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Pan head or countersunk screws

Baldyhugh
Hi all

Further to a question I posted yesterday regarding using hex head bolts to fix steel trunking to unistrut, some others used dome head gutter bolts instead. These are presumably used so that they potentially damage the cables less than a hex head bolt. Following on from this, what type of screws do others use when fixing steel trunking for example to a block wall. Would you opt for countersunk or panhead screws? Different contractors I have worked with use both and I must admit that on larger steel trunking, the odd red rawlplug occasionally along its length doesn’t fill me with much confidence when the trunking could potentially be full of cable which would be quite a weight. On a recent job with steel trunking I used frame fixings( some call them concrete screws). Basically screws into a predrilled hole in the clockwork and has a countersunk torx head, no rawlplug required.I used these with a large flat washer and it took a great gold but I suppose my question remains are countersunk or panhead screws best (or specified) for fixing trunking or other accessories containing cable?


thanks
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  • 0
    HI Baldyhugh


    If I had to fix trunking to a wall - I'd certainly use uni strut and then fix the trunking to the uni strut with a gutter bolt and zebedee. I actually have loads of uniformly cut uni strut just sitting in a crate, already filed smooth and painted with galv paint on the ends; its really easy to level up the trunking as you go then too. Fit the end caps on the uni strut and it looks the business. 


    But But But - I'd never install three compartment trunking supplying office desks for example (Metal or plastic) on uni strut. I'd then fix direct to the wall with a round head or torx screw and washer. Horses for courses I guess.
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  • 0
    HI Baldyhugh


    If I had to fix trunking to a wall - I'd certainly use uni strut and then fix the trunking to the uni strut with a gutter bolt and zebedee. I actually have loads of uniformly cut uni strut just sitting in a crate, already filed smooth and painted with galv paint on the ends; its really easy to level up the trunking as you go then too. Fit the end caps on the uni strut and it looks the business. 


    But But But - I'd never install three compartment trunking supplying office desks for example (Metal or plastic) on uni strut. I'd then fix direct to the wall with a round head or torx screw and washer. Horses for courses I guess.
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