18-8 Stainless Steel Neoprene EPDM Sealing Washers

18-8 Stainless Steel

Size:

Why use 18-8 stainless for sealing washers?

18-8 is the standard stainless for bonded sealing washers because it resists corrosion in outdoor and wet exposure while providing the structural backing the rubber needs to seal. As the screw is driven, the EPDM ring compresses around the hole and shank to keep moisture out, and the stainless washer spreads clamping load and will not rust-streak the roof or panel. This suits metal roofing, cladding, and general exterior fastening under self-drilling and self-tapping screws. For coastal or saltwater exposure where 18-8 could eventually pit, step up to 316 stainless. Do not overdrive the screw, which can distort the seal.

Why choose 18-8 stainless neoprene EPDM sealing washers

Watertight seal: bonded EPDM seals the hole against moisture.
Corrosion resistant: 18-8 stainless resists rust outdoors.
Non-staining: will not rust-streak the roof or panel.
Weather resistant: EPDM resists UV, ozone, and temperature swings.

Common applications for 18-8 sealing washers

Metal roofing and cladding
Exterior wall panels and trim
Self-drilling and self-tapping screw seals
General weatherproof outdoor fastening

For coastal and marine use, see 316 stainless neoprene EPDM sealing washers, and browse every option on the main sealing and cushioning washers category.

18-8 Stainless Neoprene EPDM Sealing Washers FAQ

Is 18-8 good for coastal use?

18-8 handles most outdoor exposure but can pit in salt. For coastal or saltwater roofing, choose 316 stainless.

Which way does the rubber face?

The rubber faces down, toward the mating surface, so it compresses against the material and around the screw to seal out moisture.

Can I overdrive the screw?

Avoid overdriving, which distorts the rubber and can break the seal. Drive until the EPDM compresses evenly around the hole.