JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 4h - M21 x 1 ER Mini Collet Chucks and improve cutting efficiency across

and improve cutting efficiency across demanding jobs

Built for reliable milling performance

The left-hand spiral flute and right-hand cutting deliver efficient material removal and a smooth bore

The combination of precise ISO tolerances

This model features a 25 mm size and a 120 mm long form factor

JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 4h - M21 x 1 ER Mini Collet Chucks and improve cutting efficiency acrossThe JBO Thread Ring Gauge (GO) Metric Fine, Right Hand M21 x 1 (4h) is a precision inspection tool for confirming external thread diameters. Ideal for quality control labs, production lines, and maintenance workshops, it provides a reliable go no go test that quickly verifies components meet the M21 x 1 standard and its 4h tolerance. Manufactured from hardened steel, it delivers long lasting wear resistance in busy environments. Its simple, intuitive