Our washers consist of EPDM rubber that is permanently bonded onto a thin stainless steel washer. The inside rubber surrounds the threads of the screw to keep moisture out when installed.
Our EPDM bonded sealing washers are installed under the heads of self drilling, self-tapping, and self piercing screws. The rubber faces down and makes contact with the mating metal. EPDM is bonded to 304 (18-8) stainless steel for superior corrosion resistance. We stock large diameter washers up to 1 1/8″ OD”.
The Key Points of EPDM Bonded Sealing Washers
- Moisture protection
- Cushioning washers
- Acoustical control
- Vibration control
- They protect the scratching between the bottom of the screw and the base metal
As the screw is being driven in, the rubber in the underside of the screw makes contact with the metal. The rubber washer faces the bottom and eliminates metal to metal contact.
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Plain screws when drilled without rubber washers underneath creates metal to metal contact when they bottom out and stop. This causes scratching on the base metal. These scratches on the metal cause corrosion and rusting to start. The metal-to-metal scratching exposes the base metal which accelerates this corrosion and rusting process.
Our EPDM washers have a base of 304 (18-8) stainless steel. This is the most commonly used grade of stainless steel for these washers. 18% chromium and 8% nickel are added to mostly iron to create stainless steel.
Our stainless steel EPDM washers provide superior corrosion and rust resistance. We choose this high strength steel because of their exceptional qualities.
Ford Fasteners uses 304 stainless washers on our 410 stainless self drilling, self-tapping and self piercing screws for superior strength and corrosion resistance. We offer in house assembly with our high-speed machines.