Starrett 6 Screw Pitch Gauge tpi 4-42Starrett
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Screw pitch gauges quickly determine the pitch of various external and internal threads. These gauges consist of a substantial steel case with a number of folding leaves at both ends, each leaf having teeth corresponding to a definite pitch.American national - 60° threadsNo. of leaves: 30TPI range: 4 - 42Locking device.