Although anyone can get de Quervain's tenosynovitis, it affects women eight to 10 times more often than men. It may happen in the time just after pregnancy. Symptoms. Pain along the back of the thumb, directly over two thumb tendons, is common in de Quervain's. The condition can happen gradually or start suddenly. In either case, the pain may travel into the thumb or up the forearm.
This is the number of complete threads occurring in one inch of threaded length. Metric thread pitch is. designated as the distance between threads (pitch) in millimeters. On an internal thread, the minor diameter occurs at the crests and the major diameter occurs at. the roots. On an external thread, the major diameter is at the thread crests, and the minor diameter. is at the thread roots. The flank angle is the angle between a flank and the. perpendicular thread axis.
Best Answer: National fine. This is a series of tap pitches. NC is National Course pitch. The pitch is the distance between the tops of the thread. (M) Just like the distance in the V of the M, the number signifies the number of threads per inch. Threads per Inch is referred to as T.P.I. and the 1/4 value is the Outside most diameter, so the hole to be tapped must therefore be smaller. If one is using a 1/4-28 tap the hole diameter drilled should be .211/.216 diameter.