3M 26120, PPS Series 2.0 Adapter, Type S28, 17.5 mm Female, 19 TPI
Thread, 7100135956 
Dynabrade 98270 1/2" Male Coupler 
Insize 4131-1B1, AMERICAN STANDARD THREAD PLUG GAGE, 1/4-20UNC, 6928640358944
$87.51
Class 2B.
Standard ANSI/ASME B1.2
Supplied with Go and No-Go gages together
Supplied with manufacturer inspection certificate.
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