MASON Socket Set Screw – Cup Point

A set screw is a type of screw generally used to secure an object within or against another object, normally not using a nut (see bolts compared with screws). The most common examples are securing a pulley or gear to a shaft. Set screws are usually headless (also called blind), meaning that the screw is fully threaded and has no head projecting past the major diameter of the screw thread. If a set screw has a head, the thread will extend all the way to the head (whereas a bolt might have an unthreaded shank between the head and thread).


D (DIAMETER) 3/16(#10) 1/4 5/16 3/8 1/2C
P (PICTH) 24 20 18 16 13
DV 2.3-2.5 3-3.3 4-4.3 4.9-5 6.9-7.3
3/32 1/8 5/38 3/16 1/4