JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M39 x 3 Face Mill Arbors Radius end geometry for smooth

Radius end geometry for smooth contouring: Provides precise profiling

more uniform surface finish on stainless and exotic metals

Left-hand spiral flute with right-hand cutting: Promotes efficient chip evacuation and predictable cutting action for smoother bore finishes

HSS‑E cobalt steel (M35)": Delivers enhanced wear resistance and longer tool life in demanding materials thanks to the cobalt-enriched alloy

while the M2 HSS construction stands up to repeated use in common metals

JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M39 x 3 Face Mill Arbors Radius end geometry for smoothThe JBO Thread Ring Gauge (GO) Metric Fine Right Hand 6g M39 x 3 is a precision tool designed to verify external thread diameters and pitches quickly and reliably. Its ideal for engineers, machinists, inspectors, and quality teams who need clear go no go checks to confirm parts meet standard specifications. Made from hardened steel for durability, this GO ring gauge stays accurate through repeated use in busy shops and QC labs. Its right hand