476 Screw Pitch Gauge tpi 3.1/2 - 60
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.
Whitworth Standard - 55° Threads
No. of leaves: 30
TPI Range: 3 1/2 - 60
With positive stop.