S-90131A631 0.344" ID x 0.875" OD Abrasion-Resistant Cushioning Washers

Key Features & Benefits at a Glance

• Superior vibration dampening and sealing with SBR rubber construction, reducing equipment wear and noise in demanding applications
• Enhanced structural integrity and tear resistance due to the embedded polyester fiber filler, extending service life under load
• Reliable performance in high-temperature environments, with a maximum operating temperature of 170°F (approx. 77°C)
• Consistent, predictable compression with a Durometer 70A hardness, providing an optimal balance of flexibility and load distribution
• Precise fit for 5/16" fasteners with a 0.344" ID and 0.875" OD, ensuring easy installation and effective load spreading
• Guaranteed environmental and safety compliance, meeting RoHS 3 and REACH standards for use in regulated industries
• Durable, all-weather black compound offering good resistance to aging and environmental factors

Professional Applications & Engineering Value

This SBR rubber flat washer is engineered to solve critical challenges in industrial assembly and maintenance. The SBR (Styrene Butadiene Rubber) material, reinforced with a polyester fiber filler, provides exceptional resilience and resistance to compression set, making it ideal for applications involving constant vibration, such as in machinery, automotive components, and electrical enclosures. Its Durometer 70A hardness offers the perfect compromise between a soft seal and firm support, preventing loosening of 5/16" screws while protecting surfaces from damage. The 0.344" ID and 0.875" OD ensure a snug fit and a wide bearing surface, effectively distributing clamp load and sealing out moisture, dust, and other contaminants in demanding environments up to 170°F.

Specification Summary & Compliance

This flat washer conforms to inch system dimensions with an Inside Diameter (ID) of 0.344", Outside Diameter (OD) of 0.875", and a Thickness range of 0.047-0.077". It is manufactured from SBR Rubber with a Durometer 70A hardness and includes a polyester fiber filler for added strength. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and safe for industrial use.