JBO Thread Ring Gauge (GO) - UNF - Left Hand - 2A - 1 1/8 x 12 Face Mill Arbors these HSS-E reamers balance reliability

these HSS-E reamers balance reliability with versatility across a wide range of materials

wear-resistant ring gauge that maintains dimensional integrity through repeat use in busy workshops

The straight shank ensures straightforward integration with common chucks and holders

narrow slots with a clean edge

helping you reduce deflection and rework while delivering consistent hole sizes across batches

JBO Thread Ring Gauge (GO) - UNF - Left Hand - 2A - 1 1/8 x 12 Face Mill Arbors these HSS-E reamers balance reliabilityThe JBO Thread Ring Gauge (GO) for UNF left hand threads, size 1 1 8 x 12, is a precision inspection tool designed to verify external thread diameters quickly and reliably. Built for engineers, machinists, quality inspectors, and shop technicians, it enables fast conformance checks against UNF specifications in size class 2A. Precise GO gauge for UNF external threads: Provides accurate diameter verification for left hand threads, helping you confirm