JBO Thread Ring Gauge (NoGo) - Metric Coarse - Right Hand - 6h - M42 x 4.5 FHH HSS (M2) — is an

HSS (M2) — is an intermediate precision tool designed to deliver accurate hole sizing in metalworking

Efficient 2-Flute Design for Chip Evacuation: The two-flute configuration promotes quick chip clearance

13 mm bore with repeatable size control

and reduced downtime across precision milling and small-tool applications

The combination of HSS (M2) material and a left-hand spiral flute with right-hand cutting provides durable performance and controlled material removal in manual reaming tasks

JBO Thread Ring Gauge (NoGo) - Metric Coarse - Right Hand - 6h - M42 x 4.5 FHH HSS (M2) — is anThe JBO Thread Ring Gauge (NoGo) Metric Coarse, Right Hand, 6h, M42 x 4. 5 is a precision tool designed to verify external threads quickly and reliably. Made from hardened steel, it withstands daily wear in workshop environments while maintaining stable, repeatable measurements. Designed for quality control professionals, machinists, and maintenance teams, this NoGo gauge helps confirm that M42 x 4. 5 coarse threads meet the specified maximum