JBO Thread Plug Gauge - Metric Coarse Go/No-Go - Left Hand - 6H - M39 x 4 S&E easy-to-control profile designed for steady

easy-to-control profile designed for steady handling in handheld tools or CNC setups

Precise DIN 8051 B / ISO H5 tolerance: Tight size control ensures consistent fits and reliable performance across repeated reaming tasks

and corner radii in precision components

Length: Extra-long length enables access to deep cavities and hard-to-reach features

16 mm carbide-tipped tool designed to finish holes with tight tolerances

JBO Thread Plug Gauge - Metric Coarse Go/No-Go - Left Hand - 6H - M39 x 4 S&E easy-to-control profile designed for steadyThe JBO Thread Plug Gauge is a precision inspection tool for metric coarse threads. With left hand Go No Go operation and an M39 x 4 hole size, its ideal for quality checks, assembly verification, and maintenance. Crafted from hardened steel, it stands up to daily shop use and maintains accuracy over time. Go No Go accuracy for fast inspection: Quickly verify whether a threaded hole meets spec, delivering clear pass fail results to speed up QC and