3M 26116, PPS Series 2.0 Adapter, Type S25, 1/4 Female, 19 Thread BSP, 7100135957 
Insize 7381-T24, MEASURING TIPS FOR SCREW THREAD MICROMETER, 32-24TPI, 6928640306846
$29.06
Whitworth thread (55? thread angle).
Pitch: 32-24TPI
55? thread angle
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