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Pipe taps cut pipe threads (tapered PT/NPT/BSPT, parallel PS/NPS/BSPP) for sealing and joining fittings, connectors and hydraulic/pneumatic piping. Tapered pipe taps have a tapered body to form a sealing tapered internal thread. Choose by pipe-thread standard (metric/imperial, tapered/parallel); set tap-drill size and depth per the standard. Mainly HSS. Confirm the pipe-thread system (PT, NPT, BSPT…) matches the mating part for sealing and interchangeability.