GBC-SCS30 Aluminum Clamp Type Shaft Collar – 30mm Bore
The GBC-SCS30 aluminum clamp-type shaft collar fits 30 mm bore shafts. OD 55 mm, face width 15 mm, M6 clamping screw, optional 8 mm keyway. Upgraded M6 clamping force handles the shock loads of agricultural baler drives, the sustained pull of heavy belt conveyors, and the axial thrust of medium-duty worm gearbox outputs.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
30mm Bore Aluminum Clamp Shaft Collar – M6 Heavy-Clamping for Agricultural Machinery & Industrial Conveyor Shafts
| Parameter | Value | Note |
|---|---|---|
| SKU / Model | GBC-SCS30 | GBC SCS Series |
| Bore Diameter (d) | 30 mm | Nominal; shaft h6 tolerance recommended |
| Outer Diameter (D) | 55 mm | |
| Face Width (B) | 15 mm | Extended width for higher axial bearing area |
| Clamping Screw | M6 socket-head cap screw | 6 mm hex key required |
| Slot Width (W) | 1.5 mm | Radial flex gap for clamping action |
| Keyway Width (K) | 8 mm | DIN 6885 Form A; plain bore is default |
| Shaft Fit (ISO h6) | 30.000 / 29.987 mm | Sliding fit before clamping |
| Material | Aluminium alloy | Hard-anodize & electroless nickel available |
| MOQ | 100 pcs | Custom engineering drawings accepted |
Product Overview
The GBC-SCS30 marks a decisive engineering step in the SCS series: the clamping screw upgrades from M5 to M6, the OD grows to 55 mm, and the face width extends to 15 mm. Each of these changes is intentional and interdependent. The M6 screw raises achievable clamping torque to approximately 8 N·m — nearly double the M5 maximum — which translates directly into higher axial holding force for the 30 mm bore where agricultural machinery, industrial conveyor drives, and medium-duty gearbox outputs impose axial loads that would overwhelm the smaller screw. The 55 mm OD provides the wall section needed for this clamping force without distorting the bore, while the 15 mm face width distributes the axial reaction load over a wider contact band on the shaft — critical when the collar must hold position under the impact loads of a baler plunger drive or the sustained pull of a heavy conveyor belt operating in a dusty outdoor environment.
Key Features
Zero Shaft Surface Damage
The split-clamp design wraps clamping force uniformly around the shaft circumference, eliminating the localised indentation and fretting fatigue caused by set-screw contact. This is particularly valuable on ground or hard-chrome shaft surfaces where any surface damage accelerates seal and bearing wear adjacent to the collar.
M6 High-Capacity Clamping
The M6 socket-head cap screw is the correct choice for bore diameters in the 30 mm range, delivering clamping torque capacity and proof load matched to the wall section and surface area of the 55 mm OD collar body for reliable retention under the heavy-duty axial loads at this shaft size.
15 mm Extended Face Width
The 15 mm face width provides a wider axial contact band on the shaft than smaller SCS collars. This distributes the axial reaction force over a greater shaft surface area, reducing contact pressure and enabling the collar to hold higher sustained axial loads without risk of bore deformation under long-term service.
Field-Adjustable Axial Positioning
Collar position can be changed during commissioning or maintenance using only a 6 mm hex key — no shaft removal, no bearing housing disassembly, no machining. This makes SCS collars significantly faster to reconfigure than machined shaft steps or welded thrust collars.
8 mm DIN Keyway — Torque Locking Option
The 8 mm keyway follows DIN 6885 Form A for 30 mm bore, enabling simultaneous axial location and rotational torque transmission. Default supply is plain bore — specify keyway at time of order.
Typical Application Scenarios
Round Baler & Square Baler Drive Shafts
Pickup shaft and plunger drive cross-shafts in round and square balers operate at 30 mm diameter under severe shock loads from crop slug ingestion and variable crop density. The SCS30 holds flywheel and sprocket positions against the high-amplitude axial impulses that would cause set-screw collars to migrate within a single field season, avoiding the costly re-alignment that results from sprocket walk.
Industrial Belt Conveyor Tail Pulley Shafts
Heavy-duty belt conveyor tail pulleys in quarrying, mining, and bulk-materials handling facilities mount on 30 mm shafts in plummer-block bearings. The SCS30 defines bearing inner-ring positions under the continuous tension loads — often exceeding 5 kN per bearing — without requiring machined shoulders that add lead time and cost to replacement shafts in the field.
Medium-Duty Worm Gearbox Output Shafts
Worm gearboxes driving screw conveyors, gate valves, and agitators in water treatment and chemical processing plants output through 30 mm solid shafts. The SCS30 locates the driven coupling half against the gearbox seal housing, preventing coupling ingress into the seal lip that causes premature seal failure and product contamination.
Dimensional Guide & Shaft Fit Specification
The GBC-SCS30 is defined by bore d = 30 mm, outer diameter D = 55 mm, and face width B = 15 mm. The slot width W = 1.5 mm runs the full face width, providing the radial flex gap that closes as the M6 screw is tightened. Specify the mating shaft to ISO 286 h6 (30.000 / 29.987 mm) for a sliding pre-installation fit and maximum post-clamping retention. Tighter shaft tolerances such as g6 will reduce retention force; looser tolerances such as h8 should be avoided for duty cycles involving sustained axial loads.
GBC accepts custom specifications including extended face widths up to 25 mm, reduced OD profiles for confined housing installations, twin-screw clamping configurations for maximum holding force, and specialised surface treatments for corrosive or food-contact environments. Submit your engineering drawing via the GBC contact page for a fast quotation.
Model Selection Guide
For 25 mm standard-bore applications where M5 clamping is sufficient, the GBC-SCS25 with 8 mm keyway covers gearbox and conveyor pulley duties. Stepping up to 35 mm bore for heavier conveyor and mining drives, the GBC-SCS35 extends the 60 mm OD and retains the 15 mm face width with a widened 2 mm slot for easier clamping.
| Model | Bore | Relation |
|---|---|---|
| GBC-SCS25 | 25mm | ← Smaller |
| GBC-SCS30 | 30 mm | ◀ Current |
| GBC-SCS35 | 35mm | → Larger |
Installation Procedure
- Shaft preparation: Measure the shaft diameter with a calibrated micrometer to confirm it falls within h6 tolerance (30.000 / 29.987 mm). Degrease the clamping zone and remove burrs with a flat file.
- Collar placement: Slide the GBC-SCS30 onto the shaft to the required axial position. For heavy assemblies, use a mallet and a soft brass drift to move the collar if shaft features resist free sliding.
- Progressive clamping: Insert a full-length 6 mm hex key and tighten in three incremental steps — 30%, 60%, then full torque — checking position after each step. Torque M6 screw to 7.5–8.0 N·m using a full-length 5 mm hex key. In agricultural applications, check and re-torque after the first 8 hours of field operation — soil vibration and impact loads can relax initial pre-load before the collar fully beds in.
- Operational verification: After initial operation under load, re-check screw torque. For high-vibration environments, apply medium-strength threadlocker before final tightening and mark the screw head for visual drift detection during inspections.
Frequently Asked Questions
Why does the SCS30 switch to M6 when SCS22 and SCS25 still use M5?
Is aluminium appropriate for an outdoor agricultural environment?
How does the 15mm face width in SCS30 improve performance versus the 12mm in SCS25?
Related Products
Browse adjacent sizes and related drive components in the GBC SCS series:
- GBC-SCS25 – 25mm bore aluminum clamp shaft collar — smaller bore for lower shaft diameter requirements
- GBC-SCS35 – 35mm bore aluminum clamp shaft collar — next larger size with higher axial load capacity
- Full GBC SCS Shaft Collar Range — bore sizes 6 mm to 60 mm, all available with custom specifications
Request a Quote or Submit a Custom Drawing
Minimum order quantity is 100 pcs. GBC supplies custom bore tolerances, keyway options, extended face widths, twin-screw configurations, and corrosion-resistant surface treatments. Provide your engineering drawing for an accurate quotation.
The GBC-SCS30 aluminum clamp-type shaft collar fits 30 mm bore shafts. OD 55 mm, face width 15 mm, M6 clamping screw, optional 8 mm keyway. Upgraded M6 clamping force handles the shock loads of agricultural baler drives, the sustained pull of heavy belt conveyors, and the axial thrust of medium-duty worm gearbox outputs.
MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
Related products
-
GBC-SCS13 Aluminum Clamp Type Shaft Collar – 13mm Bore
-
GBC-SCS35 Aluminum Clamp Type Shaft Collar – 35mm Bore
-
GBC-SCS20 Aluminum Clamp Type Shaft Collar – 20mm Bore
-
GBC-SCS40 Aluminum Clamp Type Shaft Collar – 40mm Bore
-
GBC-SCS15 Aluminum Clamp Type Shaft Collar – 15mm Bore
-
GBC-SCS08 Aluminum Clamp Type Shaft Collar – 8mm Bore