S-98038A111 1.531" ID x 2.75" OD ASTM F436 Type 1 Structural Washers

Key Features & Benefits at a Glance

• Exceptional Load Distribution - Large 2.75" OD and 1.531" ID provide superior surface coverage, preventing joint loosening and material damage under heavy loads
• Certified High-Strength Performance - Meets ASTM F436 Type 1 specifications, ensuring reliable performance in critical structural and mechanical applications
• Optimized Hardness for Durability - Rockwell C38 hardness rating delivers excellent resistance to deformation and wear in demanding environments
• Precision Fit for 1 3/8" Screws - Specifically engineered inner diameter ensures secure fastening and prevents movement in industrial assemblies
• Consistent Thickness Control - 0.136-0.177" thickness range maintains uniform pressure distribution across the fastened surface
• Regulatory Compliance Assurance - REACH compliant construction guarantees environmental responsibility and chemical safety in your operations
• Heavy-Duty Industrial Reliability - Steel construction provides corrosion resistance and long-term performance in construction and mechanical applications

Professional Applications & Engineering Value

This ASTM F436 Type 1 certified steel flat washer delivers critical engineering solutions for industrial applications where vibration resistance and load distribution are paramount. The precisely calibrated 1.531" inner diameter ensures perfect compatibility with 1 3/8" screw sizes, eliminating play and maintaining joint integrity in heavy machinery, structural steel connections, and industrial equipment. The Rockwell C38 hardness provides exceptional resistance to embedding and deformation under extreme pressure, while the 2.75" outer diameter maximizes surface contact to prevent material crushing. Engineered for construction, manufacturing, and mechanical assemblies, this heavy-duty washer addresses common failure points in high-stress environments, ensuring long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This precision steel flat washer features dimensional specifications of 1.531" ID, 2.75" OD, and 0.136-0.177" thickness, manufactured to exacting inch system tolerances. The product complies with ASTM F436 Type 1 standards for hardened steel washers and maintains full REACH (EC 1907/2006) compliance (06/14/2023, 235 SVHC). The Rockwell C38 hardness rating ensures consistent mechanical properties and performance reliability across all production batches, meeting industrial requirements for high-strength fastening applications.