JBO Thread Ring Gauge (NoGo) - UNF - Left Hand - 2A - 1/4 x 28 G square-edge precision

square-edge precision

Its durable build and precise fit reduce rework

Teeth: 128 (fine-pitch geometry)

55 mm diameter with ISO H5 tolerance (D) per DIN 212-B

Left-hand spiral flute with straight shank: Provides controlled chip evacuation and stable alignment in typical reaming setups

JBO Thread Ring Gauge (NoGo) - UNF - Left Hand - 2A - 1/4 x 28 G square-edge precisionThe JBO Thread Ring Gauge (NoGo) is a precision tool engineered to verify external UNF threads. Specifically sized for 1 4 x 28 left hand threads in the 2A class, it helps inspectors quickly determine whether a threaded component is within tolerance or out of spec. This No Go gauge is ideal for shops and QC labs that rely on fast, reliable pass fail checks. UNF Left Hand No Go verification: Quickly confirms non conforming threads to prevent improper