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O-Rings, Kits & Bonded Seals

O-rings in NBR, Viton, silicone, EPDM, neoprene and PU, boxed O-ring kits, and bonded (Dowty) seals for hydraulic fittings.

Showing 1–10 of 10 products

  • NBR O-Rings — NBRO-Rings, Kits & Bonded Seals

    NBR O-Rings

    An O-ring is the simplest seal: a ring of rubber squeezed in a groove, for static joints and slow-moving parts. Made in nitrile (NBR), which handles mineral oils, greases and water well.

    MaterialNBR

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  • Silicone O-Rings — SiliconeO-Rings, Kits & Bonded Seals

    Silicone O-Rings

    An O-ring is the simplest seal: a ring of rubber squeezed in a groove, for static joints and slow-moving parts. Made in silicone, which stays flexible from very low to high temperatures.

    MaterialSilicone

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  • Viton O-Rings — VitonO-Rings, Kits & Bonded Seals

    Viton O-Rings

    An O-ring is the simplest seal: a ring of rubber squeezed in a groove, for static joints and slow-moving parts. Made in Viton (FKM), for high temperatures, fuels and many chemicals.

    MaterialViton

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  • Neoprene O-Rings — NeopreneO-Rings, Kits & Bonded Seals

    Neoprene O-Rings

    An O-ring is the simplest seal: a ring of rubber squeezed in a groove, for static joints and slow-moving parts. Made in neoprene, with good resistance to weather, ozone and moderate oils.

    MaterialNeoprene

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  • EPDM O-Rings — EPDMO-Rings, Kits & Bonded Seals

    EPDM O-Rings

    An O-ring is the simplest seal: a ring of rubber squeezed in a groove, for static joints and slow-moving parts. Made in EPDM, which suits water, steam, weather and ozone but not mineral oil.

    MaterialEPDM

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  • PU O-Rings — PUO-Rings, Kits & Bonded Seals

    PU O-Rings

    An O-ring is the simplest seal: a ring of rubber squeezed in a groove, for static joints and slow-moving parts. Made in polyurethane (PU), which resists wear and extrusion far better than rubber.

    MaterialPU

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  • NBR O-Ring Kit — NBRO-Rings, Kits & Bonded Seals

    NBR O-Ring Kit

    An O-ring kit is a box of assorted sizes, so maintenance teams can replace a ring on the spot instead of waiting for one size. Made in nitrile (NBR), which handles mineral oils, greases and water well.

    MaterialNBR

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  • Viton O-Ring Kit — VitonO-Rings, Kits & Bonded Seals

    Viton O-Ring Kit

    An O-ring kit is a box of assorted sizes, so maintenance teams can replace a ring on the spot instead of waiting for one size. Made in Viton (FKM), for high temperatures, fuels and many chemicals.

    MaterialViton

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  • Silicone O-Ring Kit — SiliconeO-Rings, Kits & Bonded Seals

    Silicone O-Ring Kit

    An O-ring kit is a box of assorted sizes, so maintenance teams can replace a ring on the spot instead of waiting for one size. Made in silicone, which stays flexible from very low to high temperatures.

    MaterialSilicone

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  • Dowty Seals (Bonded Seals) — Steel with NBRO-Rings, Kits & Bonded Seals

    Dowty Seals (Bonded Seals)

    A Dowty seal (bonded seal) is a metal washer with a rubber sealing ring bonded inside it. Material: Steel with NBR.

    MaterialSteel with NBR

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About o-rings, kits & bonded seals

O-rings are the most common seal of all: a rubber ring squeezed in a groove to seal static joints and slow-moving parts. We stock O-rings in nitrile (NBR), Viton (FKM), silicone, EPDM, neoprene and PU, boxed O-ring kits for maintenance stores, and Dowty (bonded) seals for hydraulic fittings.

O-rings are sized by inside diameter × cross-section, for example 20 × 2.5 mm. Tell us the size, the fluid and the temperature, and we'll suggest the right material.

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Common questions

How is an O-ring measured?

By its inside diameter (ID) and its cross-section (thickness), both in millimetres. Measure the ring unstretched, or measure the groove it fits in.

Which O-ring material should I use?

Nitrile for oils, greases and water; Viton for high temperatures, fuels and many chemicals; EPDM for water and steam but not oil; silicone for food use and very high or low temperatures.

What is a Dowty seal?

A Dowty seal, or bonded seal, is a steel washer with a rubber ring bonded inside it. It seals threaded hydraulic ports, banjo bolts and drain plugs, and is chosen by thread size.

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