JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M55 x 4 End Mill Holders this left-hand GO gauge helps

this left-hand GO gauge helps machinists

The carbide construction stands up to tougher alloys

you’ll experience improved workflow: tighter run-out means cleaner cuts and more consistent finishes

improving durability and enabling access to tight pockets in molds and dies

powered by a hardened carbide cutting edge achieved through an optimized rake angle to deliver strong performance and extended tool life

JBO Thread Ring Gauge (GO) - Metric Fine - Right Hand - 6g - M55 x 4 End Mill Holders this left-hand GO gauge helpsThe JBO Thread Ring Gauge (GO) Metric Fine Right Hand 6g M55 x 4 is a precision tool designed to verify external thread diameters with consistency. Its ideal for machinists, quality control professionals, engineers, and maintenance teams who need quick, reliable checks to ensure components meet exact specifications. Crafted from hardened steel with a knurled outer edge for a secure grip, this GO ring gauge resists wear in busy workshop environments