S-97449A101 Steel Pronged Lock Washers for Square-Neck Carriage Bolts

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Precise square hole alignment with 0.27" inside width ensures secure fit and prevents rotation with 1/4" fasteners
• Exceptional durability backed by Rockwell B47 hardness rating for reliable performance under heavy loads
• Optimized load distribution through 1.1" outer diameter design, reducing surface pressure and material stress
• Consistent dimensional accuracy with 0.044-0.051" thickness range for uniform clamping force and assembly reliability
• Full regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
• Inch system compatibility ensures seamless integration with existing North American industrial equipment and standards

Professional Applications & Engineering Value

This zinc-plated steel square hole washer delivers critical engineering solutions for industrial applications where standard round washers would rotate or loosen under vibration. The square hole design provides positive engagement with square-neck bolts and specialized fasteners, eliminating rotational slippage in heavy machinery, structural steel connections, and automotive assemblies. The zinc plating creates a sacrificial barrier against corrosion, making these industrial washers ideal for outdoor equipment, manufacturing facilities, and marine-adjacent applications. With precise dimensions tailored for 1/4" screw size applications, these washers ensure proper load distribution while maintaining Rockwell B47 hardness to prevent deformation under high torque conditions. The combination of mechanical reliability and environmental compliance makes them suitable for OEM manufacturing, MRO operations, and infrastructure projects requiring durable fastening solutions.

Specification Summary & Compliance

This square hole washer features inch system dimensions with 1.1" OD, 0.27" inside width, and thickness range of 0.044-0.051" specifically engineered for 1/4" screw applications. Manufactured from zinc-plated steel with Rockwell B47 hardness rating, these washers comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they meet current environmental and safety standards for industrial components. The square hole configuration provides secure anti-rotation performance in demanding fastening applications.