Engineering Stud M42x440x3Pitch APS 8.8 MF Spec

Engineering studs, also known as machine studs, are high-strength fasteners consisting of a metal rod with threads on both ends and a plain, unthreaded shank in the middle. They are used in machinery, engines (cylinder heads), and construction to provide, secure, and adjustable clamping force, often in heavy-duty or high-temperature applications.