100726 Febi Close-tolerance bolt

Febi's Close-tolerance bolt is a high-quality engine component designed for precise applications. It is commonly used in the valve rod and rocker area within the engine. This product benefits from its internal multi-spline head type, which increases torque holding power and minimizes the risk of thread damage. The phosphated surface finish also contributes to improved durability by reducing corrosion. Valve rods and rockers are critical components of an engine’s valve train, translating rotational motion of the camshaft into linear motion to open and close intake and exhaust valves. Rocker arms pivot on a fulcrum, amplifying camshaft lift and transferring it to the valve stem via the valve rod (or pushrod in OHV engines). These components are located within the cylinder head and engine block, operating in a high-temperature, high-stress environment. Manufacturing typically utilizes hardened steel alloys for durability and resistance to wear. Precise machining and heat treatment are essential for maintaining valve timing and engine performance. Variations include roller rockers to reduce friction and different length pushrods to accommodate aftermarket camshafts.