vacuum tank restoration

[R.White]

[quote name=1936 D2;

It would be interesting to know if "pipe threads" work this same way concerning American pipe thread descriptions and BSP.

The answer to this question has been given to me by one of the 'Austin 7' gurus.

There are no less than three types of pipe thread used in our hobby. B.S.P. (British Standard pipe)' date=' A.N.P.(American National Pipe) and Metric.

Both the British and American standards have two types; parallel and tapered.

BSP is based on the Whitworth format which was the first standardised thread arrangement in the world - devised by Joseph Whitworth in 1841. This uses a pitch (or thread angle) of 55 degrees with usually an even number of threads per inch for bolts and screws but an odd number for pipe (BSP).

The American system, on the other hand, was devised by William Sellers in the late 1800's and a 60 degree thread angle is used with mostly even threads per inch (TPI) throughout including the pipe threads.

In summary; if it is a British pipe connection it should be B.S.P. and if American, it is A.N.P. with either parallel or tapered fittings.

.......... That is unless it is flippin metric !

[1936 D2]

Thanks for that Ray!