S-5916K35 0.5" ID x 1.375" OD Chemical-Resistant Cushioning Washers

Key Features & Benefits at a Glance

• Superior Sealing Performance: The raised grid design on the Buna-N rubber surface enhances compression and creates an effective seal against moisture, dust, and contaminants, ensuring long-term protection for your assemblies.
• Excellent Vibration & Shock Absorption: With a Durometer 63A hardness, this washer provides optimal flexibility to dampen vibrations, reduce noise, and prevent loosening in dynamic or high-movement applications.
• High-Temperature & Chemical Resistance: Constructed from Buna-N rubber, it withstands temperatures up to 200°F and offers good resistance to oils, water, and many industrial fluids, extending service life in harsh environments.
• Precise Fit for 1/2" Screws: The 0.5" ID and 1.375" OD ensure a snug, secure fit on standard 1/2" fasteners, minimizing misalignment and improving load distribution across the joint.
• Enhanced Grip & Stability: The combination of raised and indented grid patterns increases surface friction, providing a non-slip interface that maintains bolt tension under stress and thermal cycling.
• Regulatory Compliance for Global Markets: Fully compliant with RoHS 3 and REACH regulations, making these washers safe for use in electronics, automotive, and other industries with strict environmental standards.
• Durable & Consistent Thickness: With a thickness range of 0.281-0.343", these washers offer reliable performance and uniform compression, ensuring repeatable results in automated or manual assembly processes.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these Buna-N rubber raised grid washers address critical challenges in machinery, automotive, and electrical enclosures where vibration resistance and environmental sealing are paramount. The raised grid pattern increases the sealing force by concentrating pressure, which effectively prevents fluid ingress and compensates for surface irregularities on flanges or panels. Made from Buna-N (Nitrile Rubber), the material maintains elasticity and sealing integrity across a wide temperature range up to 200°F, while resisting degradation from oils and chemicals. This makes them ideal for use in pump systems, engine compartments, and outdoor equipment—solving common issues like bolt loosening, corrosion, and gasket failure. Their inch system dimensions (0.5" ID, 1.375" OD) ensure compatibility with standard 1/2" screw fasteners, providing engineers with a reliable, off-the-shelf solution that enhances assembly longevity and reduces maintenance cycles.

Specification Summary & Compliance

This washer features precise dimensional tolerances with an Inside Diameter (ID) of 0.5", Outside Diameter (OD) of 1.375", and Thickness of 0.281-0.343", designed to meet common inch system fastener requirements. The raised grid width is 0.219" and indented grid width is 0.281", ensuring consistent performance. It is manufactured from Buna-N rubber with a hardness of Durometer 63A and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial and commercial applications.