S-90131A634 0.406" ID x 1.25" OD Abrasion-Resistant Cushioning Washers

Key Features & Benefits at a Glance

• Superior Sealing Performance: SBR rubber construction with polyester fiber filler creates an effective barrier against moisture, dust, and contaminants in industrial environments.
• Excellent Vibration Damping: Durometer 70A hardness provides optimal flexibility to absorb shock and reduce noise in machinery and equipment assemblies.
• Chemical and Temperature Resistance: Withstands temperatures up to 170°F and offers good resistance to various industrial chemicals, extending service life.
• Precise Fit for 5/16" Fasteners: 0.406" ID ensures secure seating on 5/16" screws, preventing misalignment and improving assembly efficiency.
• Enhanced Durability: Black SBR rubber material with fiber reinforcement maintains structural integrity under compression and repeated use.
• Regulatory Compliance: Meets RoHS 3 and REACH environmental standards, ensuring safe use in regulated industries and global markets.
• Versatile Industrial Application: Suitable for various sealing, gasketing, and isolation needs across multiple sectors including manufacturing and equipment assembly.

Professional Applications & Engineering Value

This SBR rubber flat washer delivers critical engineering solutions for industrial applications where vibration damping and fluid sealing are paramount. The combination of SBR rubber material with polyester fiber filler creates a robust sealing element that maintains compression set resistance while providing excellent recovery properties. Engineered for 5/16" screw size applications, these black rubber washers prevent loosening caused by machine vibrations and thermal cycling, significantly reducing maintenance frequency in heavy-duty equipment. The 0.406" ID x 1.25" OD dimensions ensure proper surface coverage for effective gasketing, while the Durometer 70A hardness offers the ideal balance between flexibility and load distribution. These characteristics make them particularly valuable in automotive assemblies, industrial machinery, electrical enclosures, and plumbing systems where reliable sealing and vibration isolation are critical to operational efficiency.

Specification Summary & Compliance

This flat washer features precise dimensional specifications with 0.406" inner diameter and 1.25" outer diameter, designed specifically for 5/16" screw size applications. The thickness range of 0.047-0.077" accommodates various compression requirements while maintaining sealing effectiveness. Manufactured from SBR rubber with Durometer 70A hardness and reinforced with polyester fiber filler for enhanced durability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial use across global markets.