S-98689A251 4.2 mm ID x 8 mm OD General Purpose Washers
General Purpose Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance thanks to 18-8 stainless steel construction, ensuring long-term reliability in harsh environments.
- Precise dimensional fit with 4.2mm ID and 8mm OD designed specifically for M3.9 screws, preventing loosening and misalignment.
- Optimal load distribution with a controlled 0.2-0.4mm thickness, reducing surface pressure and protecting assembled components.
- Environmental compliance assurance meeting RoHS 3 and REACH standards, making them safe for regulated industries.
- Durable material performance from 18-8 stainless steel, offering excellent strength and resistance to oxidation.
- Versatile metric sizing compatible with standard M3.9 fasteners, ideal for international engineering projects.
- Enhanced assembly integrity by providing a reliable, flat bearing surface that maintains bolt tension and secures connections.
Professional Applications & Engineering Value
These M3.9 metric flat washers are precision-engineered from 18-8 stainless steel to address common industrial challenges such as galvanic corrosion, vibration-induced loosening, and surface damage. The flat washer design evenly distributes clamp load, preventing embedding into soft materials and maintaining joint integrity under dynamic stresses. Ideal for electronics assembly, automotive components, and machinery, the corrosion-resistant properties ensure performance in humid or chemically aggressive settings. By specifying these RoHS and REACH compliant washers, engineers mitigate compliance risks while achieving consistent, reliable fastening in metric-based systems.
Specification Summary & Compliance
This flat washer conforms to standard metric dimensions: 4.2mm inner diameter, 8mm outer diameter, and thickness between 0.2-0.4mm, ensuring compatibility with M3.9 screws. Manufactured from 18-8 stainless steel, it provides inherent corrosion resistance and mechanical durability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming adherence to stringent environmental and safety standards for industrial use.
