Elastomer Bellows Seal Style Type C

John Crane Type 21 Replacement Seal

General Purpose, Rotating Single Spring Cartridge Seal

The Flexaseal Type C, an unbalanced general purpose seal, is an industry standard across many OEM equipment throughout the world. It serves well in a broad range of applications and provides a cost-effective sealing option.

The static seal between the elastomer bellows and the shaft coupled with the free movement of the bellows prevents sliding action and shaft damage from fretting.

  • Automatic compensation for normal shaft run-out and axial movements
  • Unbalanced design
  • Non-clogging single-spring
  • Bi-directional rotation
  • Can be applied with nearly any type of mating ring
  • Equivalent* to John Crane Type 21/521, Pac-seal Type 21/31, US Seal Type C

* Flexaseal Engineered Seals and Systems, LLC supplies replacement seals to fit a wide range of OEM equipment. Any use of other manufacturer names, marks, or model numbers is for reference only.

Elastomer Bellows Seal Style Type C

Flexaseal Type C

Features

Technical Features

  • Unbalanced
  • Non-clogging single spring
  • Bi-directional
  • Elastomer bellows

Specifications

Materials of Construction

Rotary Faces: Carbon Graphite, Silicon Carbide, Tungsten Carbide
Stationary Seats: Ceramic, Silicon Carbide, Tungsten Carbide, Stainless Steel
Bellows: Buna, Viton, EPDM, Aflas, Neoprene
Metal Parts: 304 SS standard or 316 SS option available

Operating Parameters

Dimensions: 0.375” – 3.000”
Max Pressure: 150 PSI / 10 BAR
Max Temperature: 160°C / 320°F
Velocity: 13 M/S – 2600 FPM

John Crane Type 21 Replacement Chart

Downloads

For more information on the FAS Type C

Quote Request

Depending on your specific needs and application, Flexaseal can help you identify the ideal products. Contact us to tell us about your needs and request a quote.