Chemical composition of set screws
The following table contains information on the chemical composition of set
screws per property class. Set
screws shall be made of steel conforming to the requirements specified below.
For property class 45H, other materials may be used provided that the torque
test requirements are met.
1) Free-cutting steel may be used, with lead content
0.35% max., phosphorus content 0.11% max., and sulfur content 0.34% max.
2) Case hardening is allowed in the case
of square-head set screws.
3) Steel with lead content 0.35% max. may be
used.
4) Shall contain one or more of alloying elements chromium, nickel,
molybdenum, vanadium or boron.