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Pipe taps cut pipe threads for sealing and joining fittings, connectors and hydraulic/pneumatic piping. This category covers British pipe threads—tapered PT (Rc, aka BSPT), parallel PS (Rp) and PF (G, aka BSPP)—and American tapered NPT/NPTF and parallel NPS. Tapered pipe taps form a sealing tapered internal thread. Choose by pipe-thread standard; set tap-drill size and depth per the standard. Mainly HSS. Confirm the pipe-thread system matches the mating part for sealing and interchangeability.