JBO Thread Ring Gauge (GO) - UNC - Right Hand - 2A - 1/2 x 13 M&D tight-tolerance bores across a range

tight-tolerance bores across a range of metals

Sturdy 4‑flute rigidity: Four flutes deliver stability and reduced vibration

maintaining measurement accuracy over time and providing long service life in demanding environments

and steadier quality in threaded assemblies

UNF 5/8 x 18 right-hand

JBO Thread Ring Gauge (GO) - UNC - Right Hand - 2A - 1/2 x 13 M&D tight-tolerance bores across a rangeThe JBO Thread Ring Gauge (GO) for UNC, Right Hand, 2A, 1 2 x 13 is a precise inspection tool designed to verify external threads on fasteners and machined parts. Ideal for machinists, inspectors, and quality teams, it provides a quick, reliable go no go check to confirm parts meet the 1 2 13 UNC right hand thread specification. Built from hardened steel and finished for durability, this GO ring gauge resists wear in busy workshops and maintains