JBO Thread Ring Gauge (GO) - BSF - Right Hand - Medium Class - 9/16 x 16 ER Collet Chucks and a lower total cost

and a lower total cost of ownership for both professional shops and serious hobbyists working with mold- and die-grade steels

The combination of a left‑hand spiral flute and straight shank supports reliable alignment and efficient chip evacuation in reaming operations

speeding up QA workflows

and finished to ISO H5 tolerance for precise bore dimensions

repeatable grip on round shank tools for reliable results across jobs

JBO Thread Ring Gauge (GO) - BSF - Right Hand - Medium Class - 9/16 x 16 ER Collet Chucks and a lower total costThe JBO Thread Ring Gauge (GO) for BSF is a precision go gauge used to verify external thread diameters on components with British Standard Fine threads. Built for right hand threads and a Medium Class tolerance (9 16 x 16), it helps quality teams quickly confirm conformance to standards and ensure proper fit in assemblies. Crafted from hardened steel, the gauge delivers durability and wear resistance in busy workshop environments. Its meticulous