Chesterton S20 High Performance Cassette Tandem Double Mechanical Seal

1 to 4.75in / 25 to 120mm shaft sizes, tandem seal configuration, high flow internal pumping ring, monolithic face design, oversized seal chamber option available.

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Product Manual
Product Specs

Effective April 15th, 2025 Chesterton has added a 3% surcharge for all of their products. The surcharge will appear as a separate line item on the order.

Highlights...

Features

  • Standard and oversized seal chamber models available
  • Shaft sizes:
    • 1in to 4.75in (Standard Model), 1.125in to 2.625in (OS Chamber Model)
    • 25mm to 120mm (Standard Model Only)
  • -67 to 570°F (-55 to 300°C) operating temperature
  • Pressure ratings:
    • 711mm (28in) Hg Vacuum to 30barg (450psig)
    • 250psig (17barg) inboard differential pressure
  • Face Materials:
    • Carbon Graphite, Resin Impregnated
    • Silicon Carbide, Sintered Pressureless
    • Tungsten Carbide, Ni-Binder
  • Elastomers:
    • Fluorocarbon (FKM)
    • Tetrafluoroethylene-Propylene (FEPM)
    • ChemLast 550 (FFKM)
    • Ethylene Propylene (EP)
  • Up to 5000 FPM operating speed
  • 316 Stainless Steel / EN 1.4401 metal parts
  • Alloy C-276/EN 2.4819 springs
  • Micro-polished o-ring surfaces
  • ISO-3069C, ASME 873.1, B73.2

The Chesterton S20 High Performance Cassette Tandem Double Mechanical Seal features a self centering lock ring and self releasing setting clips, enabling quick, easy, and accurate installation. Sealing security is ensured by the tandem configuration allowing operation with elevated barrier system pressures and preventing process leakage to the atmosphere.

Part Number Price Available
190768
Show Configuration
$3,023.00 14 in stock
190762
Show Configuration
$3,023.00 4 in stock
179762
Show Configuration
$3,041.00 2 in stock
190774
Show Configuration
$3,023.00 2 in stock

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Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 2 to 3 weeks". Click here to select options