Bonded Seal Washers - Various Common Sizes - BSP and Metric

Simply pick from the options the size of the seal required - SOLD in Pack Size Of Five (5)

PLEASE READ THE SIZES AND MAKE SURE YOU UNDERSTAND BSP SIZES

A bonded seal is a type of washer used to provide a seal around a screw or bolt.

Originally made by "Dowty Group", they are also known as Dowty seals or Dowty washers.

These sealing washers are now widely manufactured, they are available in a range of standard sizes and materials

This listing contains widely used sizes. "BSP" & Metric

PLEASE NOTE:

1/2" BSP Thread is NOT 1/2" (12.7mm) in size - BSP Threads are different - PLEASE READ FULL LISTING - Thanks

This goes for all the BSP Threads

Metric is a lot easier - A 12mm Bonded Washer Fits On A 12mm Bolt /Stud / Fitting

Information:

A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an elastomeric material that acts as a gasket.

It is the compression of the elastomeric part between the faces of the parts on either side of the bonded seal that provides the sealing action.

The elastomeric material, typically nitrile rubber, is bonded by heat and pressure to the outer ring, which holds it in place.

This structure increases resistance to bursting, increasing the pressure rating of the seal.

Because the bonded seal itself acts to retain the gasket material, there is no need for the parts to be sealed to be shaped to retain the gasket.

This results in simplified machining and greater ease of use as compared to some other seals, such as O-rings.

These washers come with an additional flap of rubber on the internal diameter to locate the bonded seal at the centre of the hole, these are called self-centering bonded washers.

This additional flap makes installation much easier.

Typically these are used on High pressure hydraulic systems - You will find a lot of these on fittings connected to valve blocks. pumps and motors - Saying that - A very common application is on fuel taps on British Bikes. The fuel tap normally uses two of these.

Due to the way the seal works - they are suitable for low pressure application like oil drain bung /bolts

Product Descriptions:

(Sizes Quoted Are Approx) NOTE: BSP thread is different to standard imperial measurements.

IMPERIAL

KW260 Bonded Seal Washer

1/8" BSP (similar to dowty) 10 x 16.0 x 2.0mm

Approx inner diameter of this washer is 9.5mm

KW261 Bonded Seal Washer

1/4" BSP (similar to dowty) 14 x 21.0 x 2.0mm

Approx inner diameter of this washer is 13mm.

KW262 Bonded Seal Washer

3/8" BSP (similar to dowty) 17 x 24.0 x 2.5mm

Approx inner diameter of this washer is 16.5mm

KW263 Bonded Seal Washer

1/2" BSP (similar to dowty) 22 x 28.0 x 2.5mm

Approx inner diameter of this washer is 21mm.

KW265 Bonded Seal Washer

3/4" BSP (similar to dowty) 28 x 35.0 x 2.5mm

Approx inner diameter of this washer is 26.5mm.

KW266 Bonded Seal Washer

1" BSP (similar to dowty) 33 x 42.0 x 2.5mm

Approx inner diameter of this washer is 33.25mm

METRIC

KW250 Bonded Seal Washer

M10 (similar to dowty) M10 x 16.0mm x 1.5mm

KW251 Bonded Seal Washer

M12 (similar to dowty) M12 x 18.0mm x 1.5mm

KW252 Bonded Seal Washer

M14 (similar to dowty) M14 x 21.0mm x 1.5mm

KW253 Bonded Seal Washer

M16 (similar to dowty) M16 x 26.0mm x 1.5mm

KW254 Bonded Seal Washer

M18 (similar to dowty) M18 x 26.0mm x 1.5mm

KW255 Bonded Seal Washer

M20 (similar to dowty) M20 x 28.0mm x 1.5mm

KW256 Bonded Seal Washer

M22 (similar to dowty) M22 x 30.0mm x 1.5mm

KW257 Bonded Seal Washer

M24 (similar to dowty) M24 x 32.0mm x 1.5mm

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