S-90377A157 0.266" ID x 1" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to Black-Oxide 18-8 Stainless Steel construction, ideal for harsh industrial environments.
• Excellent load distribution with a 1" OD, protecting surfaces and preventing fastener embedment.
• Precise fit for 1/4" screws with a 0.266" ID, ensuring secure and stable assembly.
• Durable and long-lasting performance from the 18-8 stainless steel material, resisting wear and degradation.
• Enhanced environmental protection with RoHS 3 and REACH compliance, safe for regulated applications.
• Versatile thickness range of 0.040-0.060" accommodates minor variations in assembly for reliable seating.
• Broad industrial compatibility in inch measurement system, fitting standard equipment and designs.

Professional Applications & Engineering Value

This Black-Oxide 18-8 Stainless Steel flat washer is engineered to address common industrial challenges such as corrosion, surface damage, and fastener loosening. The black-oxide surface treatment enhances corrosion resistance, making it suitable for outdoor, marine, or chemical-exposed environments where moisture and contaminants are concerns. Its 1" outer diameter provides a wide bearing surface, distributing clamp load effectively to prevent damage to soft materials and maintain joint integrity under vibration. Commonly used in machinery, automotive, and construction assemblies, this washer ensures reliable performance in heavy-duty applications, reducing maintenance needs and extending equipment life. The combination of material strength and precise dimensions supports efficient installation and long-term durability in demanding B2B settings.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.266", outer diameter of 1", and thickness range of 0.040-0.060", designed for use with 1/4" screw sizes in inch-based systems. Manufactured from 18-8 Stainless Steel with a black-oxide finish, it adheres to standard industrial specifications for fit and function. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety standards for hazardous substances, making it a responsible choice for global supply chains.