3M 26141, PPS Series 2.0 Adapter, Type S44, 3/8 Female, 19 Thread BSP, 7100158892 
Insize 7381-T210, MEASURING TIPS FOR SCREW THREAD MICROMETER, 4.5-3.5TPI, 6928640306907
$29.06
Whitworth thread (55? thread angle).
Pitch: 4.5-3.5TPI
55? thread angle
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