JBO Thread Ring Gauge (GO) - UNJC - Right Hand - 3B - 1/4 x 20 FMH FLH FHH S&E A&NF M&D This reamer finishes drilled holes

This reamer finishes drilled holes to tight ISO H4 tolerance for consistent

and finer surface finishes

Spiral flute with straight shank for versatile mounting: Efficient chip evacuation reduces clogging and supports stable cutting

or producing small-batch components

Through-Coolant delivery for reliable cutting: coolant is fed through the tool to cool the cutting edge and help evacuate chips

JBO Thread Ring Gauge (GO) - UNJC - Right Hand - 3B - 1/4 x 20 FMH FLH FHH S&E A&NF M&D This reamer finishes drilled holesThe JBO Thread Ring Gauge (GO) UNJC Right Hand 3B 1 4 x 20 is a precision inspection tool used to verify external thread diameters against the UNJC standard. Its designed for engineers, quality teams, machinists, and inspectors to quickly validate parts meet the required thread size and tolerance. Crafted from hardened steel for standout durability, this 3B GO gauge delivers long lasting performance in busy workshops and production lines. The simple