GBC-SCS16 Aluminum Clamp Type Shaft Collar – 16mm Bore
The GBC-SCS16 aluminum clamp-type shaft collar targets 16 mm bore IEC servo motor shafts and SFU ball-screw fixed ends. OD 35 mm, face width 12 mm, M5 screw, optional 5 mm keyway. Eliminates the shaft fretting and slippage associated with set-screw collars in bidirectional servo drives.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
16mm Bore Aluminum Clamp Shaft Collar – IEC Servo Output Shaft & Ball Screw End Positioning
| Parameter | Value | Note |
|---|---|---|
| SKU / Model | GBC-SCS16 | GBC SCS Series |
| Bore Diameter (d) | 16 mm | Shaft tolerance h6 recommended |
| Outer Diameter (D) | 35 mm | |
| Face Width (B) | 12 mm | |
| Clamping Screw | M5 socket-head cap screw | 5 mm hex key required |
| Slot Width (W) | 1.5 mm | Enables radial flex for clamping |
| Keyway Width (K) | 5 mm | Standard: plain bore; keyway optional on request |
| Shaft Tolerance | 16.000 / 15.989 mm | ISO 286 h6 |
| Material | Aluminium alloy | Anodized finish available on request |
| MOQ | 100 pcs | Custom engineering drawings accepted |
Product Overview
Among metric shaft sizes, 16 mm is the single most prevalent output diameter for IEC 80-frame servo motors and the most common end-journal diameter for ground ball screws in the SFU1605 and SFU1610 families. The GBC-SCS16 is engineered specifically for these high-demand motion-control environments, pairing a 35 mm OD and 12 mm face width with the M5 clamping screw at a torque capacity that comfortably handles the axial pre-load forces imposed by angular-contact bearing pairs in fixed-end screw supports. The available 5 mm keyway option covers IEC coupling keyway requirements for direct motor-shaft collar use, while the plain-bore version serves pure axial-location duties in bearing housings and end-support blocks.
Key Features
Shaft Surface Protection
The split-clamp principle spreads clamping force uniformly across the full bore circumference, preventing the point indentation and fretting corrosion that set-screw collars create at the contact point. The shaft remains undamaged and fully repositionable throughout the product's service life.
M5 High-Torque Clamping
The M5 socket-head cap screw provides a proof-load capacity approximately 60% higher than the M4 screws used in smaller SCS collars. This increase in clamping force is matched to the larger bore and OD at this size range, ensuring reliable retention under sustained bidirectional axial loading.
Dual Axial-Location Function
A single collar acts as a positive end-stop against a bearing or housing shoulder. A pair of collars sandwiches any shaft-mounted component at a freely adjustable position — a versatile alternative to machined shaft steps that eliminates re-machining costs when axial positions need to change.
Lightweight Aluminium Alloy Body
Aluminium alloy construction keeps collar mass below 30 g for all bore sizes in the 16 mm OD range, minimising the rotational inertia penalty in dynamic drive assemblies and the static load penalty on vertically mounted shafts.
5 mm Keyway Option for Torque Locking
A standard 5 mm DIN 6885 keyway can be broached on request, enabling the collar to transmit rotational torque simultaneously with axial positioning. Specify at order — default supply is plain bore.
Typical Application Scenarios
IEC Servo Motor Output Shafts
The 16 mm output shaft of IEC 80-frame servo motors is the standard interface for inline gearboxes and timing-pulley drives in industrial automation. The SCS16 clamp collar positions the pulley hub against the motor flange face, replacing the unreliable set-screw collar that is commonly factory-supplied but fails under bidirectional torque reversals.
Ball Screw Fixed-End Supports
SFU1605 and SFU1610 ball screws terminate in 16 mm journals that seat in angular-contact bearing pairs. The SCS16 applies axial pre-load to the outer bearing race by collar position, providing repeatable pre-load without the special pre-load nuts that require dedicated tooling.
Automated Optical Inspection Systems
Camera gantry linear axes in PCB automated optical inspection machines use SCS16 collars to define the travel limits of ball-screw driven stages, providing a positive mechanical end-stop that prevents over-travel without relying solely on software position limits.
Dimensional Guide & Shaft Fit Specification
The three principal dimensions — bore d = 16 mm, outer diameter D = 35 mm, and face width B = 12 mm — define the spatial envelope of the collar in an assembly. The slot width W = 1.5 mm runs the full face width and is the feature that allows the collar to flex radially as the M5 screw closes the gap. Specify the mating shaft to ISO 286 h6 tolerance (16.000 / 15.989 mm) for the optimal combination of sliding fit before clamping and maximum retention force after clamping.
GBC accepts custom orders for alternative bore tolerances (H7, js6), reduced OD profiles to clear adjacent components, extended face widths for higher axial holding force, and surface treatments including natural anodize, hard anodize (25 µm), and electroless nickel plating. Submit your engineering drawing via the contact page for a fast quotation.
Model Selection Guide
For 15 mm bore applications such as conveyor rollers and ink-train shafts, the GBC-SCS15 is the correct choice. For 18 mm shafts — common in textile machinery and light gearbox outputs — the GBC-SCS18 steps up to a 40 mm OD for improved load capacity.
| Model | Bore | Relation |
|---|---|---|
| GBC-SCS15 | 15mm | ← Smaller |
| GBC-SCS16 | 16 mm | ◀ Current |
| GBC-SCS18 | 18mm | → Larger |
Installation Procedure
- Prepare the shaft: Clean and degrease the shaft in the clamping zone. Verify diameter within h6 tolerance (16.000 / 15.989 mm). Remove any burrs or nicks with a fine file.
- Slide and position: Slide the GBC-SCS16 onto the shaft to the required axial location. Use a calibrated depth gauge or a pre-machined spacer as a reference for repeatable positioning.
- Clamp progressively: Using a 5 mm hex key, tighten the M5 screw in two or three incremental steps, checking axial position after each step to correct any settling. Torque M5 screw to 4.0–4.5 N·m. In ball-screw pre-load applications, set collar position with a calibrated spring scale on the screw nut to verify pre-load force before final tightening.
- Load test: Apply the expected axial service load (manually or via the driven machine) and confirm zero collar movement. For vibrating or cyclic-load applications, re-verify screw torque after the first full operating shift.
Frequently Asked Questions
How does an SCS16 clamp collar compare to a set-screw collar for holding a timing pulley on a servo motor shaft?
What is the maximum axial force the SCS16 can hold on an h6-tolerance shaft?
Can SCS16 be used with a 5/8-inch (15.875mm) shaft?
Related Products
Explore adjacent sizes and related components in the GBC range:
- GBC-SCS15 – 15mm bore aluminum clamp shaft collar — smaller bore for finer shaft diameters
- GBC-SCS18 – 18mm bore aluminum clamp shaft collar — next size up for higher axial capacity
- Browse the full GBC SCS Shaft Collar series — available bore sizes from 6 mm to 60 mm
Get a Quote or Submit Your Drawing
Minimum order quantity is 100 pcs. Custom bore tolerances, keyway options, extended face widths, and surface treatments are available. Supply your detailed engineering drawing for an accurate quotation from the GBC team.
The GBC-SCS16 aluminum clamp-type shaft collar targets 16 mm bore IEC servo motor shafts and SFU ball-screw fixed ends. OD 35 mm, face width 12 mm, M5 screw, optional 5 mm keyway. Eliminates the shaft fretting and slippage associated with set-screw collars in bidirectional servo drives.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
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