491 DIN Rotary Internal Single Seal (Global)
High-Performance Seal for Versatile Applications
Progressive Sealing offers the Chesterton 491 DIN, a reliable single rotary component seal engineered for flexibility and durability. Its non-fretting design protects shaft sleeves and metal parts, while a balanced O‑ring with anti‑clog features keeps the seal clean and functional. The seal is spring-energized out of the fluid, maintaining a stable, smooth O‑ring operation. Available in sizes from 16 mm to 110 mm, the 491 handles pressures from full vacuum to 10 bar (150 psig), temperatures ranging from –55 °C to 300 °C, and speeds up to 20 m/s—making it a solid choice across general industrial applications.
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Product Features
✔ This high-performance, single rotary seal is capable of addressing a wide variety of applications.
✔ The Chesterton 491 can be run against many different stationary seal rings for maximum flexibility in many applications. The non-fretting design will not destroy the shaft sleeve or any metal parts. The 491 has a balanced O-Ring design with anti-clog features, springs out of the fluid, dynamic O-Ring moves on a clean surface.
5 key seal design features
✔ Balanced Design
✔ Non-Fretting
✔ Monolithic Seal Faces
✔ Stationary Design
✔ Protected Springs
Technical Data ↓
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16 mm to 110 mm
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711 mm (28") Hg Vacuum to 10 bar g (150 psig)
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-55 to 300 °C (-67 to 570 °F)
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20 m/s ( 4000 fpm )