S-98019A385 0.344" ID x 0.688" OD MS15795-812; NASM15795; ASME B18.21.1 Mil. Spec. Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength with Rockwell B70 hardness, ensuring reliable load distribution and resistance to deformation under pressure.
• Precision dimensional accuracy with 0.688" OD, 0.344" ID, and 0.051-0.080" thickness for consistent fit and optimal performance in 5/16" screw applications.
• Rigorous compliance with multiple standards including MS15795-812, NASM15795, and ASME B18.21.1, guaranteeing interchangeability and quality assurance.
• Enhanced durability in demanding conditions due to robust material properties, reducing maintenance needs and replacement frequency.
• Environmental and regulatory safety with full RoHS 3 and REACH compliance, supporting sustainable and safe industrial operations.
• Versatile inch system compatibility for seamless integration into existing assemblies without conversion issues.

Professional Applications & Engineering Value

This 5/16" flat washer delivers critical engineering value by addressing common industrial challenges such as fastener loosening, surface damage, and corrosion-induced failure. Crafted from passivated 18-8 stainless steel, it provides a durable barrier against moisture, chemicals, and oxidation, making it suitable for aircraft assemblies, heavy machinery, and marine equipment where reliability is paramount. The precise inch system dimensions and adherence to MS15795-812, NASM15795, and ASME B18.21.1 standards ensure consistent performance under high vibration and load, minimizing downtime and enhancing assembly integrity. Its Rockwell B70 hardness further prevents wear, offering long-term cost savings in maintenance-intensive sectors.

Specification Summary & Compliance

This washer meets precise dimensional tolerances with an ID of 0.344", OD of 0.688", and thickness range of 0.051-0.080", designed for 5/16" screw sizes in inch-based systems. It conforms to MS15795-812, NASM15795, and ASME B18.21.1 specifications, ensuring high-quality manufacturing and performance consistency. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental safety and regulatory adherence in global supply chains.