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Imperial thread nomenclature

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Deadeye

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I bought an old sander and one of the plate mounting machine screws is broken.
The major diameter (learned somehting today) is 1/4" and it's 1/2" long. I got a thread gauge (every day is a school day for newbies) - it's 36 whitworth.

Now, the rub is that I can't seem to find a 36/inch 1/4" diameter bolt for love or money - they're all 20, 28 or 32.
Am I searching for the right thing? Is there a more common nomenclature for the same thing?
Countersunk ideally, but I'd put up with hexagonal heads right now!
 

Deadeye

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I got the diameter wrong though - 5/32.
But it is 36G.
I can get taps that size, but not bolts!
 

Deadeye

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Owwww. My embarassment hurts!
I was deceived by all the other imperial bits I have been playing with.

It's a bog standard M4.
:((
Sorry!
 

novocaine

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Morris and bl did metric bolts with whitworth heads for 30 odd years l, didnt know many others did it too.

Sneaky so and sos.
 

Deadeye

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novocaine":3egi10d6 said:
Morris and bl did metric bolts with whitworth heads for 30 odd years l, didnt know many others did it too.

Sneaky so and sos.
You're being generous. A simpler explanation is that I'm an silly person.
To be fair, everything I've been playing with recently is ages old so I'm in the habit of using imperial calipers, and 5/32 is v close to 4mm...
Yup, I'm just an silly person...
 
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