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> 5/16-18 x 1" socket head cap allen screws 13 pieces
5/16-18 x 1" socket head cap allen screws 13 pieces
5/16-18 X 1" Socket Head Cap Allen Screws 13 Pieces Condition Used Good Black Oxide Finish
American Society for Testing and Materials (ASTM)
The standard among high-strength fasteners, these screws are made from an alloy steel that's comparable to Grade 8 steel and conforms to ASTM A574. They have a black-oxide finish that provides lubricity and mild rust resistance.
Screw sizes through 1" have a Class 3A thread fit; screw sizes larger than 1" have a Class 2A thread fit.
Screw sizes through 1/2" have a minimum Rockwell hardness of C39 and minimum tensile strength of 180,000 psi; screw sizes larger than 1/2" have a minimum Rockwell hardness of C37 and minimum tensile strength of 170,000 psi. Screw length is measured from under the head.
