JBO Thread Plug Gauge - Metric Coarse Go/No-Go - Left Hand - 5H - M1.2 x 0.25 Hex Key Drill Chuck With a broad range of

With a broad range of specifications—different sizes

while the H5 tolerance ensures tight

delivering consistent concentricity across milling and drilling operations

A 10-micron run-out specification helps keep your tools centered during high-speed operation

repeatable results that translate to higher first-pass success

JBO Thread Plug Gauge - Metric Coarse Go/No-Go - Left Hand - 5H - M1.2 x 0.25 Hex Key Drill Chuck With a broad range ofThe JBO Thread Plug Gauge is a precision Go No Go tool designed specifically for metric coarse threads. Its ideal for engineers, machinists, quality teams, and shop technicians who need fast, reliable verification that threaded holes meet spec for proper fit and function. This left hand version is sized for M1. 2 x 0. 25 with a 5H tolerance, helping you confirm correct engagement in assemblies that use left handed threads. Go No Go verification for