3M 26109, PPS Series 2.0 Adapter, Type S23, 1/4 Female, 18 Thread NPS, 7100135941 
Insize 4120-20, METRIC THREAD RING GAGE, GO, M20x2.5, 6928640341519
$72.81
Go and No-Go gages are supplied separately.
Class 6g.
Standard ISO1502.
Supplied with manufacturer inspection certificate.
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