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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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    I must admit that I work with the trade tubs of I think 500 screws and red plugs. The weapon of choice is scrulux square headed screws as this is basically what most of the wholesalers in my area sell. I generally use the countersunk ones being that is what they sell in the tubs and have never really given it a second thought and use them for general day to day fixing of accessories etc and never had a problem. Yes they do sit slightly proud when screwed in but the edge of the screw is not sharp as to cause any cable damage in my opinion. Scrulux obviously do a panhead version which I have also used in the past and a recent conversation with a colleague has made me consider them more and in hindsight may be a better choice for some things in the future
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    I must admit that I work with the trade tubs of I think 500 screws and red plugs. The weapon of choice is scrulux square headed screws as this is basically what most of the wholesalers in my area sell. I generally use the countersunk ones being that is what they sell in the tubs and have never really given it a second thought and use them for general day to day fixing of accessories etc and never had a problem. Yes they do sit slightly proud when screwed in but the edge of the screw is not sharp as to cause any cable damage in my opinion. Scrulux obviously do a panhead version which I have also used in the past and a recent conversation with a colleague has made me consider them more and in hindsight may be a better choice for some things in the future
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