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it combines left-hand spiral flutes with a right-hand cutting action for controlled chip flow and finish
Left‑hand spiral flute with right‑hand cutting: aids chip control and delivers smooth
Left‑hand metric fine GO verification: Precisely checks external threads for M21 x 0
repeatable accuracy
By providing a durable
JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - 5/16 x 18 S&E it combines left-hand spiral flutesThe 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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