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AST 50 cutaway



Metal components: 316 Stainless Steel standard; Hastelloy C-2761 available
Rotating seal ring: Carbon-Graphite or Silicon Carbide
Stationary seal ring: Sintered Silicon Carbide or Alumina Ceramic
Springs: Hastelloy C-276
O-rings: Fluoroelastomer, EPDM, Aflas2, or Isolast3 perfluoroelastomer


Pressure: 150 PSIG (10 bar) maximum to 28 in (710 mm) Hg vacuum,
depending on shaft size and speed.
Temperature: To 400°F (205°C), depending on O-ring elastomer limits in fluid sealed

Notes: 1Trademark of Haynes International Inc., 2Trademark of Asahi Glass Co. Ltd., 3Trademark of Trelleborg Sealing Solutions

The AST 50 seal fits all ANSI pumps and many others where a single outside mechanical seal is required because of an extremely corrosive environment or for low pressure service. It's the ideal seal for nonmetallic pumps including Fybroc and GRP. The AST 50 has no metal parts in direct contact with the pumped fluid. The multiple springs are isolated from the pumped fluid.

Because the proper spring compression is preset, the AST 50 Mechanical Seal is easy to install. Just slide the rotary unit over the shaft until it contacts the stationary face, tighten the drive ring to the shaft, and remove the retaining clips.

The AST 50 Seal is designed for use where an outside seal is required, as a low cost replacement for seals made of exotic metals, in corrosive fluids which attack inside mounted mechanical seals, and in food service where the seal must be cleaned for sanitation.

The AST 50 Seal is readily accessible, not hidden in the stuffing box.

Because the AST 50 Seal is internally balanced, no expensive sleeves or steps in the shaft or modifications to the pump are required.


AST 50 seals and matching stationary seal rings are available off-the-shelf to fit most popular nonmetallic and ANSI pumps, including Fybroc and Flowserve GRP.