12149 Rhea Drive
  Plainfield, IL 60585
Phone (815) 609-4977
Fax (815) 609-5977



The correct mating ring design is vital to proper seal performance. Like the stationary face, the mating ring face must be extremely flat and smooth. It must be mounted on the shaft in a way that prevents slipping, leakage or distortion. Misalignment of the mating ring or excessive shaft runout can prevent the stationary and rotary faces from maintaining the perfect contact necessary for sealing.

The configurations shown below are typical. Exact specifications are made by AMS Seal engineering after a review of each application's operating conditions and space requirements.

Typical Configurations

Clamped Ring

For all practical purposes, this design imposes no temperature, pressure or shaft speed limitations. A shaft sleeve clamps the ring solidly to a step or bearing, providing positive drive and eliminating elastomers.
The end of the sleeve and the shaft shoulder must be square to the centerline and their surfaces finished to approximately 125 micro in. rms.
Clamped Ring with Elastomer

This type is also clamped in place, but it uses a static elastomer for positive sealing of low viscosity fluids. Temperatures are normally limited to 450?F, depending on choice of elastomer.

Note: All AMS Seal clamped rings utilize equal clamping areas on either side of the ring. This eliminates any twisting moments which tend to distort the ring.

“O” rings, when used, are located in the shaft. This prevents any chance of the clamping action distorting narrow flanges on either side of the “O” ring groove.

Shaft Shoulder

When space is limited, a suitably finished shaft shoulder or end may act as a mating ring. Such an installation is not normally recommended because of the difficulty in establishing the proper surface finish.
Balanced Ring

This ring uses hydraulic pressure to maintain its axial location. P1 can exceed P2 by 500 psi max.
“L” Shaped Ring, Packing Driven

This is a low-cost ring for low pressure applications. It is sealed to the shaft and driven by the square packing.
Solid Ring, Pin Driven

A pin provides positive drive and an “O” ring seals between the mating ring and shaft.
These rings are suitable for high reverse pressures (P2 > P1).