• Precision hex socket for maximum key engagement.
• Uniform 82° angle under head for maximum contact.
• Fully formed threads for greater strength and precision fit.
• Continuous grain flow throughout for increased strength.
• Heat treated alloy steel for maximum strength without brittleness or decarburization.
• Hardness: RC 37-44
• Tensile Strength: 145,000 P.S.I.
• Material: ASTM F835 - alloy steel
• Dimenstions: ANSI / ASME B18.3 (thread class 3A)

Note:

This Socket Head Cap Screw uses a 1/8" Hex Key [K-M No. 83-623]