3M 26109, PPS Series 2.0 Adapter, Type S23, 1/4 Female, 18 Thread NPS, 7100135941 
Insize 7321-T14, SCREW THREAD POINT, 13-9TPI/2-3mm, pair, 6928640348495
$38.59
internal thread (60? thread angle)
SCREW THREAD POINT, 13-9TPI/2-3mm, pair
For use with Screw Thread Microsmeter Series # 3281
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