1999-2025 Harley-Davidson Big Twin / Softail / Touring / Dyna Inner Primary Mainshaft Seal

This inner primary mainshaft seal is designed to provide a secure, leak-proof barrier between the primary housing and the transmission. Engineered by Nightforge for long-lasting durability, the seal effectively keeps primary fluid contained while preventing external debris from entering critical drivetrain components. You can depend on this high-quality replacement to maintain the performance and cleanliness of your motorcycle's primary drive system.

This seal fits Harley-Davidson Big Twin, Softail, Touring, and Dyna models from 1999 to 2025.