JBO Thread Plug Gauge - UNJF Go-No/Go - Left Hand - 3B - 3/8 x 24 Hydraulic Expansion Chucks while the made-to-order production model

while the made-to-order production model ensures you receive a tool built to exacting standards for your application

delivering controlled material removal and a smooth bore finish

5 for reliable go/no-go decisions

it provides reliable dimensional control and extended tool life

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

JBO Thread Plug Gauge - UNJF Go-No/Go - Left Hand - 3B - 3/8 x 24 Hydraulic Expansion Chucks while the made-to-order production modelThe 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