S-98038A289 1.375" ID x 2.5" OD ASTM F436 Type 1; ASME B18.21.1 Structural Washers

Key Features & Benefits at a Glance

• Superior load distribution with 2.5" OD and 1.375" ID, preventing surface damage and maintaining joint integrity under heavy loads
• Exceptional hardness and durability with Rockwell C38 rating, resisting deformation and extending service life in demanding applications
• Precision fit for 1 1/4" screws, ensuring secure fastening and reducing installation time with accurate dimensional consistency
• Compliance with ASTM F436 Type 1 and ASME B18.21.1 standards, guaranteeing reliable performance and interchangeability in industrial assemblies
• RoHS 3 and REACH environmental compliance, ensuring safe use in regulated industries without hazardous substance restrictions
• Optimized thickness range (0.136-0.177"), providing flexibility to absorb vibrations and compensate for minor surface irregularities
• Robust steel construction, offering excellent corrosion resistance and strength for long-term reliability in harsh environments

Professional Applications & Engineering Value

This ASTM F436 Type 1 steel flat washer is engineered to address critical challenges in industrial fastening systems, where uniform load distribution and vibration resistance are paramount. Its high Rockwell C38 hardness prevents embedding and distortion under extreme pressure, making it ideal for heavy machinery, structural steel connections, and automotive assemblies. The precise 1.375" ID and 2.5" OD ensure a perfect match for 1 1/4" screw sizes, reducing bolt loosening and maintenance costs. By meeting ASME B18.21.1 specifications, it delivers consistent performance in construction and manufacturing applications, enhancing safety and reducing downtime. The steel material and compliant design provide reliable service in corrosive or high-stress environments, supporting efficient B2B procurement for durable component solutions.

Specification Summary & Compliance

This flat washer adheres to ASTM F436 Type 1 and ASME B18.21.1 standards, ensuring precise dimensional accuracy with an inner diameter of 1.375", outer diameter of 2.5", and thickness ranging from 0.136" to 0.177" for consistent fit with 1 1/4" screw sizes. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for industrial safety and environmental responsibility.