JBO Thread Ring Gauge (GO) - Metric Coarse - Left Hand - 6g - M12 x 1.75 FMH Diameter x Length: 8 mm

Diameter x Length: 8 mm diameter with 100 mm overall length

This reamer delivers precise bore sizing with a smooth finish for metalworking projects that demand tight tolerances

41 mm with a straight shank and spiral flute

It’s built for engineering teams

consistent results across detailed work—from delicate engravings to complex 3D surfaces

JBO Thread Ring Gauge (GO) - Metric Coarse - Left Hand - 6g - M12 x 1.75 FMH Diameter x Length: 8 mmThe JBO Thread Ring Gauge GO for Metric Coarse (Left Hand) is a precision inspection tool designed to verify external threads quickly and accurately. Its ideal for engineers, machinists, inspectors, and quality teams who need to confirm that M12 x 1. 75 metric coarse threads meet exact specifications so assemblies fit reliably. Crafted from hardened steel for durability and wear resistance, this GO ring gauge preserves its precise dimensions through