S-90131A612 0.531" ID x 1.75" OD Abrasion-Resistant Cushioning Washers

Key Features & Benefits at a Glance

• Superior vibration damping with SBR rubber construction to protect equipment and reduce noise in industrial environments
• Excellent sealing performance prevents fluid and dust ingress, extending component lifespan in demanding applications
• Reinforced durability through polyester fiber filler that maintains washer integrity under compression and load
• Consistent 70A durometer hardness ensures reliable compression recovery and sealing force retention
• High-temperature resistance up to 170°F (76°C) for stable performance in heated industrial operations
• Precision inch dimensions (1.75" OD × 0.531" ID) provide perfect fit for 1/2" screw applications
• Regulatory compliance with RoHS 3 and REACH standards ensures environmental safety and global market acceptance

Professional Applications & Engineering Value

These SBR rubber flat washers deliver critical engineering solutions where vibration isolation and environmental sealing are paramount. The polyester fiber reinforcement prevents deformation under constant bolt tension, while the 70A durometer rubber maintains optimal compression for long-term sealing performance. Ideal for industrial machinery, automotive assemblies, and outdoor equipment, these black washers effectively dampen operational vibrations that can loosen fasteners and damage sensitive components. Their temperature resistance to 170°F makes them suitable for engines, pumps, and heated industrial systems where thermal stability is essential. The precise 1.75" OD and 0.531" ID dimensions ensure proper seating on 1/2" screw applications, preventing misalignment and distributing clamp load evenly across surfaces.

Specification Summary & Compliance

Manufactured to precise inch system dimensions: 1.75" outer diameter × 0.531" inner diameter with thickness tolerance of 0.078-0.108". Designed specifically for 1/2" screw size applications with consistent 70A durometer hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restriction of hazardous substances and safe industrial use. The SBR rubber material with polyester fiber filler provides reliable performance across various industrial environments while maintaining dimensional stability.