O-rings and Backup rings

O-rings are one of the most common sealing solutions. SKF supplies O-rings in a wide range of sizes and different materials, which make them appropriate for a wide variety of operating conditions and applications. They are easy to install and they enable a simple and cost-effective seal housing design.

Designation

The designations of SKF O-rings in both metric and inch sizes contain their dimensions in metric units. The designations of SKF back-up rings in metric sizes contain their dimensions in metric units, whereas those in inch sizes contain their dash-number. The size lists for both are provided in inch and metric sizes. If applicable the unique dash-numbers for O-ring sizes in accordance with standards AS586:2012 and ISO 3601:2012 are also listed here.

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Materials

The O-rings listed in this section are made of nitrile rubber (NBR) with 70 shA hardness as standard. This is the most common O-ring material and hardness used in hydraulic cylinder applications. On request, SKF can supply alternative hardnesses such as 80 shA or 90 shA. However, SKF generally recommends choosing O-rings with 70 shA and combining them with one or two back-up rings. At operating temperatures above 100 °C (210 °F), fluorocarbon rubber (FKM) or hydrogenated nitrile rubber (HNBR) can be an appropriate materials, depending on the fluid.

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Standards and sizes

The O-rings listed in this section are made of nitrile rubber (NBR) with 70 shA hardness as standard. This is the most common O-ring material and hardness used in hydraulic cylinder applications. On request, SKF can supply alternative hardnesses such as 80 shA or 90 shA. However, SKF generally recommends choosing O-rings with 70 shA and combining them with one or two back-up rings. At operating temperatures above 100 °C (210 °F), fluorocarbon rubber (FKM) or hydrogenated nitrile rubber (HNBR) can be an appropriate materials, depending on the fluid.

Housing dimension & Dimension

O-rings for static (non-moving) sealing can be used in a wide variety of applications and arrangements. The most common arrangement in hydraulic cylinder applications is static radial sealing between coaxial cylindrical parts. The O-ring is installed in a housing that is machined either as an outside groove or an inside groove in one of the two cylindrical parts. The housing dimensions for static radial sealing O-rings are listed in the size lists.

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