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All Seals Incorporated
The Sealing Specialists
404 West Rowland Avenue
Santa Ana, California 92707
Phone: (714) 556-4931
Fax: (714) 557-3257

SEALS › Mechanical Seals

Mechanical Face Seals

Mechanical Face Seals are specifically engineered for rotating applications in extremely arduous environments where they withstand severe wear and prevent ingress of harsh and abrasive external media.

There are two different types of Mechanical Face Seals:

  • Type DO is the most common form that uses an O-Ring as a secondary sealing element
  • Type DF has an elastomer with a diamond-shaped cross section as a secondary sealing element instead of the O-Ring

Both types consist of two identical metal seal rings mounted in two separate housings face-to-face on a lapped seal face. The metal rings are centered within their housings by an elastomer element. One half of the Mechanical Face Seal remains static in the housing, while the other half rotates with its counter face.

Mechanical Face Seal, Type DO

Mechanical Face Seal, Type DF

Mechanical Face Seals are predominantly used for sealing the bearings in construction machinery or production plants operating under extremely arduous conditions and subject to severe wear.

These include:

  • Tracked vehicles, such as excavators and bulldozers
  • Conveyor systems
  • Heavy trucks
  • Axles
  • Tunnel boring machines
  • Agriculture machines
  • Mining machines

Mechanical Face Seals are proven for use in gearboxes, mixers, stirrers, wind-driven power stations and other applications with similar conditions or where maintenance-free lifetime sealing is expected.

For immediate assistance - Call 800-553-5054
We can supply custom designs for mechanical seals in any material and in virtually any shape or size. Send your drawings for quote or call to discuss product or material design perimeters with our engineering department.

  • Bellows Types
  • Burgmann Seals
  • Borg Warner (BWIP)
  • Cartridge Types
  • Chesterton Products
  • Custom Designs
  • Double Seals
  • Durametallic Products
  • Flowserve Products
  • Flygt Seals
  • Gaston County Seals
  • Imported Seals


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Phone: (714) 556-4931 - Toll Free: (800) 553-5054 - Fax: (714) 557-3257

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