138 pcs Stainless Steel EPDM Bonded Sealing Neoprene Rubber Washers for #4/ #5/ #6 Screws

Description

Product Overview

The 138‑piece set of stainless steel EPDM bonded sealing washers is engineered for demanding applications where a reliable, leak‑free connection is essential. Each washer features a 304 stainless steel core that resists rust, oxidation, and harsh chemicals, while the opposite side is coated with high‑quality EPDM neoprene that offers excellent aging resistance, flexibility, and temperature tolerance. The washers are sized to match #4, #5, and #6 screw threads, providing a snug fit that eliminates gaps and prevents moisture intrusion.

Dimensions are carefully controlled at 7.48 × 3.15 × 0.71 inches, and each washer weighs approximately 5.64 oz, making them easy to handle in bulk without sacrificing durability. The EPDM layer is bonded directly to the stainless steel, creating a single, unified component that does not shift or delaminate under vibration or thermal cycling. This construction ensures a consistent seal over the life of the product, reducing maintenance costs and downtime.

Manufactured by HJYZY, a reputable supplier known for precision fasteners, the washers meet industry standards for sealing performance. They have earned a solid customer rating of 4.6 out of 5 stars from 68 verified reviews, reflecting high satisfaction with fit, material quality, and overall value. The product is listed under the Industrial & Scientific category, specifically within Fasteners → Washers → Sealing Washers, and holds a competitive Best Sellers Rank of #61 in its sub‑category.

Usage

These washers excel in environments where moisture, dust, or chemicals pose a risk to equipment integrity. Typical applications include securing electrical panels, motor housings, and control cabinets where a tight, waterproof seal is required. The EPDM surface cushions the screw head, reducing stress concentrations and extending the life of both the fastener and the substrate.

In industrial machinery, the washers are used to seal hydraulic and pneumatic connections, preventing leaks that could lead to safety hazards or efficiency losses. Their corrosion‑resistant stainless steel core makes them suitable for outdoor installations, marine equipment, and chemical processing plants where exposure to saltwater or aggressive solvents is common.

For residential construction, the washers provide a dependable seal for lighting fixtures, HVAC units, and plumbing connections. Homeowners and contractors appreciate the ease of installation—simply place the washer between the screw head and the mounting surface, tighten to the recommended torque, and the seal is formed instantly without the need for additional sealants.

Because the washers are pre‑bonded, they eliminate the guesswork associated with selecting separate metal and rubber components. This reduces inventory complexity and speeds up assembly lines, making them a cost‑effective choice for manufacturers seeking to streamline production while maintaining high quality standards.

Why Choose Us

Choosing HJYZY means selecting a partner committed to material excellence and rigorous quality control. Each batch of washers undergoes ultrasonic testing to verify bond integrity, and dimensional inspections ensure every washer meets the specified tolerances. Our manufacturing process adheres to ISO‑9001 standards, guaranteeing consistency across the entire 138‑piece lot.

We stand behind our product with responsive customer support. If any issue arises—whether it concerns fit, material performance, or shipping—our dedicated service team is ready to assist via the “SELLER CONTACT” channel on Amazon. This after‑sales commitment reflects our confidence in the durability and reliability of the washers.

Environmental responsibility is also a priority. The stainless steel used is recyclable, and the EPDM neoprene is free from hazardous additives, aligning with industry sustainability goals. By selecting these washers, you not only protect your equipment but also contribute to greener manufacturing practices.

Our competitive pricing of $8.29 per pack provides exceptional value compared to comparable premium‑brand alternatives, delivering high‑grade performance without inflating project budgets.

Key Features

• Premium 304 stainless steel core resists rust, corrosion, and extreme temperatures for long‑term durability.
• EPDM neoprene side offers superior aging resistance, flexibility, and a reliable airtight seal.
• Pre‑bonded design eliminates the need for separate sealants, simplifying installation and reducing assembly time.
• Fits #4, #5, and #6 screw sizes, providing a versatile solution for a wide range of fastener applications.
• Responsive after‑sales support ensures quick resolution of any product concerns or questions.

FAQ

What size washers are included in the pack?

The pack contains 138 washers sized to match #4, #5, and #6 screw threads. Each washer is designed to sit flush against the screw head and the mating surface, creating a consistent seal across all three sizes.

Can these washers be used in outdoor or marine environments?

Yes. The 304 stainless steel core provides excellent resistance to saltwater corrosion, while the EPDM coating maintains its sealing properties even after prolonged exposure to UV radiation and moisture.

Are the washers compatible with self‑drilling screws?

Absolutely. The slick, hard surface of the stainless steel side works well with self‑drilling screws, allowing the screw to cut its own pilot hole while the EPDM side cushions the head, preventing damage to the underlying material.

Do the washers require any additional sealant?

No additional sealant is needed. The EPDM layer is bonded directly to the stainless steel, forming a permanent, leak‑proof barrier as soon as the washer is tightened to the proper torque.

What is the recommended torque for installing these washers?

We recommend tightening the screw to the torque specifications provided by the equipment manufacturer, typically between 5 Nm and 10 Nm for #4‑#6 screws. This ensures optimal compression of the EPDM layer without over‑compressing the stainless steel core.