S-91081A042 1.5" ID x 3.25" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Enhanced Load Distribution - The 3.25" outer diameter provides a wider bearing surface, reducing surface pressure and preventing damage to assembled materials.
• Reliable Fastener Fit - Precisely engineered 1.5" inner diameter ensures a secure fit for 1 3/8" screws, minimizing loosening from vibration or stress.
• Robust Construction - Made from durable steel, this washer offers excellent strength and longevity in demanding industrial environments.
• Standardized Performance - Compliance with ASME B18.21.1 ensures consistent dimensions, quality, and interchangeability for reliable assembly processes.
• Versatile Thickness Range - The 0.153-0.213" thickness provides flexibility to absorb shock and compensate for minor gaps in various applications.
• Environmental Responsibility - Meets RoHS 3 and REACH compliance, ensuring safety for users and the environment in global supply chains.
• Broad Industrial Compatibility - Designed for inch-system fasteners, making it ideal for construction, machinery, and heavy equipment maintenance.

Professional Applications & Engineering Value

This USS flat washer is engineered to solve critical issues in heavy-duty applications where vibration, high loads, and material stress are common. The steel construction provides essential tensile strength to prevent fastener failure, while the large 3.25" OD effectively distributes clamping force over a wider area, protecting soft or fragile surfaces from indentation and fatigue. Its 1.5" ID is precision-matched to 1 3/8" screw sizes, ensuring a snug fit that reduces the risk of loosening under dynamic loads. Ideal for construction, industrial machinery, and structural steel connections, this washer’s compliance with ASME B18.21.1 guarantees dimensional consistency and reliability, streamlining procurement and assembly for engineers and maintenance teams.

Specification Summary & Compliance

This washer features an inner diameter of 1.5", outer diameter of 3.25", and thickness ranging from 0.153" to 0.213", designed for use with 1 3/8" screw sizes. It conforms to the ASME B18.21.1 standard, ensuring precise dimensional tolerances and mechanical properties for consistent performance. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.