S-90443A110 4.1 mm ID x 9.7 mm OD FDA Compliant 21 CFR 177.2600; 3-A Certified 18-03; NSF/ANSI 51 Sanitary Bonded Sealing Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for long-lasting performance in harsh, wet environments
• Reliable sealing provided by the bonded EPDM rubber (Durometer 70A) to prevent fluid and contaminant ingress
• Broad temperature tolerance from -40°F to 300°F, ensuring consistent performance in both freezing and high-heat processes
• Full regulatory compliance for food safety, meeting FDA 21 CFR 177.2600, 3-A 18-03, and NSF/ANSI 51 standards
• Precise M4 screw fit with 4.1mm ID and 9.7mm OD for secure, vibration-resistant fastening in sanitary equipment
• Environmental responsibility with RoHS 3 and REACH compliance, safe for use in regulated industries
• Optimized for sanitary applications with a smooth, cleanable surface and black EPDM seal for easy visual inspection

Professional Applications & Engineering Value

This M4 metal bonded washer is engineered to solve critical challenges in food industry and sanitary applications. The combination of 316 stainless steel and EPDM rubber seal creates a durable barrier against moisture, chemicals, and microbial contamination, addressing the primary concern of equipment hygiene maintenance. The metal bonded construction ensures the seal remains securely in place during vibration and thermal cycling, preventing leaks that could compromise product quality. With its temperature resistance from -40°F to 300°F, this washer maintains sealing integrity through cleaning cycles and processing variations, reducing maintenance downtime and replacement costs in food processing machinery, pharmaceutical equipment, and beverage manufacturing systems where FDA compliance and 3-A certification are mandatory requirements.

Specification Summary & Compliance

This metric metal bonded washer features precise dimensions: 4.1mm ID, 9.7mm OD, and 1mm thickness, designed for M4 screw applications. The product meets FDA Compliant 21 CFR 177.2600, 3-A Certified 18-03, and NSF/ANSI 51 standards for food equipment materials. Additionally, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industrial environments.