Hi! I'm in a situation with threads that are being torqued, and unthreaded, and then torqued again hundreds of times per day. While torqued they are required to lift thousands of pounds of load. We've experienced failures where the threads appear to have worn/galled to the point that they stripped out when lifting the load, which results in a serious failure. Some of the threads are tapered V-threads, others are straight square threads. How can I inspect the threads for wear? So far I've considered: 1. Use a normal go/nogo thread gauge. I'm not sure if they will catch a reduction in the major diameter if the pitch remains OK. 2. Measure the OD with a micrometer (or using a ring gauge). I think this would work for the straight buttress threads, but it isn't feasible for the tapered V-threads. 3. Use a thread profile gauge and visually identify wear. This seems to be the best option, but it requires some skill and isn't as "idiot proof" as I would like. Any recommendations?