JBO Thread Ring Gauge (NoGo) - Metric Fine - Right Hand - 6g - M4 x 0.5 Face Mill Arbors - Through Coolant while the carbide edge resists

while the carbide edge resists wear

Precise Contouring with Ball Nose: Ball nose geometry delivers smooth

it is built to BS 328/4 and holds ISO H5 tolerance for tight size control

enabling fast tool changes and reducing downtime

Use it to achieve accurate diameters and reliable hole quality in a variety of metals and alloys

JBO Thread Ring Gauge (NoGo) - Metric Fine - Right Hand - 6g - M4 x 0.5 Face Mill Arbors - Through Coolant while the carbide edge resistsThe 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