Industrial Heli-Coil 3694-5 Go-No-Go Thread Plug Gage for STI UNF-3B 16-24 threads, with a Go size of 0.3395 in and a No-Go size of 0.3421 in. It is used to verify internal threads by providing a go limit that should pass and a no-go limit that should not pass if the threads are within tolerance. This gauge is intended for use in machining, assembly, and quality-control workflows requiring UNF-3B 16-24 thread verification. The part is identified by model 3694-5 from Heli-Coil, matching STI UNF-3B specifications.
