Bonded Seals

Bonded seals are composite washers with a metal outer ring and a moulded elastomer sealing lip around the bore. Tightening a bolt or threaded fitting compresses the lip while the metal ring limits deformation, producing a compact static seal at fasteners and fluid connections.

Key facts

Family: O-Rings & Static Seals
Common types: Self-centring washer, Non-centring washer, Metric series, BSP series, Stainless steel washer
Materials: Zinc-plated steel, Stainless steel, NBR, FKM (fluoroelastomer), HNBR
Used in: Hydraulic fittings, Banjo bolts, Drain plugs, Fuel connections, Pneumatic fittings

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Types

Self-centring washer
Non-centring washer
Metric series
BSP series
Stainless steel washer

Materials

Applications

Hydraulic fittings
Banjo bolts
Drain plugs
Fuel connections
Pneumatic fittings

What to send for a quote

thread size and standard
inside and outside diameters
washer thickness
metal grade
elastomer compound

Questions about bonded seals

What should I send to identify bonded seals?

Send thread size and standard, inside and outside diameters, washer thickness, metal grade, elastomer compound. Confirm whether the inner rubber bead includes centring ribs and whether the washer seals under a bolt head or fitting shoulder. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select bonded seals?

Match the thread system, bearing face, metal corrosion resistance and elastomer to the fluid and temperature. Confirm the mating parts and operating environment before ordering, since an apparently similar size can use a different profile, material or internal arrangement.

Last updated: 2026-10-08