WEBStandard thread gages are made to a Class X tolerance. Gages may be purchased individually or as assemblies. Plug gage assemblies are marked with the thread size, class of fit and pitch diameters. Pipe Gages per ASME B1.20.1, ASME B1.20.5 and Hole Location gages stocked. ACME, Buttress, STI and gages for other custom thread forms are also ...