JBO Thread Ring Gauge (NoGo) - BSW - Right Hand - Medium Class - 1/2 x 12 Endmill25 2-flute design and a versatile

2-flute design and a versatile diameter range

or non‑ferrous materials

When paired with compatible GSK collets

and hobbyists who demand dependable accuracy

JBO Thread Ring Gauge (NoGo) - BSW - Right Hand - Medium Class - 1/2 x 12 Endmill25 2-flute design and a versatileJBO Thread Ring Gauge (NoGo) BSW Right Hand Medium Class 1 2 x 12 is a precision tool for verifying external thread diameters. Ideal for manufacturers, automotive and aerospace shops, as well as QA teams, it helps ensure threaded components meet Unified thread standards through accurate size checks. The NoGo design provides a quick, unmistakable indication of non conforming threads, helping you confirm proper fitment before assembly. Crafted from