Wide clamping range with round-shank tooling: supports tools from 3–13 mm and requires round shanks (no clamping flats) to maintain a secure grip and seal
75 mm holes with high precision
delivering reliable performance across demanding materials
making it a versatile addition to any shop that performs precision slotting
and right‑hand cutting for efficient
JBO Thread Plug Gauge - UNJF Go-No/Go - Left Hand - 3B - 5/16 x 24 End Mill Holders Wide clamping range with round-shankJBO Thread Plug Gauge UNJF Go No Go, Left Hand, 3B, 5 16 x 24 is a precision inspection tool designed to verify internal threads quickly and reliably. Built for machinists, quality teams, and shops that service manufacturing, automotive, and aerospace components, this gauge helps ensure UNJF thread holes meet spec before assembly or production runs. Go No Go Verification for UNJF Threads: Quickly identify conforming vs. non conforming left handed