JBO Thread Ring Gauge (GO) - UNC - Left Hand - 2A - 1/4 x 20 G it offers long tool life

it offers long tool life and easy integration into existing machinery

helping you reject nonconforming parts without guesswork and speed up quality control

consistent results in mold and die work

you can rely on consistent results across jobs and operators

making it a straightforward upgrade to your workshop setup

JBO Thread Ring Gauge (GO) - UNC - Left Hand - 2A - 1/4 x 20 G it offers long tool lifeThe JBO Thread Ring Gauge GO for UNC Left Hand 1 4 x 20 (2A) is a precision inspection tool designed to quickly verify external thread diameters and confirm conformance with UNC standards. It serves engineers, machinists, inspectors, and quality teams across manufacturing and maintenance settings by delivering fast, reliable pass fail checks on threaded components. Manufactured from hardened steel for exceptional durability, this GO gauge withstands