3M 26018, PPS Series 2.0 Adapter, Type S11, 3/8 Male, 18 Thread NPS, 7100135942 
Insize 7382-1S, 3-WIRES, 18 pairs/set, 6928640361883
$4,123.44
Used with standard outside micrometers with spindle .25″DIA to measure pitch diameter of screw threads.
Diameter accuracy: ?20_in. Cylindricity: 39_in.
Cylindricity: 1um. Hardness: HRC60.
Supplied with manufacturer inspection certificate.
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