S-99604A142 4.3 mm ID x 9 mm OD FDA Compliant 21 CFR 177.2600 Rubber Sealing Washers

Key Features & Benefits at a Glance

• Food-Safe Compliance – FDA 21 CFR 177.2600 certification ensures safe use in food processing equipment without contamination risks.
• Exceptional Temperature Resilience – Maintains sealing integrity across a wide range from -80°F to 450°F, ideal for thermal cycling environments.
• Chemical & Environmental Resistance – Silicone rubber construction resists oils, chemicals, and moisture, extending service life in harsh conditions.
• Optimized Hardness for Sealing – Durometer 60A provides ideal compression and recovery for reliable, long-term leak prevention.
• Precision Metric Sizing – 4.3mm ID and 9mm OD ensure accurate fit with M4 screws, reducing installation errors.
• Regulatory Conformity – RoHS 3 and REACH compliance supports global supply chain requirements and environmental safety.
• Vivid Color Coding – Red silicone material allows for quick visual identification in complex assemblies.

Professional Applications & Engineering Value

This M4 silicone rubber flat washer is engineered to address critical sealing challenges in food industry and industrial applications. Its FDA-compliant silicone rubber material prevents microbial growth and withstands aggressive cleaning agents, ensuring hygiene and durability. The high-temperature resistance from -80°F to 450°F makes it suitable for ovens, freezers, and sterilization equipment, where thermal expansion can compromise inferior seals. With a Durometer 60A hardness, it offers optimal compression set recovery, maintaining a tight seal under vibration and pressure fluctuations. The precise 4.3x9mm metric dimensions and flat washer design provide uniform load distribution, reducing stress on M4 fasteners and preventing leaks in pumps, mixers, and food processing machinery.

Specification Summary & Compliance

This washer meets exacting standards with an inner diameter of 4.3mm, outer diameter of 9mm, and thickness range of 1.320mm–1.820mm, ensuring compatibility with M4 screw sizes. It conforms to FDA 21 CFR 177.2600 for food contact, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) for chemical safety, supporting use in regulated environments.