S-90443A180 4.1 mm ID x 9.7 mm OD FDA Compliant 21 CFR 177.2600 Sanitary Bonded Sealing Washers

Key Features & Benefits at a Glance

• Food-Grade Safety: FDA 21 CFR 177.2600 compliance ensures suitability for direct contact in food processing, preventing contamination.
• Exceptional Corrosion Resistance: 316 stainless steel construction withstands harsh cleaning agents and humid environments, extending service life.
• Reliable Sealing Under Pressure: Bonded blue fluoroprene fluoroelastomer rubber provides a durable, consistent seal to prevent fluid and contaminant ingress.
• Broad Temperature Tolerance: Maintains seal integrity and material properties in temperatures from 5°F to 390°F, ideal for varying process conditions.
• Optimized for M4 Fasteners: Precise 4.1 mm ID ensures a secure fit on M4 screws, reducing installation errors and improving assembly efficiency.
• Environmental Regulation Compliance: Meets RoHS 3 and REACH standards, supporting global supply chain requirements and sustainable procurement.
• Consistent Performance: Durometer 75A seal hardness offers an ideal balance of flexibility and compression set resistance for long-term reliability.

Professional Applications & Engineering Value

This M4 metal bonded washer is specifically engineered to address critical challenges in sanitary and food industry applications. The 316 stainless steel base provides superior resistance to corrosive cleaning chemicals and oxidation, while the permanently bonded fluoroprene fluoroelastomer rubber seal (color-coded blue for easy identification) ensures a leak-proof barrier against moisture, oils, and particulate matter. Its ability to perform across a wide temperature range from 5°F to 390°F makes it suitable for equipment that undergoes thermal cycling, such as mixers, conveyors, and filling machines. By integrating a metric washer that is both FDA compliant and built for durability, engineers can reduce maintenance frequency, prevent product contamination, and ensure compliance with stringent industry hygiene standards, thereby enhancing operational safety and equipment longevity.

Specification Summary & Compliance

This washer conforms to precise dimensional standards with an Inner Diameter (ID) of 4.1 mm, Outer Diameter (OD) of 9.7 mm, and 1 mm Thickness, designed for use with M4 screw sizes. It is manufactured to meet FDA 21 CFR 177.2600 for food contact materials, RoHS 3 (2015/863/EU) for restriction of hazardous substances, and REACH (EC 1907/2006) compliance, ensuring adherence to international safety and environmental regulations.