Bonded Sealing Washers
Belphi Bonded Sealing Washers combine a rigid metal washer with a bonded elastomer seal to stop leaks around fasteners. When tightened, the rubber compresses to create a reliable seal while the metal ring controls compression and distributes load—ideal for sheet metal, panels, enclosures, roofing, HVAC, and industrial assemblies.
Applications
Electrical enclosures & outdoor junction boxes
HVAC panels, ducts, rooftop units
Sheet metal fabrication & OEM assemblies
Roofing fasteners & exterior hardware
Industrial equipment covers, guards, and access panels
Pumps, tanks, and general maintenance (MRO)
Belphi washers are typically specified by the fastener size they seal:
#10
#12
#12 / #14 (combo fit)
#14
1/4" (1/4-20)
5/16"
3/8"
Metric sizes available: M6 / M8 / M10
Material Options
Rubber (Elastomer)
EPDM – best for outdoor use, UV, water, weather exposure
NBR (Buna-N) – best for oil, fuel, lubricants, hydraulic environments
(Other materials available upon request.)
Metal Washer
Zinc-plated steel (common)
Stainless steel options available upon request
How to Specify
When ordering, provide:
Fastener size (example: #12 / #14 or 1/4")
Rubber material (EPDM or NBR)
Metal type (zinc-plated steel or stainless)
Quantity / packaging preference