S-98038A313 2.657" ID x 4.5" OD ASTM F436 Type 1 Structural Washers

Key Features & Benefits at a Glance

• Superior load distribution with large 4.5" outer diameter to prevent surface damage and joint loosening under heavy loads
• Exceptional durability from Rockwell C38 hardness steel, resisting deformation in high-stress industrial environments
• Precise compatibility with 2 1/2" screw sizes thanks to accurate 2.657" inner diameter manufacturing
• Reliable performance certification through ASTM F436 Type 1 compliance, ensuring consistent quality and mechanical properties
• Enhanced corrosion resistance with steel construction meeting rigorous environmental standards
• Regulatory compliance assurance with RoHS 3 and REACH compliance for global industrial applications
• Optimized thickness range (0.240-0.340") providing ideal compression and spacing for various assembly requirements

Professional Applications & Engineering Value

This ASTM F436 Type 1 steel flat washer delivers critical engineering solutions for heavy-duty applications where load distribution and structural integrity are paramount. The Rockwell C38 hardness ensures the washer maintains its shape under extreme pressure, preventing bolt loosening and surface damage in construction, machinery, and infrastructure projects. With its substantial 4.5" outer diameter and precise 2.657" inner diameter for 2 1/2" screw sizes, this industrial-grade washer effectively spreads clamping force across wider surfaces, protecting sensitive materials and maintaining joint stability. The inch system measurement and standardized dimensions make it ideal for North American industrial equipment, bridge construction, and heavy machinery assemblies where reliable fastener performance cannot be compromised.

Specification Summary & Compliance

This flat washer features precise dimensional specifications including 2.657" inner diameter, 4.5" outer diameter, and thickness range of 0.240-0.340" for optimal performance with 2 1/2" screw sizes. Manufactured from steel with Rockwell C38 hardness, the product strictly complies with ASTM F436 Type 1 standards for mechanical properties and quality assurance. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring suitability for regulated industrial applications worldwide.