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Rotary Shaft Seals

Sealing rings for rotating shafts type A and AO

Sealing rings for rotary shafts type A and AO, commonly called simmerring, are most often made of NBR, FPM, MVQ, AEM rubber. They are used to seal shafts with circumferential speeds up to about 20 m / s depending on the material, sealing lip and environmental temperature.

simmer ring sealant


NBR nitrile rubber

It is resistant to oils (also of plant and animal origin), mineral greases, aliphatic hydrocarbons, non-flammable hydraulic fluids of HSA and HSB type. Resistant to water at temperatures up to + 100 ° C, as well as dilute solutions of acids and bases up to + 50 ° C. Working range at temperatures from -30 ° C to + 100 ° C.

Fluorocarbon rubber FPM

Wide operating range from -20 ° C to + 250 ° C. Resistant to fire-retardant hydraulic fluids such as HSC and HSD and synthetic oils. Stable in contact with mineral oils and greases, aliphatic and aromatic hydrocarbons.

MVQ silicone rubber

Temperature resistant from -50 ° C to + 200 ° C. Silicone is resistant to mineral oils and greases, diluted salt solutions as well as water up to + 100 ° C. Stable in contact with alcohols.

AEM ethylene acrylic rubber

It is resistant to engine, gear and hydraulic oils. Compatible with contact with aliphatic and aromatic hydrocarbons. Working range in temperatures from -25 ° C to 175 ° C.


Sealing rings rotating A and AO

Radial rings type A and AO are mounted on rotating or oscillating elements of devices. They are used in machines and industrial devices to keep the lubricating medium inside.

The rotary sealing ring consists of a dynamic sealing lip made of elastomer with or without a spring. The sealing lip is pressed against the shaft surface by means of a spring.

Type A simmerings are single-lip, while AO simmering is double-lip, with an additional anti-dust lip.

Learn about the advantages of using A and AO simmerings:

  • They provide very good static tightness
  • They keep the lubricant inside
  • They prevent leakage
  • They prevent the ingress of dirt (mud, sand, water) from the outside to the inside
  • They ensure long-term and failure-free operation of machines and devices
  • Compensate for thermal expansion (type AO)
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