S-90452A109 Washers for Square-Neck Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in harsh environments
• Perfect fit and secure fastening with precisely engineered 0.555" inside width designed specifically for 1/2" screws
• Enhanced load distribution from the 1" outer diameter, reducing surface pressure and material stress
• Consistent dimensional stability with 0.055-0.065" thickness range ensuring reliable performance in assembly operations
• Square hole design provides anti-rotation security, preventing washer movement during vibration or torque applications
• Environmental compliance assurance meeting RoHS 3 and REACH standards for safe industrial usage
• Durable steel core material delivers excellent strength and longevity for heavy-duty applications

Professional Applications & Engineering Value

This zinc-plated steel square hole washer addresses critical industrial fastening challenges where corrosion resistance and anti-rotation properties are paramount. The 1" OD provides substantial bearing surface, effectively distributing clamp load across wider areas to prevent material deformation in soft substrates. The precisely machined 0.555" inside width ensures optimal compatibility with 1/2" screws, eliminating play and maintaining alignment in high-vibration environments common in machinery, structural steelwork, and heavy equipment assembly. The square hole configuration positively engages with square-neck bolts, preventing rotation during tightening and in service – a crucial feature for maintenance accessibility and safety-critical connections. The zinc plating offers sacrificial protection against oxidation, significantly extending service intervals in outdoor, marine, or chemically exposed applications while maintaining electrical conductivity for grounding purposes.

Specification Summary & Compliance

This square hole washer features inch system dimensions with 1" outer diameter, 0.055-0.065" thickness range, and 0.555" inside width specifically engineered for 1/2" screw size applications. Manufactured from zinc-plated steel for corrosion protection, the product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage in industrial settings with strict chemical substance restrictions.