JBO Thread Ring Gauge (GO) - UNC - Right Hand - 2A - No. 4 x 40 Milling Cutter Arbors controlled reaming and repeatable hole

controlled reaming and repeatable hole finishes

29 mm diameter is built for accuracy

you can achieve dependable

finished with a hard

and right-hand cutting deliver reliable guidance and a clean bore in DIN 212-B applications

JBO Thread Ring Gauge (GO) - UNC - Right Hand - 2A - No. 4 x 40 Milling Cutter Arbors controlled reaming and repeatable holeThe JBO Thread Ring Gauge (GO) for UNC external threads is a precision inspection tool designed for machinists, quality teams, and assembly technicians. Sized for No. 4 x 40 with a right hand thread and 2A class accuracy, it enables fast, reliable verification of external thread diameters to UNC standards. Whether youre on a production line, in a workshop, or in a quality lab, this GO gauge helps confirm that parts will thread correctly and assemble