S-98038A268 0.688" ID x 1.312" OD ASTM F436 Type 1 Structural Washers

Key Features & Benefits at a Glance

• Superior load distribution with precise 0.688" ID and 1.312" OD dimensions for optimal force spreading under bolt heads and nuts
• Exceptional durability provided by Rockwell C38 hardness steel construction, resisting deformation under high-stress conditions
• Reliable performance compliance meeting ASTM F436 Type 1 specifications for consistent quality in structural applications
• Environmental regulation adherence with full RoHS 3 and REACH compliance for safe use in regulated industries
• Precision engineering ensuring perfect fit for 5/8" screws with consistent thickness between 0.122-0.177"
• Long-term corrosion resistance through high-grade steel material selection for extended service life
• Versatile industrial application suitable for machinery, structural steel connections, and heavy equipment assembly

Professional Applications & Engineering Value

These ASTM F436 Type 1 flat washers deliver critical engineering solutions for industrial fastening challenges where load distribution and joint integrity are paramount. The steel construction with Rockwell C38 hardness provides exceptional resistance to embedding and deformation, preventing joint loosening in vibrating environments common to heavy machinery and structural applications. The precise 0.688" ID ensures perfect alignment with 5/8" screws, while the 1.312" OD creates an optimal bearing surface to distribute clamping forces across a wider area. This combination addresses common failure points in industrial washers, making them ideal for construction equipment, manufacturing machinery, and structural steel connections where reliable mechanical fasteners are essential for operational safety and longevity.

Specification Summary & Compliance

These precision flat washers feature inch system dimensions with 0.688" internal diameter, 1.312" outer diameter, and thickness ranging 0.122-0.177" for consistent performance. Manufactured to ASTM F436 Type 1 specifications for structural applications, they maintain dimensional accuracy and mechanical properties required for critical joints. The washers are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance across global markets.