JBO Thread Ring Gauge (GO) - UNF - Right Hand - 3A - 1 3/8 x 12 Face Mill Arbors - Through Coolant this tool supports faster workflows

this tool supports faster workflows and consistently high-quality results

Durable seal design and proper tooling compatibility: Newer models use a metal nose seal for longer life

delivering reliable performance across multiple passes and complex geometries

and BS 328/4 compliance help ensure compatibility with common reaming setups

repeatable results for precision workshops and job shops

JBO Thread Ring Gauge (GO) - UNF - Right Hand - 3A - 1 3/8 x 12 Face Mill Arbors - Through Coolant this tool supports faster workflowsThe JBO Thread Ring Gauge (GO) UNF is a precision go gauge designed to verify external threads on righthand UNF components. Sized for 1 3 8" diameter with 12 threads per inch and 3A tolerance, its built for machinists, inspectors, and quality teams who need fast, reliable pass fail checks. Crafted from hardened steel with a knurled outer edge, this gauge is ready for everyday use in busy shops and field service environments. Go No Go verification for