What's a 1/2 x 36TPI tap for?

Making 1/2 x 36TPI Nuts?

Ill get my coat

Dave

Looks too fine for that, and I couldn't find anything quickly in the thread tables either.

Might be an instrument thread? Peter

-- Peter A Forbes Prepair Ltd, Luton, UK snipped-for-privacy@easynet.co.uk

Doesn't appear so:

and

On or around Wed, 04 Apr 2007 08:08:00 +0100, Prepair Ltd enlightened us thusly:

cycle threads are mostly 26 pitch.

What's 1/2" on a pushbike ? I can only think of the wheel spindles, and those would probably be 26tpi - and thats fine enough. Are you sure its 36tpi, and not 26?

Other Steve

guns!

I googled for "1/2 x 36" tpi

and got a load of silencers...

BugBear

Interesting stuff - this tap is probably pre WWII if not WWI and was from a workshop specialising in bike production, nothing to do with guns at all.

Steve

It wasn't for a BSA bike was it?

(British Small Arms made guns and push-bikes)

I thought that that was Birmingham Small Arms

AWEM

dunno, maybe.

Yep

My guess is a instrument of some kind, possibly optical, as here:

-- Myford Mat

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