Type FFZT​ | O-ring Pusher Seals | John Crane Mechanical Seals

Type FFZT​

Single Cartridge O-ring Seal

Designed to Reduce Installation Time and Errors​​

The compactness of Type FFZT cartridge seals ensures they will fit all ANSI and DIN stuffing boxes and offers an ideal upgrade from packing. The Type FFZT is a robust cartridge seal used for various duties from chemicals to oil and water and many abrasive and crystallizing duties. It is ideal for top-entry mixers, where the liquid product may not provide continuous cooling and lubrication of the seal faces. Premium seal face materials ensure low heat generation and dry-running thermal stability. For top-entry agitators, a design variation is available for use in hygienic applications.

The Type FFZT is a variant of the Type FFET, using common, replaceable face inserts.​



  • California Residents: PROPOSITION 65 WARNING
  • Heavy-duty silicon carbide seal faces resist abrasion from slurries for a longer operating life
  • Common face design used for both primary and mating rings
  • Common face design used across FFZL/R and FFZT ranges
  • Non-clogging single, stationary spring is resistant to chemical attacks, permits high-speed operation to 6000 rpm and handles minor misalignment between the motor and pump shaft
  • Simple maintenance and repair
  • Use of large section heavy duty components resists damage in aggressive environments
  • Diamond face technology for industrial applications – adding John Crane Diamond® to mechanical seal faces helps overcome short seal life and equipment breakdowns caused by harsh operating conditions

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