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Edge geometry: 180° cutting edge creates a true flat-bottom counterbore for uniform recess depths
Use it to achieve accurate diameters and reliable hole quality in a variety of metals and alloys
ensure proper thread engagement
it is built to BS 328/4 and holds ISO H5 tolerance for tight size control
accurate hole finish with reduced chatter
JBO Thread Ring Gauge (NoGo) - Metric Fine - Right Hand - 6g - M4 x 0.5 Face Mill Arbors - Through Coolant Edge geometry: 180° cutting edgeThe JBO Thread Ring Gauge (NoGo) is a precision tool for verifying external metric threads, specifically M4 x 0. 5, in a compact ring gauge format. Its ideal for engineers, machinists, quality inspectors, and assembly teams who need fast, reliable thread checks against standard specifications. Designed for tough shop environments, the gauge features hardened steel construction, right hand orientation, and metric fine tolerance (6g). This combination
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