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Workshop Add Bore & Keyway Service

+ £0.00 (£0.00 each)

Order total (product + machining): £57.00

Price varies by bore size and Bore Qty (per machined hub).

Bore size (Hub 1)

Bore size (Hub 2)

Bore Qty (machined items)

Max equals product quantity.

Please Confirm any Additional Machining Details Required (optional)

Keyway size (optional)

Price Breakdown

Up to 25mm (0.984") – (£15)
Up to 40mm (1.575") – (£20)
Up to 60mm (2.362") – (£30)
Over 60mm (2.362"+) – (£45)

Quantity Discount Breakdown

1 to 5 items: No discount
6 to 9 items: 10% off
10 to 19 items: 15% off
20 to 49 items: 20% off
50 to 99 items: 25% off
100+ items: 30% off

SKU: GR-28 Complete AROFLEX GR Couplings

GR-28 Complete Coupling

Original price was: £76.00.Current price is: £57.00.

ex. VAT · £68.40 inc. VAT

JS9 Tight Fit Anti-Roll H7 Precision Transition Fit ISO 9001 Quality Assured

In Stock — Dispatches within 24 hours. Bulk orders (10+) available — call for lead time.

Technical Specifications

Standard Max Bore

38mm

Outside Diameter

65mm

Total Assembled Length

90mm

Insert Material

Red Polyurethane (98 Shore A)

Rated Torque (Nominal)

160Nm

Max Speed

8500 RPM (Steel Hub) / 5850 RPM (Cast Iron)

Alignment Tolerance

Radial: 0.25mm / Angular: 0.9° / Axial: -0.7 to +1.5mm

Weight

1.24kg

Dimensions (L × W × H)

6.5 × 6.5 × 8.9 cm

Overall envelope

Standards & Fit

JS9

JS9 Keyway Tight fit anti-roll standard

Precision Transition Fit Precision bore fit

ISO

ISO 9001:2015 Quality Assured

Parameter	Value	Notes
SKU	GR-28	Aroflex part number
Standard Max Bore	38mm
Outside Diameter	65mm
Total Assembled Length	90mm
Insert Material	Red Polyurethane (98 Shore A)
Rated Torque (Nominal)	160Nm
Max Speed	8500 RPM (Steel Hub) / 5850 RPM (Cast Iron)
Alignment Tolerance	Radial: 0.25mm / Angular: 0.9° / Axial: -0.7 to +1.5mm
Weight	1.24 kg
Dimensions	6.5 × 6.5 × 8.9 cm	Overall envelope
Bore Tolerance	H7	Precision transition fit
Material	Steel / Friction disc	Standard construction
Certification	ISO 9001:2015	Quality assured

GR-28 Series Complete Coupling

The GR-28 Series is a robust, torsionally flexible industrial coupling designed for reliable power transmission and shock absorption. This complete set features two high-strength hubs and a precision-moulded polyurethane spider, engineered to protect connected machinery by dampening torsional vibrations and compensating for shaft misalignments.

Superior Torque Handling: Rated for 160Nm (with Red 98 Sh-A insert), providing the necessary capacity for medium-duty pumps, compressors, and general industrial gearboxes.
98 Shore A Hardness Insert: The high-durometer red polyurethane spider offers excellent resistance to oils, chemicals, and extreme temperatures (-30°C to +90°C continuous / up to 120°C peak).
Vibration Damping: The curved jaw design is specifically optimised to absorb operational shocks and resonance, significantly extending the service life of bearings and seals in industrial drive-trains.
Durable Hub Construction: Typically supplied in high-quality sintered steel or cast iron (GJL), providing the structural mass and durability required for steady-state industrial power transmission.
Fail-Safe Operation: Designed as a “fail-safe” coupling; the jaws will remain interlocked to transmit torque even if the elastomer spider fails, preventing a complete loss of drive in critical systems.