General > The Star and Garter

Thread gauges

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ROYC:
I want to order a set of thread gauges to use on my 1958 BSA.
What threads are used on BSA's ?

JulianS:
These are some of the common ones.

Lots of British standard cycle in 26 tpi up to 3/8 diameter and 26 tpi and 20 tpi over 3/8.

Some BSF - notably the cylinder head bolts  and crankshaft sludge trap. Lucas stuff usually BSF and BA.

Whitworth coarse usually for threads in alloy casings.

The pressure relief valve is unusual - it is 7/8 x 16tpi UNS (Unified National Special)

The thread on the speedo head cable connection is metric 12 mm x 1 mm pitch. ( Gearbox end is BSCy)

ROYC:
Thanks Julian

JulianS:
Almost forgot - oil pipe petrol pipe and petrol tap threads are BSP thread.

Arthur:

--- Quote from: ROYC on 13 February, 2017, 19:42:11 ---I want to order a set of thread gauges to use on my 1958 BSA.
What threads are used on BSA's ?

--- End quote ---
You can get combined metric and imperial thread gauges - you only need one set of imperial gauges because they can be used whatever the thread form, ie BSF, BSW, BSP, UNF, UNC, ANS, etc

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