S-90339A035 Easy-Install Slotted Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance through black-oxide steel coating, extending service life in demanding industrial environments.
• Superior load distribution with a 1.5" outer diameter, minimizing surface pressure and preventing material damage.
• Precision slot alignment (13/32" width, 7/8" depth) ensures secure fit and easy installation with 5/16" and 3/8" screws.
• Exceptional mechanical durability from Rockwell 15N80 hardness, resisting deformation under high-stress applications.
• Regulatory compliance assurance with RoHS 3 and REACH standards, meeting global environmental and safety requirements.
• Consistent dimensional accuracy (0.365-0.385" thickness) for reliable performance in inch-based assembly systems.
• Versatile industrial compatibility designed for heavy-duty machinery, construction, and automotive fastening needs.

Professional Applications & Engineering Value

Engineered for rigorous industrial use, these black-oxide steel slotted washers address critical challenges in vibration-prone and corrosive environments. The Rockwell 15N80 hardness ensures minimal wear during dynamic loads, while the slotted design accommodates standard 5/16" and 3/8" screws for streamlined assembly in machinery, structural frameworks, and automotive subsystems. The black-oxide surface treatment provides a protective barrier against oxidation, reducing maintenance frequency in outdoor or humid settings. Ideal for heavy-duty washers applications, they deliver consistent clamping force and alignment stability, preventing loosening in high-torque scenarios. Their compliance with RoHS 3 and REACH makes them suitable for regulated industries, ensuring both performance and environmental responsibility.

Specification Summary & Compliance

This slotted washer adheres to inch system measurements with an OD of 1.5", thickness range of 0.365-0.385", slot width of 13/32", and slot depth of 7/8". It is manufactured to precise dimensional tolerances for compatibility with 5/16" and 3/8" screw sizes. The black-oxide steel construction meets Rockwell 15N80 hardness specifications for mechanical reliability. Compliance includes RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel alloys and full adherence to REACH (EC 1907/2006) SVHC requirements as of January 2023.