S-90452A107 Washers for Square-Neck Bolts

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for extended service life in harsh environments
• Secure anti-rotation performance thanks to the square hole design that prevents washer spin during 3/8" screw installation
• Superior load distribution from the 0.7" outer diameter, reducing surface pressure and material stress
• Precision dimensional control with 0.405" inside width ensuring perfect fit with square-shank fasteners
• Consistent thickness tolerance (0.055-0.065") for uniform clamping force and reliable joint integrity
• Global regulatory compliance meeting RoHS 3 and REACH standards for international industrial applications
• Heavy-duty construction in inch measurement system for compatibility with North American industrial equipment

Professional Applications & Engineering Value

This zinc-plated steel square hole washer solves critical industrial fastening challenges by combining corrosion-resistant protection with anti-rotation functionality. The precisely engineered 0.405" inside width and square hole design create a locking mechanism that prevents washer movement during vibration or dynamic loading conditions, making it ideal for heavy machinery, structural assemblies, and automotive applications. The 0.7" outer diameter provides optimal surface coverage while the zinc plating delivers reliable protection against rust and environmental degradation. Engineered for 3/8" fasteners in inch-system applications, this washer maintains joint integrity where standard round hole washers might fail, offering superior performance in high-stress industrial environments.

Specification Summary & Compliance

This square hole washer features inch system dimensions with 0.7" OD, 0.405" inside width, and thickness range of 0.055-0.065". Manufactured from zinc-plated steel for 3/8" screw applications, the product maintains dimensional consistency for reliable performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory acceptance for industrial use across global markets.