ACME ANSI/ASME B1.5 & STUB ACME ANSI/ASME B1.8

Northern Gauge manufactures any size in both ACME and STUB ACME plug and ring gauges.  Class 2G is the standard fit.  Class 3G and 4G are tighter fits. All gages are 29 degree full angle.  Modified gauges are available upon request.