S-98038A311 1.875" ID x 3.375" OD ASTM F436 Type 1 Structural Washers

Key Features & Benefits at a Glance

• Superior load distribution with a large 3.375" outer diameter to prevent surface damage and embedment in soft materials
• Precise fit and alignment ensured by the 1.875" inner diameter, designed specifically for 1 3/4" screw sizes
• Exceptional hardness and durability with Rockwell C38 rating to resist deformation under high torque and heavy loads
• Reliable performance in demanding environments thanks to ASTM F436 Type 1 certification for consistent quality and mechanical properties
• Enhanced corrosion resistance from high-quality steel construction, extending service life in industrial settings
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries
• Versatile thickness range (0.178-0.280") allowing for fine-tuning in assembly to accommodate varying gap and tension requirements

Professional Applications & Engineering Value

This ASTM F436 Type 1 steel flat washer is engineered to address critical challenges in heavy-duty industrial applications, such as construction, machinery assembly, and structural steel connections. Its robust inch system dimensions (1.875" ID x 3.375" OD) provide optimal load distribution, reducing stress concentrations and preventing joint failure under dynamic or static loads. The high-strength steel material and precise Rockwell C38 hardness ensure consistent performance in environments with vibration, thermal cycling, and high-pressure conditions. By utilizing this flat washer, engineers can achieve reliable bolt preload, minimize loosening, and enhance the longevity of fastened assemblies, making it ideal for industrial washers requirements in infrastructure, manufacturing, and mechanical systems where safety and durability are paramount.

Specification Summary & Compliance

This flat washer meets ASTM F436 Type 1 specifications, ensuring dimensional accuracy and mechanical properties for inch-based applications. It features precise inner diameter (1.875"), outer diameter (3.375"), and thickness range (0.178-0.280") tailored for 1 3/4" screw sizes. The washer is manufactured from high-grade steel with a Rockwell C38 hardness for reliable performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming adherence to environmental and safety standards for industrial use.