Dowty seals
A Dowty Seal (commonly known as a bonded seal or bonded washer) is a high-pressure, static gasket used to create a leak-proof fluid barrier around screw threads, bolts, and pipe connections. Invented in the 1940s by the Dowty Group, it features a dual-material design consisting of a rigid metal outer ring and a trapezoidal elastomeric inner lip vulcanized together under immense heat and pressure. When compressed under joint torque, the elastomeric ring deflects to fill micro-imperfections on the metal surface, while the metal ring serves as a permanent compression limiter to prevent over-tightening or blowout.
- Operating Pressure : High Performance Range
- Application : Industrial & Mobile Systems
About this item
Dowty seals, widely known as bonded seals or bonded washers, are high-pressure sealing components consisting of a metal outer ring and an elastomeric rubber inner ring vulcanised together. They are engineered to prevent fluid or gas leaks in high-vibration and high-pressure hydraulic fittings, valves, pipe joints, and thread connections where standard washers or O-rings fail. When a bolt or fitting is tightened, the rubber element compresses to create an airtight, zero-leak seal, while the robust metal ring serves as a compression limiter to prevent structural damage or blowout under pressure
| BSP Thread Size | Standard Size Ref | Inner Diameter (ID) ±0.1mm | Outer Diameter (OD) ±0.1mm | Metal Washer Thickness |
|---|---|---|---|---|
| 1/8″ | 820 | 10.37 mm | 15.88 mm | 2.00 mm |
| 1/4″ | 821 | 13.74 mm | 20.57 mm | 2.00 mm |
| 3/8″ | 823 | 17.28 mm | 23.80 mm | 2.00 mm |
| 1/2″ | 825 | 21.54 mm | 28.58 mm | 2.50 mm |
| 3/4″ | 827 | 27.05 mm | 34.93 mm | 2.50 mm |
| 1″ | 830 | 33.89 mm | 42.80 mm | 3.20 mm |
| 1 1/4″ | 832 | 42.93 mm | 52.38 mm | 3.20 mm |
| 1 1/2″ | 833 | 48.44 mm | 58.60 mm | 3.20 mm |
| 2″ | 836 | 60.58 mm | 73.03 mm | 3.20 mm |
| 2 1/2″ | 839 | 76.08 mm | 90.17 mm | 3.20 mm |
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