Hex Head Set Screws – M8 x 25mm – Box of 100

Drop two lengths of threaded rod from the structure — using beam clamps or purlin clips on steelwork — and bolt a length of slotted channel across them beneath the duct, secured with channel nuts and washers. The duct then rests on the channel. Connectors, flat plates and cap ends from the same range finish the assembly, and everything is sized around M8 and M10 threads.

M8 and M10 metric coarse thread (1.5mm pitch on M10), grade 4.8 steel, bright zinc plated, to DIN 975. Rod is supplied in 3 metre lengths and is easily cut to the drop lengths you need on site. Cap ends are available to make cut ends safe, and connectors let you extend a drop where needed.

Two profiles are stocked, both pre-galvanised and supplied in 3 metre lengths: 41mm x 21mm in 1.5mm light gauge, and 41mm x 41mm in 1.5mm light gauge or 2.5mm heavy gauge. The deeper 41 x 41 sections and heavy gauge suit longer spans and heavier loads. All are compatible with our channel fixings of the corresponding size.

Use an M10 beam clamp, which tightens onto the flange of a steel beam to create an M10 suspension point, or an M10 purlin clip for roof purlins. Nothing is drilled or welded, so the structure is unmodified and fixings can be repositioned as the installation develops. Both accept M10 threaded rod directly.

For lighter spiral duct runs and equipment where speed matters. Cut 2mm wire rope from the 100m roll, anchor it with an M8 eye bolt or suitable structural fixing, drop it to the duct and lock it off with a wire clutcher. Fine height adjustment happens at the clutcher rather than by cutting rod, which makes levelling long runs much quicker.

Channel nuts in M8 or M10 lock into the slotted channel and take set screws or rod; hex full nuts, penny washers and hex set screws in matching sizes complete the kit, supplied in boxes of 100. Wedge nuts are also stocked for M8 and M10 fixing into the channel. Everything is stock, with free delivery on orders over £400 excluding VAT.