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Where Can I Get These In Metal?

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ToraToraTora | 20:16 Wed 19th Jul 2017 | Motoring
13 Answers
http://www.ebay.co.uk/itm/16-PCS-NUMBER-PLATE-BOLTS-NUTS-YELLOW-BLACK-SCREWS-FITTING-KIT-MOTORCYCLE-CAR-/291919794108?epid=2057251660&hash=item43f7c68fbc:g:BWMAAOSwHMJYI5-p
I keep breaking them off, often unscrewing them causing hassle. I can't seem to find them. The thread diameter is apparently 5.6mm, not bothered about the head or the length really. I suppose they must be non metric or they'd be M5/6 etc.. Any ideas anyone?
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Why not use M5 bolts (machine screws) of the appropriate length.
With a round head screw there will be little visible difference.
You could paint the screw heads if required.
Question Author
quoi: they are for proper threaded holes, I don;t want to make new holes in metal.

Hymie: I would but they are not M5 or indeed M6, they are 5.6 mm so probably an imperial size.
Having looked on-line, these screws are either M5 or M6 screws.

I suggest you offer the plastic screws up to a 5mm and 6mm nut to determine its correct size and buy the machine screws of the required length.

My bet would be that they are nominally M6 – it would be difficult to insert a screw with an OD of 5.6mm into a 5mm threaded hole.
Question Author
I tried that hymie, M5/6 neither will screw into the holes.
Well in that case it must be a ¼ inch imperial thread – you should be able to confirm this by measuring the thread pitch at 20 per inch, whereas the equivalent metric thread would have a 1mm pitch (25.4 per inch).
Question Author
it's 5.78 wide and 24 Threads per inch as good as I can measure.
Compare your measurements to those on an M6 machine screw, and there should be no noticeable difference.

Place the M6 screw thread against the unkown screw thread to check for a matching pitch.
Question Author
I did that, it wont go into the threaded hole. It starts and then tightens up, I think the thread pitch is wrong.
It could be a 7/32” British Standard Whitworth thread – see the table in this Wiki link.

The dimensions match your measurements – but finding such a screw might prove difficult.

https://en.wikipedia.org/wiki/British_Standard_Whitworth
Question Author
thanks for your help, who'd have thought something so common in plastic is so hard to find in metal.
Would it not be easier to tap a new thread to suit a common modern screw?
Question Author
no I don't want to make a mess of the car. These are very common in all sorts of cars, inexplicably, in plastic but I cannot find them in metal. They also fit on my motorbike.

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