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Ships within 48 hours · Estimated delivery Aug 16 - Aug 21
Durable hardened steel construction: Built to endure daily shop use with excellent wear resistance
Left‑hand metric fine GO verification: Precisely checks external threads for M21 x 0
it combines left-hand spiral flutes with a right-hand cutting action for controlled chip flow and finish
5 balanced design to minimize runout and vibration
JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - 5/16 x 18 S&E Durable hardened steel construction: BuiltThe JBO Thread Plug Gauge is a precision inspection tool designed to verify internal threads in holes. Built for left handed UNC threads (5 16 x 18) and finished to Class 2B tolerance, it helps shops across manufacturing, automotive, and aerospace ensure threaded features meet Unified thread standards with reliable, repeatable checks. Its go no go design provides quick, clear pass fail feedback, so inspectors can confirm proper thread engagement at a
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