Socket Head Cap Screw, Steel, M12 x 40, 100-PackBuild strong, serviceable joints using the Socket Head Cap Screw. Made of steel. The hex head accepts a wrench or socket for high clamp force and straightforward tightening. Threads engage smoothly to draw parts together and hold alignment. Use it for mounting hardware, framing, and equipment installs where strength matters. Built for reliable hold in everyday assembly work.