Reference standards for BS 21 tapered pipe threads are:
Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.
Thread data - metric, unified, ACME and others.
NPS pressure tight straight pipe threads with lubricant or sealer.
NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3.
Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads.
Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.
Metric threads spark plugs according ISO 28741.
Pressure-tight joints made on the pipe threads.
Dimensions of metric threads according ISO 724.
Applied threaded standards used for piping connections.
Piping thread standards.
ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series.
BSPP (G) - British Standard Pipe Parallel and BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - G/R/Rp.
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