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15mm is a high-precision finishing tool designed for through-hole work
accurate checks in both setup and in-process scenarios
minimize guesswork in thread acceptance
straight shank with left‑hand flute: Provides rigidity and stable cutting with minimal deflection
Left-hand spiral flute with right-hand cutting for efficient chip removal: This geometry improves chip evacuation and provides a smoother bore finish
JBO Thread Ring Gauge (GO) - BSF - Right Hand - Medium Class - 3/4 x 12 G 15mm is a high-precision finishingThe JBO Thread Ring Gauge (GO) BSF is a precision go gauge used to verify external BSF threads. Specifically designed for right hand, 3 4 x 12 threads in a Medium Class tolerance, it helps inspectors and machinists quickly confirm that a thread diameter falls within the Go limit. Crafted from hardened steel, this ring gauge stands up to regular use in demanding workshops, providing reliable wear resistance and long service life. Its simple, intuitive
