Harkesh has been manufacturing top quality critical O-rings since 1981. Our expertly tuned techniques eliminate the appearance of any parting lines and provide a complete 'O' cross section, thus ensuring effective sealing.

We use the tear and trim moulding process for catering to the critical sealing needs of our customers and can also provide Orings with parting line at a 45ยบ angle. Currently, we possess over 2000 moulds and hold around 100,000 rings in a vast range of stock sizes and materials

Quad Rings

Quad-Rings are four-lipped seals with a specially developed sealing profile that provides twice the number of sealing surfaces as an O-ring. The four-lobed design not only provides lower fiction than an O-ring, but also resists spiral twist, due to its square cross section. Quad-Rings are available in a wide range of elastomeric materials for both standard and special applications. Quad-Rings are vulcanized as a continuous ring. Their dimensions are specified with the inside diameter "d1" and the cross-section "W." Quad-Rings are available in all standard O-Ring sizes from 1/32" to 26", as well as custom seals for unique applications.


  • There are two sealing surfaces to provide a positive seal with less friction. Due to an improved pressure profile over Quad-Ring cross-section, a high sealing effect is achieved.
  • The recessed mould parting line provides no flash or parting line on the surface of the seal and ensures "zero leakage." A lubricant reservoir formed between the sealing lips improves performance at start-up.
  • The quad cross-section resists spiral twisting and extrusion. Due to its special profile, the seal does not tend to twist in the groove during reciprocating movement.
  • Twice the sealing surface means less radial squeeze is needed to create an effective seal resulting in less friction, less wear and longer service life

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