JBO Thread Ring Gauge (GO) - Metric Fine - Left Hand - 6g - M18 x 0.5 ER Collet Chucks and its left-hand spiral flute

and its left-hand spiral flute with right-hand cutting promotes efficient chip evacuation and a clean bore finish

The tapered neck improves clearance in tight features

helping to keep your workflow steady and downtime minimal

Using this gauge speeds up threaded-assembly QC

reducing dwell marks and improving finish quality on finished holes

JBO Thread Ring Gauge (GO) - Metric Fine - Left Hand - 6g - M18 x 0.5 ER Collet Chucks and its left-hand spiral fluteThe JBO Thread Ring Gauge (GO) for Metric Fine threads is a precision inspection tool designed to verify external thread diameters and pitch. It helps engineers, machinists, and quality teams quickly determine whether a threaded part meets the required M18 x 0. 5 metric fine standard. This left hand variant is built from hardened steel for durability in busy workshops, delivering reliable go no go results even in demanding environments. Its design