O Rings

An O-Ring is a circular elastomer with a disc shaped cross section, measured by measuring the inside diameter of the O-Ring and cross-sectional thickness. O-Rings, offered by us, are designed to be put inside a groove and then compressed during assembly by two or more parts, creating a seal. Our O-Rings can be used for static and dynamic applications. We specially provide moulded O-Rings in standard or non-standard inside diameters, cross sectional thickness and shore hardness. We can also manufacture O-Rings in other materials such as: polyurethane and PTFE. We also offer machining specifications of cross-sectional thicknesses for different O-Rings.

Note : Please consult fluid compatibility guide table link on our Charts and Calculators Menu.

Available In Elastomers Such As :

• Silicone Rubber : (Abbreviations used- MVQ, FMQ, PMQ)
  It can withstand extreme temperatures i.e. from -60^oC to 200^oC and above, with PMQ down to -90^oC. Silicon O-Rings usually have a shore hardness of 60.
• Ethylene Propylene Rubber : (Abbreviation used- EPDM)
  It is water resistant rubber and is capable of withstanding high temperatures (up to 180^oC in steam for peroxide cures). EPDM rubber is also ideal material for brake fluid. It usually comes in a shore hardness of 70.
  Note : We also supply backup rings for O-Rings and Quad rings.
• Nitrile : (Abbreviation-NBR)
  At temperatures up to 100^oC, or with special compounding up to 120^oC, nitrile rubber provides an economic material having a high resistance to aliphatic hydrocarbon oils and fuels. Nitrile O-Rings are available in 70, 80 and 90 shore hardness.
• Viton® : 9Abbreviation-FKM)
  This is a family of rubbers designed for very high temperature operation. They can operate continuously somewhat in excess of 200^oC depending on the grade, and intermittently to temperatures as high as 300^oC. They have outstanding resistance to chemical attack by oxidation, by acids and fuels. They have good oil resistance. Viton O-Rings usually have a shore hardness of 80.

Cross Sectional Sizes Available :
O-Rings are usually supplied in the following Metric and Imperial cross sections :

• Metric : 1mm, 1.25mm, 1.3mm, 1.5mm, 1.6mm, 2mm, 2.4mm, 2.5mm, 3mm, 4mm, 5mm, 5.7mm, 6mm ,8 and 8.4mm.
• Imperial : 1.78mm, 2.62mm, 3.53mm, 5.33mm and 7mm. O-rings are available in various elastomers.