Shear Bolt

A shear head bolt (often just called a shear bolt in that context) and a shear pin are fasteners intentionally designed to fail in shear at a predetermined load or torque to protect more critical components.A shear head bolt typically has a drive section (like a hex head) that snaps off once a set torque is reached, or the bolt itself is sized/material‑selected so it will shear under excess load, leaving the rest of the joint intact; this is used both for tamper‑resistant security fixings and for overload protection in machinery.A shear pin is a straight pin or small bolt used as a deliberate mechanical “fuse” in rotating or load‑bearing assemblies (such as snow blowers, augers, agricultural equipment, or some aircraft mechanisms) that will shear cleanly when torque or load exceeds the design limit, disconnecting the drive and preventing more expensive damage.

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