Chesterton S20 Dual Tandem Cassette Seal

Chesterton S20 Tandem Cassette Double Seal
High-Performance Modular Cassette Seal

​​​​​​​​​This tandem seal uses a high-flow pump device, which assists in heat removal. The tandem configuration is engineered for high-pressure sealing. All wearing parts are contained in a single, replacement cassette unit. With a common universal gland, repair is a simple matter of exchanging cassettes.

​Now available with Chesterton ViewIn Technology! Learn more.​

Download 3D and 2D CAD Models for Chesterton S20:

(Free sign-up required on 3D ContentCentral)​

Chesterton S20 Cassette Seal with ViewIn
Advanced sealing performance
One optimized sealing concept for plant-wide standardization
Double mechanical seal
Technical DataMaterials
Sizes25 mm to 120 mm (1.00" to 4.75")FacesCB, SSC, TC
Pressure711 mm  (28") Hg Vacuum to 31 bar g(450 psig).17 bar g (250 psig) inboard differentialElastomersFKM, EPDM, FEPM, ChemLast™
Temperature-55° C to 300° C (-67˚ F to 570˚ F)Metals1.4401 (316SS)
Speed25 m/s (5000 fpm)
Springs2.4819 (Alloy C-276)
​ Fits ISO-3069, ASME B73.1, B73.2
​​​​ ​
Sealed pressure capabilities are dependent on the fluid sealed, temperature, speed and face combination. Consult Chesterton Mechanical Seal Engineering to confirm suitability for your application and to receive a product recommendation.



Installation Instructions: S10 S20 (English) Instructions: S10 S20 (English)pdf
Catalog: Mechanical Seals (English) Mechanical Seals (English)pdf
Technical Material Reference (English) Material Reference (English)pdf
Product Datasheet: S20 High Performance Cassette Double Seal (English) Datasheet: S20 High Performance Cassette Double Seal (English)pdf
Environmental Control Plans Pocket and Reference Guide (English) Control Plans Pocket and Reference Guide (English)pdf