The Q Clamp 128-4 is a 3-Way 90° Elbow key clamp fitting for 3.2mm scaffold tube and 4.0mm scaffold tube. Manufactured from hot-dipped galvanised malleable iron to BS EN 1562:1997, it creates strong, weld-free connections for handrails, guardrails, industrial racking, and structural tubular frameworks on construction sites and in industrial applications across the UK.
Altrad Generation supplies the full Q Clamp range for 3.2mm and 4.0mm scaffold tube from Altrad Generation. Pair with stainless steel grubscrews for improved corrosion resistance, and use the Allen Key Tool for correct grubscrew installation torque.
Q Clamp 128-4 - 3-Way 90° Elbow
Type: 3-Way 90° Elbow fitting for 48.3mm (Size 4) scaffold tube
Material: Blackheart malleable iron casting to BS EN 1562:1997 Grade B32-10
Finish: Hot-dipped galvanised to BS EN 1461:1999 for corrosion resistance
No welding required - grubscrew mechanism locks tube securely inside socket
Compatible with stainless steel grubscrews for enhanced outdoor durability
Available from Altrad Generation for hire and sale
Q Clamp Applications
Q Clamps are used across scaffolding, industrial handrails, guardrails, racking, signage frames, market stalls, trolley bays, and temporary structures. The weld-free grubscrew system allows fast disassembly and reconfiguration, making Q Clamps the preferred fitting for installations requiring regular modification. View the full Q Clamp range for all available configurations.
Q Clamp Tube Compatibility
The -4 suffix confirms this fitting is sized for 48.3mm OD tube, the same diameter as the Altrad Generation 3.2mm galvanised scaffold tube and 4.0mm galvanised scaffold tube range. For non-scaffold tube applications, confirm the OD falls within the 47-50mm range accepted by Size 4 fittings.
Frequently Asked Questions
Q. What is the Q Clamp 128-4-4 used for?
A. The Q Clamp 128-4-4 is a 3-Way 90° Elbow fitting for 3.2mm and 4.0mm scaffold tube. You use it to create secure, weld-free connections for scaffolding handrails, guardrails, racking systems, and industrial tubular structures. The grubscrew mechanism locks the tube inside the socket when tightened with an Allen key.
Q. What tube size does the -4 suffix indicate?
A. The -4 suffix indicates the Q Clamp is sized for 48.3mm outside diameter tube, which is the standard scaffold tube diameter used across UK construction. This is also known as Size 4 in the Q Clamp system, corresponding to 1½" nominal bore tube.
Q. What material are Q Clamps made from?
A. Q Clamps are manufactured from blackheart malleable iron castings to BS EN 1562:1997 Grade B32-10, with a hot-dipped galvanised finish to BS EN 1461:1999. The galvanised coating provides corrosion resistance for outdoor and site use.
Q. Are grubscrews included with Q Clamps?
A. Q Clamps are supplied with standard grubscrews. For additional corrosion resistance in outdoor or marine environments, stainless steel grubscrews are available separately from Altrad Generation and provide a significant upgrade over standard zinc-plated screws.
Q. What Allen key size is required for Q Clamp installation?
A. Q Clamps are tightened with an Allen key. The correct Allen key size depends on the grubscrew specification. Altrad Generation supplies an Allen Key Tool specifically sized for the Q Clamp grubscrew thread. Always use the correct size key to avoid stripping the screw head.
Get in Touch with Us
Contact your local Altrad Generation branch to discuss Q Clamp 128-4 and the full Q Clamp range, or find your nearest branch using our branch locator.
