Self tappers for the larger hole(s)!

[G&M]

From the rear cover of the PC you are typing on. Not quite self taping in that they need a pilot hole but should do.

[Dave Plowman (News)]

An easy option might be Halfords - they do boxes of assorted including quite large ones.

[dave]

I have to fix two thin (~1mm) steel sheets together and I can only get at one side. The outer sheet is in fact an inspection cover, so needs to come off (but not often). I thought to use self tappers but the largest diam ST's I can find (B&Q et al) is 3mm but the existing fixing holes are bigger than than - about 4 mm. Can someone tell me where either a) where I can get larger ST's b) Are there better "one side" fasteners available from somewhere? tia ps The original fixing were "use once" plastic-popper type things.

[Sunbeam]

Overkill probably but will you find something to suit your purpose here.

The site has grown considerably since I last looked.

I have a bucketful of self tappers about 6mm core x 13mm (ish), I will have to check. Email me and I could send you a few.

Sunbeam

reply address is not valid, use nick p at british farmers dot com no spaces

[mrcheerful]

The hvac trade do this all the time, use sheet metal fasteners (screwfix sell them) they drill their own hole and have a nice chunky thread. The head is 8mm hex with a washer built in. You can also get the type with a rubber washer as used for roofing sheets, these are sometimes better as they tend to keep done up under vibration etc. They are also great in car repair work.

mrcheerful

[dave]

Thanks vm. Screwfix have them, as you say. (found under "blind bolts").