O Rings

O-rings are simple, precise and extremely useful seal designs.

They are one of the most engineered seals due to their high popularity and versatility. Without them, machine design is very difficult as they are usually one of the most important elements.

At WM Seals, we supply O-rings in various metric and inch standard sizes.

We produce elastomer O-rings in Nitrile, Viton, Silicone, HNBR. We also produce PTFE, EPDM and Polyurethane O-rings for explosive decompressions.

Contact Us Today on 01935 317 084

Box Kits

WM Seals produced customised sealing kits for many different industries. These often contain non-seal components, as well as the standard available selections.

For particular industries, such as plumbing, we offer standard O-ring selection boxes, which cover metric and imperial sizes which are commonly used.

Bonded seals can also be supplied as BSP or metric popular sizes held within a selection box.

Various other selections exist including:

  • Copper Washers

  • Circlips

  • Roll Pins

  • Cotter Pins Fibre Washers E-clips

  • O-clips

  • And Many Others


O Rings are highly useful in a number of industries which we supply to, these include:









Sizes & Designs

We supply O-rings in various metric and inch standard sizes, the sizes are specified using the inside diameter and cross section diameter (thickness) of the O-rings.

The standard sizes depend on where you’re from. For instance, in the US the most common standard inch sizes are per SAE AS568C specification (e.g AS568-214)

Whereas the UK also has standards sizes known as BSsizes, typically ranging from BS001 to BS932.

ISO 3601- 1:2008 contains the most commonly used standard sizes, both inch and metric, worldwide. However, there are also several other size specifications.

Shore hardness can be between 40IRHD to 95 IRHD and in some instances coloured rings can be manufactured. Variants on the o ring would be the square section ring and the quad or X ring.


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