3M 26054, PPS Series 2.0 Adapter, Type S18, 3/8 Female, 18 Thread NPS,
4 per case 
Insize 4120-39N, METRIC THREAD RING GAGE, NO GO, M39x4, 6928640341892
$125.78
Go and No-Go gages are supplied separately.
Class 6g.
Standard ISO1502.
Supplied with manufacturer inspection certificate.
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