GBC-SCS45 Aluminum Clamp Type Shaft Collar – 45mm Bore
The GBC-SCS45 aluminum clamp-type shaft collar introduces the M10 clamping screw for 45 mm bore shafts. OD 80 mm, face width 22 mm, optional 14 mm keyway. Delivers 6–9 kN axial retention — purpose-built for ship auxiliary gearboxes, large industrial fan hubs, and heavy pump crankshaft balance assemblies.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
45mm Bore Aluminum Clamp Shaft Collar – M10 Maximum-Force Design for Ship Auxiliary Machinery & Heavy Transmission Shafts
| Parameter | Value | Note |
|---|---|---|
| SKU / Model | GBC-SCS45 | GBC SCS Series — Large Bore |
| Bore Diameter (d) | 45 mm | Shaft h6 tolerance: 45.000 / 44.984 mm |
| Outer Diameter (D) | 80 mm | Provides thick wall for high-clamp loads |
| Face Width (B) | 22 mm | Extended width for high axial bearing area |
| Clamping Screw | M10 socket-head cap screw | Torque: 30–35 N·m · 10 mm hex key |
| Slot Width (W) | 2.0 mm | Wide slot for easy assembly over shaft features |
| Keyway Width (K) | 14 mm | DIN 6885 Form A; plain bore is default supply |
| Recommended Torque | 30–35 N·m | Use calibrated torque wrench |
| Material | Aluminium alloy | Hard-anodize, electroless nickel & steel variants available |
| MOQ | 100 pcs | Custom engineering drawings accepted |
Product Overview
The GBC-SCS45 marks the first appearance of the M10 clamping screw in the SCS aluminium collar series — a deliberate escalation that places the achievable clamping torque above 30 N·m and the corresponding axial holding force in the 6–9 kN range on h6-tolerance shafts. At 45 mm bore, 80 mm OD, and 22 mm face width, the SCS45 is specified for the class of heavy-duty transmission and auxiliary machinery shafts where the smaller M8-screw collars reach the edge of their retention envelope: ship auxiliary gearboxes and windlass drives where marine vibration spectra are broad and sustained; large industrial fan rotor hubs where shaft-end overhang creates significant gyroscopic moments; and heavy-duty pump and compressor crankshaft balance-weight assemblies where installation positions must hold to within 0.1° of angular position across thousands of hours of continuous operation. The 14 mm keyway — the widest DIN 6885 key for 45 mm bore — enables the collar to carry the full rated coupling torque at this shaft size without relying solely on friction clamping, providing a safety margin essential in marine and energy-sector applications where component failure consequences are severe.
Key Features
Non-Damaging Clamp Design
Circumferential clamping force eliminates shaft surface indentation, preserving ground shaft finishes and protecting adjacent seals and bearings from the accelerated wear caused by the stress-concentration marks that set-screw collars leave on large-diameter shafts where replacement cost is high.
M10 High-Capacity Clamping Screw
The M10 socket-head cap screw delivers clamping torque up to 30–35 N·m — the highest in the SCS range at this bore level — producing axial holding forces that match the sustained thrust loads of large industrial machinery operating continuously at rated capacity.
2.0 mm Wide Slot — Field Assembly Advantage
The 2.0 mm slot width provides generous bore clearance for sliding the collar over shaft keyways, threads, and groove features without tools or force — a significant advantage on large shaft assemblies built in the field without alignment fixtures or heating equipment.
22 mm Face Width — Maximum Axial Bearing Area
The 22 mm face width is matched to the bore and OD at this size to deliver the highest axial bearing area in the SCS range, distributing clamping contact pressure across a wide band that maximises holding force and minimises bore surface pressure under long-term sustained axial loads.
14 mm DIN 6885 Keyway — Full-Torque Locking Option
The 14 mm keyway follows DIN 6885 Form A for 45 mm bore, providing both axial location and full-rated rotational torque transmission through a single component. Specify at order — default supply is plain bore without keyway.
Typical Application Scenarios
Ship Auxiliary Gearbox & Windlass Drives
Anchor windlass drives, mooring winch transmissions, and bow-thruster auxiliary gearboxes on commercial vessels operate through 45 mm shafts under load spectra that combine sustained axial thrust from mooring loads with broadband vibration from hull-borne sea-state excitation. The SCS45 M10 clamp force and 22 mm face width maintain collar position under these combined loading conditions across extended ocean passages without interim maintenance access.
Large Industrial Fan Rotor Hub Assemblies
Centrifugal fan impellers in industrial ventilation, cement kiln cooling, and petrochemical fume-extraction systems mount on 45 mm shafts where shaft-end overhang amplifies gyroscopic loads on the collar during transient speed changes. The SCS45 high-clamp design holds impeller-hub axial positions within the tight limits needed to maintain aerodynamic blade-tip clearances that determine fan efficiency and noise levels in continuous-duty installations.
Heavy Pump & Compressor Balance-Weight Shafts
Reciprocating pump crankshafts and compressor balance-shaft assemblies in oil-field and petrochemical service mount balance weights on 45 mm journals where angular position accuracy determines the residual vibration of the entire machine train. The SCS45 with 14 mm keyway locks balance-weight angular and axial positions simultaneously, enabling precision balancing without the machined splines or interference fits that make future weight adjustment impractical.
Dimensional Guide & Shaft Fit Specification
The GBC-SCS45 is defined by bore d = 45 mm, outer diameter D = 80 mm, and face width B = 22 mm. The 2.0 mm slot runs the full face width, providing the radial flex gap that allows the bore to close around the shaft as the M10 screw is tightened to 30–35 N·m. Specify the mating shaft to ISO 286 h6 (45.000 / 44.984 mm) for the optimal pre-installation sliding fit and maximum post-clamping axial retention force. Bore sizes above 40 mm must be verified with a calibrated bore gauge rather than relying on nominal dimensions — manufacturing tolerances on large shafts can approach 0.05 mm and will significantly affect clamping performance if outside the h6 band.
GBC supplies custom configurations including steel and stainless steel construction, extended face widths, twin-screw clamping, marine-grade anodizing, and bore sizes above 60 mm. Contact the GBC team via the enquiry page with your engineering drawing and application details for a tailored quotation.
Model Selection Guide
For 40 mm bore applications in large gearbox and rotary-table drives where M8 clamping is sufficient, the GBC-SCS40 provides the 70 mm OD at 18 mm face width. Stepping up to 50 mm bore for the largest class of industrial pump and gearbox shafts, the GBC-SCS50 shares the M10 screw and 22 mm face width with a widened 3 mm slot for easier assembly.
| Model | Bore | Relation |
|---|---|---|
| GBC-SCS40 | 40mm | ← Smaller |
| GBC-SCS45 | 45 mm | ◀ Current |
| GBC-SCS50 | 50mm | → Larger |
Installation Procedure
- Shaft measurement: Measure the shaft diameter at the collar location using a calibrated micrometer or bore gauge, confirming the dimension falls within ISO h6 (45.000 / 44.984 mm). At large bore sizes, do not assume nominal dimensions — verify physically.
- Surface preparation: Degrease the clamping zone with a solvent wipe. For shafts with light rust or scale, polish with 400-grit abrasive cloth before degreasing. Remove all burrs from keyway edges to prevent bore scoring during collar installation.
- Collar positioning: Open the slot fully by backing off the M10 screw two full turns. Slide the GBC-SCS45 onto the shaft to the required position, referencing a pre-set depth gauge or spacer for repeatable placement. Torque M10 screw to 28–32 N·m with a calibrated torque wrench and 8 mm hex-bit socket. In marine applications, coat the bore and shaft with anti-seize compound before installation to prevent galvanic corrosion bonding between aluminium collar and steel shaft.
- Torqued clamping: Using a calibrated torque wrench with a 10 mm hex-bit socket, tighten the M10 screw in three steps — 30%, 70%, then 30–35 N·m — checking position after each step. Mark the screw head with a paint pen after final tightening to detect any self-loosening during subsequent inspections.
Frequently Asked Questions
What is the recommended M10 screw torque for the SCS45, and what tool is required?
Is the aluminium SCS45 suitable for marine saltwater environments?
How does the SCS45 face width of 22mm affect installation in confined shaft assemblies?
Related Products
Browse adjacent sizes and associated shaft components from GBC:
- GBC-SCS40 – 40mm bore aluminum clamp shaft collar — next smaller size in the heavy-bore SCS range
- GBC-SCS50 – 50mm bore aluminum clamp shaft collar — next larger size for maximum axial capacity
- Complete GBC SCS Shaft Collar Series — all standard bore sizes from 6 mm to 60 mm, with custom options beyond
Request a Quote or Discuss a Custom Specification
Minimum order quantity is 100 pcs. GBC supplies steel and stainless steel variants, marine-grade hard-anodizing, extended face widths, twin-screw configurations, and custom bore sizes above 60 mm. Supply your engineering drawing for a precise quotation.
The GBC-SCS45 aluminum clamp-type shaft collar introduces the M10 clamping screw for 45 mm bore shafts. OD 80 mm, face width 22 mm, optional 14 mm keyway. Delivers 6–9 kN axial retention — purpose-built for ship auxiliary gearboxes, large industrial fan hubs, and heavy pump crankshaft balance assemblies.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
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