RaceFlux Dowty Bonded Sealing Washer, for M12, 7/16", -4AN Threads

11 Oct.,2022


dowty bonded seal

RaceFlux's bonded sealing washers are made from zinc-plated steel with a Nitrile (NBR) rubber bonded inner seal. These sealing washers will provide a leak free seal in straight fitting applications designed for crush washers or sealing washers. May also be used in place of an O-ring in applications where the opposing sealing surface does not feature an O-ring gland or O-ring boss.

These bonded sealing washers are "self-centering", meaning that the internal diameter of the rubber seal is smaller than the screw's major thread diameter. With a tight seal around the screw, these washers center themselves while also creating a better seal.

Features and Benefits

  • Zinc-plated steel with high temp Nitrile (NBR) bonded seal
  • Self-centering
  • For straight thread fittings that rely on an O-ring, crush washer, or sealing washer
  • May be used with our straight thread AN fittings or straight thread Metric fittings


Part # Thickness (mm) Screw Size

F (mm)

I.D. (mm)

O.D. (mm)

HWA-4008 1.0 M8 6.4 8.7 13 HWA-4010 2.0mm M10, 3/8", and 1/8" BSP 8.05 10.7 16 HWA-4012 1.5 M12, 7/16", -4AN 9.73 12.7 18 HWA-4014 1.5 M14, -6AN 11.38 14.7 22 HWA-4016 1.5 M16, 3/8" BSP 13.41 16.7 24 HWA-4018 1.5 M18 14.76 18.7 26 HWA-4020 1.5 M20, 1/2" BSP, 13/16" 16.76 20.7 28 HWA-4022 2.0 M22 18.74 22.7 30 HWA-4024 2.0 M24 20.11 24.7 32