3M 26102, PPS Series 2.0 Adapter, Type S16, 3/8 Female, 19 Thread BSP, 7100135934 
Insize 4120-18, METRIC THREAD RING GAGE, GO, M18x2.5, 6928640341502
$70.70
Go and No-Go gages are supplied separately.
Class 6g.
Standard ISO1502.
Supplied with manufacturer inspection certificate.
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