When your scaffold configuration requires a horizontal tube connection to the outside of a standard at a position where a standard coupler cannot be used, the External Hook Coupler from Altrad Generation provides a secure, fast-fit solution for sheeting rails, fan members, and ancillary tube attachments.
Available from Altrad Generation as part of the complete scaffold fittings range, external hook couplers work alongside internal hook couplers, double couplers, and scaffold tube to cover all connection requirements across your scaffold build.
External Hook Coupler Applications
Sheeting rail attachment to scaffold standards for debris netting and scaffold sheeting
Fan scaffold member connections where standard couplers cannot be used
Temporary support and ancillary tube attachment to existing scaffold standards
Connections at restricted access points in complex scaffold geometries
Compatible with 3.2mm scaffold tube and 4.0mm scaffold tube throughout the Altrad Generation range
External vs Internal Hook Coupler
The external hook coupler clamps to the outside surface of the standard tube. The internal hook coupler fits inside the tube bore for a different connection geometry. Your scaffold design specifies which type is appropriate for each application. Both are available from your local Altrad Generation branch.
Full Scaffold Fittings Range
Browse the complete scaffold fittings range for all drop forged and pressed fittings, including double couplers, putlog couplers, swivel couplers, base plates, and toe board clips.
Frequently Asked Questions
Q. What is an external hook coupler?
A. An external hook coupler attaches a horizontal tube to the outside of a scaffold standard or vertical tube. The hook clamps onto the outer surface of the tube rather than passing through an aperture, allowing a tube to be connected at positions where a standard coupler cannot be fitted.
Q. Where is an external hook coupler typically used in scaffolding?
A. External hook couplers are used for attaching sheeting rails, fan scaffold members, temporary supports, and ancillary components to the outside of scaffold standards. They are also used where access for a standard coupler is restricted by the scaffold geometry.
Q. What tube size does the external hook coupler fit?
A. The external hook coupler is designed to fit 3.2mm and 4.0mm scaffold tube. Check the product specification to confirm suitability for the tube grade and wall thickness on your scaffold.
Q. Is the external hook coupler a structural coupler?
A. External hook couplers are non-structural fittings for attaching secondary tubes and ancillary components to scaffold standards. For primary structural connections between standards, ledgers, and transoms, use drop forged double couplers rated to BS EN 74-1:2005.
Q. Are external hook couplers compatible with all scaffold tube types?
A. External hook couplers are designed for 3.2mm and 4.0mm scaffold tube. They are compatible with the Altrad Generation range of 3.2mm galvanised scaffold tube and 4.0mm galvanised scaffold tube. Confirm the hook profile matches your tube grade before use.
Contact your local Altrad Generation branch to discuss external hook couplers and scaffold fittings, or find your nearest branch using our branch locator.
