S-98029A044 0.344" ID x 0.688" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel construction, extending service life in demanding environments
• Optimal load distribution across 0.688" OD surface area, preventing joint loosening and material damage
• Precise 5/16" screw compatibility with 0.344" ID, ensuring secure fit and vibration resistance
• Enhanced durability with 0.105-0.130" thickness range, maintaining structural integrity under pressure
• Full regulatory compliance with RoHS 3 and REACH standards, meeting global industrial safety requirements
• Reliable performance in inch-system applications, eliminating metric conversion errors
• Versatile industrial suitability across machinery, construction, and commercial assemblies

Professional Applications & Engineering Value

These black-oxide steel flat washers deliver critical engineering solutions through their corrosion-resistant finish and precise dimensional control. The 0.344" ID ensures perfect alignment with 5/16" screws, eliminating play while the 0.688" OD distributes clamping forces evenly across fastened surfaces. This prevents stress concentration, material deformation, and joint failure in industrial applications ranging from heavy machinery to structural frameworks. The controlled 0.105-0.130" thickness provides consistent spacing and reliable performance in vibration-prone environments, making these flat washers essential components for maintenance-free assemblies requiring long-term reliability.

Specification Summary & Compliance

Manufactured to standard inch system dimensions with 0.344" inner diameter, 0.688" outer diameter, and 0.105-0.130" thickness range. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as steel alloying element and REACH (EC 1907/2006) regulations updated January 17, 2023. The black-oxide finish on steel substrate provides consistent performance for 5/16" screw applications in commercial and industrial settings.