In high-vibration environments, standard hex bolts work loose over time. JLHY's serrated flange bolts solve this with a built-in locking feature — gear-like teeth on the flange underside bite into the mating surface when tightened, creating a micro-interlock that refuses to rotate under vibration. No separate lock washer is needed.

The serrated flange face distributes clamping pressure over a greater area than a standard hex head, reducing surface stress on the connected material. Produced from Grade 8.8 or 10.9 carbon steel with zinc plating. The precision-machined serrated teeth ensure reliable locking on every installation.

Preferred for engine manifold applications, exhaust systems, structural connections in vibrating equipment, and anywhere bolted joints must survive constant motion. Matching serrated flange nuts available. Contact JLHY for specifications and technical support.