3M 26016, PPS Series 2.0 Adapter, Type S9, 16 mm Male, 1.5 mm Thread, 7100135330 
Insize 7381-T2S, MEASURING TIPS FOR SCREW THREAD MICROMETER, 10 pairs/set, 6928640306914
$285.16
Whitworth thread (55? thread angle).
10 pairs/set
55? thread angle
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