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Tool for recessing screw head on steel trunking cover

houstonceng

Hi all.  I’m installing some steel trunking and need to create the recess/ dimple/ sewage in the covers to fit the turnbuckle screws.   I know there is a tool to do this, but cannot find one when searching t’internet.  It’s similar to a screwed hole punch in that the bolt goes through the 10mm hole and you wind it in so that the domed male side pushes the cover material into the female die to create the recess.  Does anyone know the correct name for the tool, or who makes it, or where I can buy one?

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  • +1

    I wonder what effect the countersink punch would have on the paint or galv finish?

    I suspect the more usual solution is just to use an offcut of lid and cut to size so the holes are where you need them. Or is the problem more sophisticated than that?

       - Andy.

  • 0 in reply to AJJewsbury

    Galvanising should be self healing.  It isn't always possible to use sections of lids that already have one fixing turnbuckle.  In any case, all sections should have a turnbuckle near each ends and 3m lengths have the fixings too far apart for short sections..  If you are worried about the finish, cutting and drilling would be more of a concern.

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  • 0 in reply to AJJewsbury

    Galvanising should be self healing.  It isn't always possible to use sections of lids that already have one fixing turnbuckle.  In any case, all sections should have a turnbuckle near each ends and 3m lengths have the fixings too far apart for short sections..  If you are worried about the finish, cutting and drilling would be more of a concern.

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