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.
Lead (L) â The distance the nut moves parallel to the screw axis when the nut is given one turn. TPI (n) â The number of Threads Per Inch, related to the pitch by 1/ pn = . Root (minor) Diameter â Smallest diameter of screw-d r. Major Diameter â Largest diameter of screw-d c (sometimes designated as d). Mean (pitch) Diameter â Average diameter of screw-d m (sometimes designated as d p). Lead Angle (Î») â The angle defining the inclination of the thread (see figure below). Helix Angle (Ï) â The angle between the thread axis and the lead angle (ÏÎ»+=90 o).