JBO Thread Ring Gauge (NoGo) - UNC - Right Hand - 3A - No. 4 x 40 RPTECH accurate hole finishing with stable

accurate hole finishing with stable cutting action

If you need a single

and improving surface finish across mold and die projects

84mm is a carbide-tipped reamer designed for taper-shank tooling

and coatings to match your exact requirements

JBO Thread Ring Gauge (NoGo) - UNC - Right Hand - 3A - No. 4 x 40 RPTECH accurate hole finishing with stableThe JBO Thread Ring Gauge (NoGo) is a precision tool designed to verify external UNC threads with a right hand orientation. Sized for No. 4 x 40 and 3A class, its ideal for manufacturing, automotive, and aerospace environments that require consistent, reliable thread checks. Built to support accurate measurements against Unified Thread Standards, this gauge helps ensure every threaded component fits and functions as intended. Crafted from hardened