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Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread. 1 in 16 to diameter (3/4 in taper per foot) Angle of thread = 55 degrees. The majority of the pipe threads you will encounter on a British bikes will be the straight or parallel pipe threads. All the fuel tanks and banjo bolts used BSPP.
Cycle Engineers’ Institute (CEI) or British Standard Cycle (BSC) The most common thread on British Cycles prior to 1970. These are the two different names commonly used for the same thread form. It used a 60 degree thread angle, rather than the 55 degree of BSW and BSF. For sizes from 1/4″ through 1/2″ by far the most common are 26 tpi ...
The reason for the two sizes goes back to the Industrial Revolution --- to be exact the year 1841 because in that year Joseph Whitworth introduced the first standard thread to avoid confusion in Britain’s burgeoning engineering industry. The name of the thread was understandably eponymous, although its full name was British Standard Whitworth.
Toll Free Order Line: 1(800) 634-3250 JRC Engineering Inc. 3110 Indian Ave Unit 1E, Perris, CA, 92571
Conversion Tables U.N.c. THREADS B.S.F. U.N.E.F. No of thds. 1/4 in. 5/16 in. 3/8 in. 7/16 in. 1/2 in. 9/16 in.
dimensions. Rather, they were obligated to use fasteners with Whitworth threads, as specified by Rolls-Royce. Whitworth-form hardware proved impossible to source within the US, so Packard eventually produced all of the necessary fasteners in-house. The first Packard-built Merlins emerged in August of 1941. As would be expected, there were a few
6. Carburetor kit for TR6/7 to fit standard air filter box, 30mm 7. Carburetor kit for T140E 1979-82, replaces Mk2 Amal or Bing 8. Carburetor kit for new Royal Enfield 500, 30 or 32mm 9. Carburetor kit for Ural twins 10. Trident and Rocket 3 gantry conversions to keep stock air box and gantry
Whitworth wrench set pre 1968 British Machines (tightening flange nuts, 1/4w, 5/16bs) SAE wrench set post 1967 British Machines (tightening flange nuts, 7/16 and 1/2 sizes) Metric wrench set (for removing: float chamber plug 17mm, main jet carrier 10mm, main jet 6mm)
Toll Free Order Line: 1(800) 634-3250 JRC Engineering Inc. 3110 Indian Ave Unit 1E, Perris, CA, 92571
Toll Free Order Line: 1(800) 634-3250 JRC Engineering Inc. 3110 Indian Ave Unit 1E, Perris, CA, 92571