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Hex head or some head bolts for trunking

Baldyhugh
Hi


Im currently nearing completion of a steel trunking job and was looking for some advice. The 3x3 steel trunking is fixed on top of unistrut running perpendicular to it at regular intervals. I used M10 zebedees and hex head bolts for this. I now wondered if I should have used dome head bolts instead for the same reason as M6 dome head bolts are used to bolt the trunking together - to protect the cable. Was just wondering what others use in this circumstance


Thanks
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  • 0
    Hi


    thanks all for your replies. On another note, what fixings do others use when fixing trunking for example to a surface? Countersunk or panhead screws? Different contractors I have worked with have used both. I must admit on larger steel trunking, a single red rawlplug and screw every couple of feet doesn’t fill me with much confidence especially if the trunking could be eventually filled with cables, it’s quite a weight. On this job I used frame fixings and a large flat washer. Some call them concrete screws, they screw into a predrilled hole with no plug required, kind of like a thunderbolt. They have a countersunk head with a torx fitting to drive them in. I must say they did a good job. Do others prefer panhead or countersunk screws for this application
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  • 0
    Hi


    thanks all for your replies. On another note, what fixings do others use when fixing trunking for example to a surface? Countersunk or panhead screws? Different contractors I have worked with have used both. I must admit on larger steel trunking, a single red rawlplug and screw every couple of feet doesn’t fill me with much confidence especially if the trunking could be eventually filled with cables, it’s quite a weight. On this job I used frame fixings and a large flat washer. Some call them concrete screws, they screw into a predrilled hole with no plug required, kind of like a thunderbolt. They have a countersunk head with a torx fitting to drive them in. I must say they did a good job. Do others prefer panhead or countersunk screws for this application
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