B s p

[Michael R.]

Yes, BSP, or British Standard Pipe. Not to be confused with another BSP. Apparently there are two of them, one parallel, the other tapered. Therefore BSPP and BSPT.
Doug L. and I were discussing the thread size found on bogie spindles. The good book FUC-03 sez they are 7/8x14 B.S.P.. (see page 153 or 156)

Hmmm........ never a dull moment with BSF, BSW, UNF, UNC and now BSP(P). In my mind's eye I can see those Brit engineers smiling ... "exactly, my dear Michael".

A quick look through the MLU archives provides an assortment of thoughts on the thread size, but I could not find any post or "thread" (the MLU pitch) that revealed more than what the FUC-03 manual states. Initially, I thought the manual must be wrong, as the spindle thread O.D. measure better than 30mm. But no, it appears the 7/8 BSP thread relates to the bore size of a pipe for which the thread is suitable. The nominal size is somewhat larger than the stated number.

The drawings for making a spindle drift from a discarded early series TL334 spindle do not mention the thread. The spindle nut TL 335 - CTL 335 is simply called a Nut - spindle, without a size stated.

Now to find a die nut in 7/8 x 14 BSP(P).