O-Ring 2-028 Buna

The O-Ring 2-028 Buna from Penske Racing Shocks is a precision elastomer seal designed for high-performance suspension systems. Manufactured from Buna N (nitrile) compound, this seal delivers reliable performance in demanding racing and motorsport applications where consistent fluid containment and pressure retention are critical to shock absorber function.

Buna N material is engineered to resist mineral oils, petroleum-based fluids, and the thermal cycling common in high-performance shock systems. The 2-028 specification denotes a size-specific seal designation used across Penske's shock kit configurations. At 0.03 lbs with compact cross-sectional dimensions, this O-ring functions as a wear ring or piston seal within the shock assembly, where it maintains internal pressure differentials during compression and rebound cycles. Proper O-ring condition directly affects damping consistency—deterioration leads to fluid weeping, loss of damping force, and inconsistent suspension response on track.

This seal is essential for rebuilding, servicing, or maintaining Penske Racing Shocks suspensions used in circle track racing, road course competition, and off-road motorsport. Replacement during shock rebuild intervals ensures system integrity and restores original damping performance. The O-Ring 2-028 Buna is a direct fit for Penske kit applications and should be installed with proper fluid and assembly practices to avoid premature wear.

For racers and suspension builders working with Penske systems, genuine OEM seals like this 2-028 Buna O-ring are critical spare parts. Keep replacement seals in stock for routine maintenance and emergency rebuilds to minimize downtime between events.