Large O-Ring for Billet Hub

The large O-ring for billet hub from Diversified Machine is a precision sealing component engineered for high-performance drive flange applications. If you're building or maintaining a custom automotive drivetrain—whether upgrading a street rod, race car, or performance truck—this O-ring ensures a leak-free, reliable seal at critical connection points. Billet hubs demand precision-grade elastomers to maintain system integrity under load, vibration, and thermal cycling that standard OEM rubber cannot always handle.

This large O-ring features a 4-inch inner diameter and 4.125-inch outer diameter with a 0.0625-inch cross-section thickness, delivering the compression and elasticity required for drive flange sealing. Manufactured from durable black rubber, the design accommodates the precise tolerances of billet hub assemblies while resisting oil, coolant, and fuel exposure. The thickness and diameter ratio ensure proper squeeze when installed in a groove, maintaining dynamic and static seals even under sustained pressure and engine bay temperatures typical of modified powerplants.

Builders and mechanics working with aftermarket billet hubs—common in custom differentials, transmissions, and transfer case applications—will find this O-ring essential for leak prevention and component longevity. It's equally valuable when restoring a failed seal or upgrading from inferior OEM rubber to a performance-grade alternative. Installation is straightforward: ensure the groove is clean and dry, seat the O-ring evenly, and apply a thin layer of assembly lube before mating components to avoid twisting or tearing during assembly.