S-91367A112 4.3 mm ID x 9 mm OD Rubber Sealing Washers

Key Features & Benefits at a Glance

• Exceptional thermal stability for reliable performance in extreme environments from -80°F to 450°F
• Superior chemical resistance thanks to fluorosilicone rubber construction, ideal for harsh industrial applications
• Consistent sealing performance with Durometer 60A hardness providing optimal compression and recovery
• Precision metric sizing with 4.3mm ID and 9mm OD ensures perfect fit for M4 screws in demanding assemblies
• Enhanced durability with controlled thickness (1.320mm-1.820mm) for long service life under compression
• Regulatory compliance with RoHS 3 and REACH standards for safe use in regulated industries
• Easy identification through distinctive blue color coding for efficient inventory management

Professional Applications & Engineering Value

This fluorosilicone rubber flat washer delivers critical engineering solutions for applications where conventional rubber components fail. The M4 metric flat washer maintains its sealing integrity and mechanical properties across an extreme temperature spectrum from -80°F to 450°F, making it indispensable for automotive, aerospace, and industrial equipment exposed to thermal cycling. The fluorosilicone material provides exceptional resistance to fuels, oils, solvents, and chemicals that typically degrade standard rubber washers. With precise 4.3mm ID and 9mm OD dimensions, this blue washer ensures proper fit and consistent compression for M4 fasteners in critical assemblies, preventing leakage and maintaining joint integrity in demanding environments where temperature fluctuations and chemical exposure compromise ordinary sealing solutions.

Specification Summary & Compliance

This metric flat washer features precise dimensional specifications including 4.3mm internal diameter, 9mm outer diameter, and thickness ranging from 1.320mm to 1.820mm, engineered for M4 screw applications. The component maintains consistent performance with Durometer 60A hardness and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring regulatory compliance for industrial use across global markets.