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george

United Kingdom
862 Posts
Posted - 13/12/2011 :  17:22:55  Show Profile
I have just been given a nice old set of bsf taps and dies in a fitted wooden box by Fred Bates and co probably from the 20s or 30s strange thing to me is that included are a set of 9/32 taps and dies at 26tpi .I have never come across this size of thread in bsf unf or whit ,is it unusual or have I had a sheltered upbringing .Geoff

Peter Green

United Kingdom
1682 Posts
Posted - 13/12/2011 :  18:47:20  Show Profile
George / Geoff,

9/32 x 26tpi is a BSC (British Standard Cycle) thread.

Peter.
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george

United Kingdom
862 Posts
Posted - 13/12/2011 :  18:59:35  Show Profile
thanks Peter but the script on the shank of the tap [and the die] says 9/32x26 bsf, very odd geoff
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Alan Bertram

United Kingdom
199 Posts
Posted - 13/12/2011 :  20:59:20  Show Profile
Geoff, 9/32" BSF is a stock size.

http://www.tapdie.com/html/bsf__dies.html

Alan
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Colin Butchers

United Kingdom
1487 Posts
Posted - 15/12/2011 :  10:01:26  Show Profile
The current Catalogue from Tracy Tools lists 9/32 BSF (26 t.p.i.) as a standard stock item and Taps are £3.00 each and Dies £4.00.

Colin B.
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John Reid

United Kingdom
704 Posts
Posted - 15/12/2011 :  12:14:33  Show Profile
9/32 x 26 tpi can be a Cycle thread or BSF, so it shows the importance of specifying the series as well as the numbers. They are not interchangeable - Cycle threads are 60 degrees but the BSF thread is Whitworth form which is 55 degrees.

John R
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Peter Scott

United Kingdom
1240 Posts
Posted - 15/12/2011 :  13:22:08  Show Profile
quote:
Originally posted by Colin Butchers

The current Catalogue from Tracy Tools lists 9/32 BSF (26 t.p.i.) as a standard stock item and Taps are £3.00 each and Dies £4.00.

Colin B.


If you want HSS then you have to add +200% to the price.

Peter
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george

United Kingdom
862 Posts
Posted - 15/12/2011 :  17:58:28  Show Profile
Has anybody ever found a use or seen an application for 9/32 nuts or bolts ?.Geoff
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george

United Kingdom
862 Posts
Posted - 17/12/2011 :  10:33:48  Show Profile
thanks to Alan I now know that 9/32 makes a good repair scheme for torn 1/4 threads in castings as they share the same tpi cheers geoff
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