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DavidA:
My own interest in this Whitworth into UNC or vice versa comes from a very (last week) recent problem that arose at work.

The test house needed to do a tensile test on a capscrew that at first appeared to be Whitworth. The lad who was going to do the test was losing his hair as he couldn't get the screw to fit the Whitworth dolly (adaptor) that holds it in the machine.
It dawned on me that it may be a UNC thread; and it was.  It was the first UNC thread he had come across .

It went into the dolly about half a turn then stopped.

Solution;  We bought a set of UNC taps and made another dolly for the job.

I agree that you could force one into the other if the material was soft and the need great enough. But not into a hardened steel adaptor.

Dave.

PekkaNF:
OK. Went shopping today.

MINE has 3/8-16 UNC.

They go clear trough untapped holes and thread on tapped holes - after some gunked up residue has been cleaned off.

Bought 10 bolts each from 25 to 38 mm.

Pekka

stefang:
Hi,

Short Question:

Are there 1-2-3 blocks with metric threads out somewhere?

Imperial studs and screws are hard to find over here  ::)

Stefan

David Jupp:
Surely they would be 25 - 50 - 75 (mm) blocks with metric threads ?   Or maybe some other convenient multiples ( 20-40-60 ?) , or are 1-2-3 blocks used even in countries that work entirely in mm ?

No1_sonuk:
Stefan,
You might be able to get imperial bolts at reasonable prices from the UK.
No customs charges to Germany.  :thumbup:

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