S-90474A171 0.125" ID x 0.25" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Lightweight & Corrosion-Resistant: Made from aluminum, these washers offer excellent resistance to corrosion, extending the life of your assembly in various environments without adding significant weight.
• Precision Fit for No. 4 Screws: The 0.125" inner diameter ensures a perfect, secure fit on No. 4 screws, preventing misalignment and improving assembly accuracy.
• Optimized Load Distribution: With a 0.25" outer diameter, this washer effectively distributes pressure, protecting sensitive surfaces from damage and loosening under stress.
• Consistent & Reliable Thickness: The controlled 0.028-0.036" thickness provides uniform spacing and reliable performance in precision applications.
• Guaranteed Dimensional Accuracy: Manufactured in compliance with the ASME B18.21.1 standard, ensuring consistent quality, interchangeability, and reliable performance.
• Environmentally Compliant & Safe: Conforms to RoHS 3 and REACH regulations, making them suitable for use in regulated industries and environmentally conscious projects.
• Versatile Industrial Use: The combination of material and standard compliance makes these washers suitable for a wide range of mechanical fastening and industrial applications.

Professional Applications & Engineering Value

This aluminum flat washer is engineered to solve common fastening challenges in precision assemblies. Its lightweight aluminum construction is ideal for applications where weight reduction is critical, such as in aerospace components or portable electronics, without sacrificing performance. The corrosion-resistant nature of aluminum ensures long-term reliability in environments exposed to moisture or chemicals, preventing fastener failure. The precise dimensions, including the 0.125" ID for No. 4 screws and 0.25" OD, guarantee a perfect fit that minimizes play and distributes clamp load evenly, protecting delicate surfaces from indentation and reducing the risk of loosening due to vibration. Complying with the ASME B18.21.1 standard, these washers deliver consistent quality for industrial and mechanical fastening systems, ensuring they meet rigorous engineering demands for durability and precision.

Specification Summary & Compliance

This flat washer features an Inner Diameter (ID) of 0.125", Outer Diameter (OD) of 0.25", and a Thickness range of 0.028-0.036", designed specifically for use with No. 4 screw size. It is manufactured to meet the dimensional and material requirements of the ASME B18.21.1 standard, ensuring high precision and interchangeability. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant (as of 06/14/2023, 235 SVHC), adhering to strict environmental and safety regulations for hazardous substances.