S-98044A216 4.3 mm ID x 9 mm OD DIN 125; ISO 7089 General Purpose Washers

Key Features & Benefits at a Glance

• Enhanced electrical conductivity for reliable performance in electrical systems and grounding applications
• Superior corrosion resistance ensuring long-term durability in harsh or humid environments
• Precise dimensional accuracy with 4.3mm ID and 9mm OD for consistent fit with M4 screws
• Compliance with DIN 125 and ISO 7089 standards guaranteeing interchangeability and quality in metric assemblies
• RoHS 3 and REACH compliant for safe use in regulated industries and environmentally sensitive applications
• Excellent malleability allowing for effective sealing and vibration damping in plumbing and mechanical joints
• Cost-effective copper material providing optimal performance without the high expense of precious metals

Professional Applications & Engineering Value

This M4 copper flat washer is engineered to address common industrial challenges such as galvanic corrosion, electrical continuity loss, and joint loosening under thermal cycling. Made from high-purity copper, it offers exceptional electrical conductivity, making it ideal for electrical panels, grounding systems, and busbar connections. The flat washer design conforms to DIN 125 and ISO 7089 standards, ensuring precise load distribution and preventing surface damage in metric assemblies. Its natural corrosion resistance eliminates the need for additional coatings, reducing maintenance in plumbing, HVAC, and automotive applications where moisture and chemicals are present. The 0.7-0.9 mm thickness provides reliable sealing in compressed joints, enhancing the longevity of electrical and mechanical systems.

Specification Summary & Compliance

This washer features an inner diameter of 4.3 mm, outer diameter of 9 mm, and thickness range of 0.7-0.9 mm, designed for M4 screw sizes in metric system applications. It conforms to DIN 125 and ISO 7089 standards for dimensional precision and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.