A metal washer bonded to an EPDM or NBR face compresses to seal against water, weather, and low-pressure fluids — roofing screws, sumps, and fluid fittings.
Conforms to

Bonded elastomer seal keeps weather and fluid out.
A cross-section of stocked configurations. Not exhaustive — diameters, lengths, grades, and finishes extend across the full range on request.
Representative specifications — not exhaustive · NXB-SEW
Match the line to the load, the environment, and the standard it answers to.
Materials
Finishes
Standards
Typical applications
Served industries
Mating parts and adjacent lines engineers reach for alongside this one.
Oversized outer diameter spans thin or slotted material.
M5–M16 · 3/16"–1/2"
Spreads clamp load and protects the bearing surface.
M3–M36 · #6–1-1/2"
Fully threaded, sharp thread for thin-gauge metal.
#4–#14 · Ø2.9–Ø6.3 mm
Forms or cuts its own mating thread in metal and plastic.
#4–#14 · Ø2.9–Ø6.3 mm
Grade, material, finish, and standard — matched to your joint and quoted from stock. Tell us the load case and we’ll confirm the line.