S-98019A399 0.406" ID x 0.812" OD MS15795-814; NASM15795; ASME B18.21.1 Mil. Spec. Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to Passivated 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Exceptional durability and load distribution with Rockwell B70 hardness for long-lasting performance under heavy loads
• Precise dimensional fit with 0.406" ID and 0.812" OD ensuring reliable seating for 3/8" screws
• Guaranteed compliance with major industry standards including MS15795-814, NASM15795, and ASME B18.21.1
• Consistent thickness control (0.051-0.080") for uniform pressure distribution and vibration resistance
• Environmental and safety compliance with RoHS 3 and REACH regulations for responsible sourcing
• Broad industrial compatibility in inch measurement systems for seamless integration into existing assemblies

Professional Applications & Engineering Value

This flat washer is engineered to address critical challenges in industrial fastening, such as galvanic corrosion and joint failure. Constructed from Passivated 18-8 Stainless Steel, it provides excellent resistance to rust and chemical exposure, making it suitable for demanding environments like marine, chemical processing, and outdoor machinery. The precise 0.406" ID and 0.812" OD ensure a snug fit on 3/8" screws, preventing misalignment and distributing clamp load evenly to protect sensitive components from damage. By meeting MS15795-814 and NASM15795 specifications, it delivers reliability in aerospace, automotive, and heavy equipment applications where fastener integrity is non-negotiable.

Specification Summary & Compliance

This washer features an internal diameter of 0.406", outer diameter of 0.812", and thickness range of 0.051-0.080", designed for use with 3/8" screw size. It conforms to MS15795-814, NASM15795, and ASME B18.21.1 standards, ensuring dimensional accuracy and performance consistency. The material is Passivated 18-8 Stainless Steel with a hardness of Rockwell B70. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility.