JBO Thread Ring Gauge (NoGo) - Metric Fine - Right Hand - 6g - M4 x 0.5 Face Mill Arbors - Through Coolant built to DIN 212-B specifications

built to DIN 212-B specifications

Edge geometry: 180° cutting edge creates a true flat-bottom counterbore for uniform recess depths

accurate hole finish with reduced chatter

repeatable seating: G2

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

JBO Thread Ring Gauge (NoGo) - Metric Fine - Right Hand - 6g - M4 x 0.5 Face Mill Arbors - Through Coolant built to DIN 212-B specificationsThe 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