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A Double Seal EPDM Bowl Washer, widely recognized in the industry as an umbrella washer or BAZ washer, serves as a critical sealing component for demanding fastening applications. The design features a rigid metal backing—typically stainless steel with a smooth metallic finish—permanently bonded to a pliable, dome-shaped EPDM rubber layer. When compressed, the rubber provides distinct tactile resistance, conforming precisely to the substrate. This mechanism creates an impenetrable waterproof barrier, shielding fasteners from moisture intrusion, atmospheric corrosion, and structural stress. These washers are indispensable for roofing and facade installations, effectively securing metal sheets, insulation panels, and fiber cement boards onto wooden or metallic substructures without compromising the building's envelope.
Utilizing advanced vulcanization bonding technology, the EPDM rubber is permanently fused to the metal washer. This ensures the rubber layer will not detach or shift even under extreme compression. The watertight seal relies on a unique conical profile and micro-concave ring design. As the fastener is driven, the elastic gasket conforms exactly to the surface contours, effectively blocking water, dust, and air ingress. This leak prevention mechanism is essential for maintaining dry interiors in commercial roofing and metal panel systems.
The EPDM material utilized is entirely sulfur-free, non-toxic, and environmentally safe, ensuring it will not contaminate roof rainwater runoff—aligning perfectly with modern green building standards. Molecularly stable, the rubber resists prolonged exposure to UV rays, ozone, and severe weather conditions. Furthermore, it delivers exceptional extreme temperature performance, maintaining its initial elasticity and perfect sealing capabilities in environments fluctuating from -40°C to +90°C. Combined with a corrosion-resistant metal backing, the assembly provides long-term reliability for exposed outdoor installations.
The specialized bowl shape spreads clamping pressure evenly across the fastening point. This prevents localized stress concentrations, avoiding deformation, dimpling, or cracking of sensitive building materials. Additionally, the thick rubber layer acts as a buffer, effectively dampening environmental and mechanical vibrations, which ultimately extends the lifespan of the fastened equipment and the overall structural framework.
To accommodate diverse engineering requirements, we provide comprehensive customization capabilities for our umbrella washers. Buyers can specify exact thicknesses, outer diameters, and specific metal alloys to precisely match their unique fastening systems. The technical specifications below outline the standard configurations available for immediate procurement.
| Description | Bowl EPDM washer black bonded epdm washer |
| Diameter | 4.2-6.3 |
| OD size | 14/16/19/25 |
| Standard | according customer's requirments |
| Material | Carbon steel/Stainless steel/aluminum alloy |
| Surface | Zinc plated, Hot dip galvanizing, Dacromet, mechanical galvanizing, ruspert/etc. |
| Trademark | Donghuang |
Package | Normal small boxes /colour small boxes /bulk packing /pallets |
BAZ washers are essential for installing corrugated metal sheets, roofing tiles, and fiber cement panels on wooden and metal substructures. They ensure a secure, waterproof connection that protects the building envelope from moisture damage.
These components are frequently utilized to attach insulation boards to external walls and secure insulation materials across roofs and floors, directly contributing to the overall energy efficiency of the facility.
Contractors rely on umbrella washers to create durable, long-lasting waterproof seals around window frames and door installations, preventing drafts and water seepage.
They provide reliable fastening for components within external thermal insulation composite systems (ETICS), accommodating thermal expansion while maintaining a tight seal.
Beyond traditional construction, these specialized washers are widely adopted in automotive manufacturing, pipeline sealing networks, heavy industrial machinery, and commercial furniture assembly, delivering dependable moisture and vibration protection in high-demand scenarios.
Select a BAZ washer featuring a metal backing and an EPDM rubber gasket that precisely matches the profile of your roofing or cladding material. Ensuring the correct outer diameter is vital for optimal load distribution.
Insert the appropriate screw through the center of the bowl washer. Position the assembly so that the pliable rubber gasket rests directly against the surface of the roofing sheet or substrate.
Drive the screw to the required depth using controlled torque. It is critical not to overtighten; you should feel firm tactile resistance as the rubber compresses. Excessive force can crush the gasket, causing it to lose flexibility and potentially gouge the metal sheet. The objective is for the EPDM layer to conform smoothly to the sheet's shape, providing a flexible, watertight seal.
After securing the fastener, snap a shallow protective cap over the top of the fixing head. This additional layer shields the screw and the washer assembly from direct elemental exposure, prolonging the lifespan of the watertight seal.
We operate as a primary manufacturer with a dedicated international sales department. We handle the entire production cycle and direct distribution of our sealing components, ensuring streamlined communication and competitive procurement conditions.
Our core manufacturing range encompasses expansion screws, industrial fasteners, architectural hardware, specialized plastic parts, precision stamping parts, zinc die castings, and custom non-standard engineered components.
Our fastening solutions support virtually the entire construction sector and mechanical equipment installation fields. Key applications include securing large-scale outdoor machinery, commercial facility outfitting, and heavy-duty cargo installations.
Yes. We provide extensive flexible customization capabilities, allowing buyers to specify exact washer thicknesses, outer dimensions, and specific metal materials to precisely match diverse industry requirements and engineering specifications.
Quality assurance is embedded in our workflow. We conduct rigorous inspections after every manufacturing process. Finished batches undergo comprehensive testing aligned with strict international standards, including prolonged UV exposure, ozone resistance, and high-pressure sealing evaluations, guaranteeing absolute consistency for large-scale procurement.
During the quotation phase, we confirm the preferred transaction terms (FOB, CIF, CNF, etc.). For mass production orders, standard terms require a 30% deposit prior to manufacturing, with the remaining 70% balance settled against the copy of shipping documents. T/T is our most common method, though L/C is also fully acceptable.
