3M 26116, PPS Series 2.0 Adapter, Type S25, 1/4 Female, 19 Thread BSP, 7100135957 
Insize 7321-T16, SCREW THREAD POINT, 4.5-3.5TPI/5.5-7mm, pair, 6928640348518
$38.59
internal thread (60? thread angle)
SCREW THREAD POINT, 4.5-3.5TPI/5.5-7mm, pair
For use with Screw Thread Microsmeter Series # 3281
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