517920 Nut, crankpin. 54-E81 XL

When rebuilding an Ironhead Sportster bottom end, using fresh hardware is non-negotiable for a reliable result. These crankpin nuts feature a 1-inch by 20 thread pitch and are manufactured to replace OEM 23967-54A. They are sold as a pair, providing both nuts needed to secure the crankpin to the flywheels. These are designed specifically for 1954 through early 1981 XL Sportster models. Proper torque and thread integrity are critical in the high-vibration environment of a Sportster engine, and these replacement nuts offer the reliability you need to button up your cases with confidence, knowing your rotating assembly is secured to factory standards.