Solving the Thread Mystery

From the Workshop: Thread Types and Sizes

In a perfect world, all thread sizes would be standardised, but that is unfortunately not the case.  Today, machinery and vehicles use mainly metric thread, or Unified National Coarse (UNC) and Unified National Fine (UNF).  Other less common threads include British Standard Whitworth (BSW), British Standard Fine (BSF), American National Fine (ANF) and American National Coarse (ANC).

Pipes and fitting generally have their own specified thread types, including British Standard Pipe Thread (BSP) and National Pipe Thread (NPT).  BSPT (the T means the thread is tapered) is commonly used in all water pipe fittings today.

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  Solving the Thread Mystery