3M 26137, PPS Series 2.0 Adapter, Type S41, Trapezoidal Thread - QCC, 7100135947 
Insize 7381-T23, MEASURING TIPS FOR SCREW THREAD MICROMETER, 40-32TPI, 6928640306839
$29.06
Whitworth thread (55? thread angle).
Pitch: 40-32 TPI
55? thread angle
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