JBO Thread Ring Gauge (GO) - UNF - Left Hand - 2A - 1 1/8 x 12 Face Mill Arbors M55 x 3 (Right‑Hand): Quickly

M55 x 3 (Right‑Hand): Quickly verify that threaded holes meet the 6H standard

With secure tool clamping

Bore: 1" bore compatible with standard milling machine arbors

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

Secure tool retention: Keeps the cutting insert firmly in place under load to minimize movement

JBO Thread Ring Gauge (GO) - UNF - Left Hand - 2A - 1 1/8 x 12 Face Mill Arbors M55 x 3 (Right‑Hand): QuicklyThe 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