Engineered for demanding hydraulic piston applications, our Buna-N (NBR) T-Seal delivers reliable bi-directional sealing in a compact, low-friction profile. The T-shaped cross-section — combined with energizing back-up rings — eliminates extrusion under high pressure while maintaining consistent contact force across the full stroke.
Key Features
Material: Buna-N (Nitrile Rubber / NBR) — excellent resistance to petroleum-based hydraulic fluids, oils, and fuels
Seal Profile: T-shaped cross-section with integrated back-up ring grooves for anti-extrusion protection
Bi-Directional Sealing: Seals pressure from both directions — ideal for double-acting piston cylinders
Low Friction: Smooth dynamic sealing surface reduces stick-slip and extends cylinder service life
Wide Temperature Range: Rated from -40°F to +250°F (-40°C to +121°C)
Pressure Rating: Suitable for operating pressures up to 5,000 PSI (with appropriate back-up rings)
Typical Applications
Hydraulic cylinders (double-acting pistons)
Mobile hydraulics — construction, agricultural, and material handling equipment
Industrial hydraulic presses and actuators
OEM and MRO replacement sealing
Why T-Seals?
Unlike standard O-rings, T-Seals are purpose-built for piston grooves where extrusion resistance and consistent sealing under dynamic cycling are critical. The T-profile self-centers in the groove, reducing installation errors and improving seal longevity in high-cycle applications.
