JBO Thread Plug Gauge - UNF Go-No/Go - Right Hand - 2B - No. 12 x 28 FMH The carbide construction provides wear

The carbide construction provides wear resistance and longer tool life when machining hardened steels

interchangeable hole diameters across parts and setups

accurately sized holes with reliable repeatability

ISO H5 tolerance (DIN 212‑B): Ensures precise

1-flute tool is built for both hobbyists and professionals who demand dependable performance in router work

JBO Thread Plug Gauge - UNF Go-No/Go - Right Hand - 2B - No. 12 x 28 FMH The carbide construction provides wearThe JBO Thread Plug Gauge is a precision internal thread gauge designed to verify UNF holes with speed and accuracy. Built for engineers, inspectors, machinists, and maintenance teams across manufacturing, automotive, and aerospace, it ensures threaded holes meet the Unified Thread Standard. It features go no go ends and a rugged knurled body for fast checks in busy workshops. Go No Go end design: Quickly determine if the internal threads pass or fail