Gauging Pipe Threads Sealing Pipe Threads 'R' Series AS 1722 Part 1 and ISO 7 (Formerly B.S.P.T.)
Thread is always tapered.
External component is always gauged with tapered full form screw ring gauge (Step Limit).
Thread may be tapered (right) or parallel (below).
Internal sealing pipe treads, either tapered or parallel are gauged with full form taper screw plug gauges (step limit).
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