All Socket Head Cap Screws are made of alloy steel, meet ASTM A574M and ASME B18.3.1M specifications, and have a minimum tensile strength of 176,946 P.S.I. (1,220 MPa). All products are made in the U.S.A. The following hex keys are required for each screw: the 3MM hex key (K-M No. 83-645), the 4MM hex key (K-M No. 83-646), the 5MM hex key (K-M No. 83-647), the 6MM hex key (K-M No. 83-648), the 8MM hex key (K-M No. 83-649), the 10MM hex key (K-M No. 83-650), the 14MM hex key (K-M No. 83-652), the 17MM hex key (K-M No. 83-653), and the 19MM hex key (K-M No. 83-654).

The Socket Head Cap Screw is made of alloy steel and meets ASTM A574M and ASME B18.3.1M specifications, with a minimum tensile strength of 176,946 P.S.I. (1,220 MPa). It is proudly made in the U.S.A. This screw requires different hex keys depending on the size: a 2.5MM Hex Key (K-M No. 83-644), a 3MM Hex Key (K-M No. 83-645), a 5MM Hex Key (K-M No. 83-647), a 6MM Hex Key (K-M No. 83-648), an 8MM Hex Key (K-M No. 83-649), a 10MM Hex Key (K-M No. 83-650), a 12MM Hex Key (K-M No. 83-651), a 14MM Hex Key (K-M No. 83-652), and a 19MM Hex Key (K-M No. 83-654). Additionally, there is a Class 12.9 variant of the screw, which is also made of alloy steel with a tensile strength of 176,100 P.S.I. and features a black oil-dipped finish.

Class 12.9, Alloy Steel - 176,000 P.S.I., Zinc Plated, increased corrosion resistance, superior appearance for motorcycle, automotive, and truck applications. Hex Key sizes range from 2.5MM to 8MM.