and standard 4 mm keyway. Purpose-built for ball-screw end supports, collaborative robot joints, and precision actuator assemblies requiring simultaneous axial and rotational locking.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
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