S-90718A130 4.3 mm ID x 9 mm OD UL 94 HB Plastic Washers

Key Features & Benefits at a Glance

• Enhanced durability and strength with glass-filled nylon construction, resisting wear in demanding industrial environments
• Reliable thermal performance withstanding temperatures up to 220°F for stable operation in varied conditions
• Consistent dimensional accuracy with precise 4.3mm ID and 9mm OD for secure M4 screw fits and reduced assembly issues
• Superior hardness and load distribution from Rockwell M111 rating, minimizing surface damage and extending component life
• Safety and regulatory compliance with UL 94 HB flame resistance and RoHS 3/REACH adherence for global market access
• Lightweight and corrosion-resistant white plastic design, ideal for electrical and moisture-prone applications without added weight
• Cost-effective maintenance due to long-lasting material properties, lowering replacement frequency and total ownership costs

Professional Applications & Engineering Value

This M4 metric flat washer is engineered from glass-filled nylon plastic to address common industrial challenges such as corrosion, electrical insulation needs, and weight reduction. The material's inherent properties provide excellent resistance to chemicals and moisture, making it ideal for electrical enclosures, automotive assemblies, and outdoor equipment. With a maximum temperature resistance of 220°F, it ensures reliable performance in environments with thermal fluctuations, while the flat washer design distributes load evenly to prevent fastener loosening and surface indentation. By integrating UL 94 HB certification, it meets stringent safety standards, reducing risks in applications where flame retardancy is critical. This washer simplifies compliance and enhances durability in metric-based systems, offering a robust solution for engineers seeking longevity and regulatory alignment.

Specification Summary & Compliance

This washer features precise metric dimensions with an ID of 4.3mm and OD of 9mm, tailored for M4 screw sizes to ensure accurate fit and function. It complies with UL 94 HB for flame resistance and adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and global industrial use. The Rockwell M111 hardness and material specifications guarantee consistent performance under standard operating conditions.