JBO Thread Plug Gauge - UNJF Go-No/Go - Left Hand - 3B - 3/8 x 24 Hydraulic Expansion Chucks clean ribs: The square edge

clean ribs: The square edge and rib‑processing geometry deliver precise

The uncoated finish aids chip flow and reduces friction

which translates to consistent tool performance across multiple passes and fewer tool changes in production environments

delivering controlled material removal and a smooth bore finish

enabling smoother finishes and faster cycle times

JBO Thread Plug Gauge - UNJF Go-No/Go - Left Hand - 3B - 3/8 x 24 Hydraulic Expansion Chucks clean ribs: The square edgeThe JBO Thread Plug Gauge is a precision inspection tool built to verify UNJF (Unified Fine) threads in left hand holes. Its ideal for manufacturers, automotive shops, aerospace assemblies, and precision workshops that rely on quick, reliable go no go checks for 3 8 x 24 threads in class 3B. With its compact, dual ended design, you can test both the minimum and maximum limits with one instrument, keeping your workflow efficient. This gauge is designed