S-91081A030 0.375" ID x 0.875" OD ASME B18.21.1 USS Washers
USS Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior load distribution with 0.875" outer diameter to prevent surface damage and embedment
- Precise 0.375" inner diameter ensures perfect fit for 5/16" fasteners without binding or misalignment
- Heavy-duty steel construction provides reliable strength and durability for demanding industrial environments
- ASME B18.21.1 compliance guarantees consistent dimensional accuracy and interchangeability
- RoHS 3 & REACH compliant meeting strict environmental regulations for global supply chain compatibility
- Versatile 0.064-0.104" thickness range accommodates various compression requirements and gap filling needs
- USS standard design delivers proven performance in heavy machinery and structural applications
Professional Applications & Engineering Value
These USS flat washers are engineered to solve critical load distribution challenges in heavy-duty assemblies. The steel construction provides essential strength to prevent fastener loosening under vibration and thermal cycling, while the precise 0.375" ID ensures proper alignment with 5/16" screws to eliminate cross-threading issues. The generous 0.875" OD creates an optimal bearing surface that protects soft materials from crushing and distributes clamping forces evenly across joints. Ideal for structural steel connections, machinery bases, and industrial equipment where reliable fastener performance is critical, these inch system washers deliver consistent performance in demanding applications from manufacturing plants to construction sites.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards ensuring precise dimensional control for the 0.375" inner diameter, 0.875" outer diameter, and 0.064-0.104" thickness range. These flat washers maintain proper Class 2A fit for 5/16" fasteners and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for international industrial applications requiring verified material safety and performance standards.
