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John Crane Type 37FS Split Mechanical Seals
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John Crane Type 37FS Split Mechanical Seals


The Type 37FS from John Crane is an innovative split mechanical seal designed to simplify maintenance on large, difficult-to-seal rotating equipment. Its flexible compression ring accommodates shaft deflection and vibration, while the wide sealing ring provides reliable sealing even on worn shafts.

With its outside-mounted modular design, the 37FS seal enables quick installation and maintenance. No equipment modifications are needed. These robust seals are ideal for mixers, agitators, pumps, and other heavy-duty applications across demanding industries like mining, wastewater treatment, food processing, and power generation.


  • Flexible compression ring handles shaft motion.
  • No clogging - compression ring replaces springs.
  • Slotted gland plates fit various equipment.
  • Seals worn, pitted shafts without leaks.
  • Self-aligning rotating parts.
  • Easy installation and maintenance.
  • Fits vertical and horizontal orientations.
  • Available in a broad range of sizes.


  • Mixers and agitators
  • Slurry pumps
  • Process pumps
  • Pulpers and digesters
  • Clarifiers and thickeners
  • Vacuum Filters
  • Screening Equipment
  • Centrifuges


  • Temperatures to 180°F (82°C).
  • Pressures to 80 psig (5.5 barg).
  • Speeds to 1800 rpm.
  • Shaft sizes from 1.375 to 10.187 inches.


Crane Engineering recommends John Crane seals for many sealing applications throughout your facility. We've seen them be put to the test in harsh environments and difficult to seal applications, and succed. Their lines of single cartridge seals offer fast and easy installation for maintenance teams with little time for seal maintenance.


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