JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - 5/16 x 18 S&E Coating/Surface: PVD coating option to

Coating/Surface: PVD coating option to enhance wear resistance and maintain cutting performance

20 mm—is a precision carbide reamer designed to finish pre-drilled holes with tight dimensional control

this end mill enables faster roughing passes and fewer tool changes thanks to its robust carbide core and coating

Durable hardened steel construction: Built to endure daily shop use with excellent wear resistance

this reamer aims to minimize rework and deliver consistent results across projects

JBO Thread Plug Gauge - UNC Go-No/Go - Left Hand - 2B - 5/16 x 18 S&E Coating/Surface: PVD coating option toThe 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