S-90459A102 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 corrosion resistance from aluminum construction, ideal for harsh environments without rust concerns
- Lightweight design reduces overall assembly weight while maintaining structural integrity
- Precise 5/16" screw compatibility ensures secure fit and even load distribution for fastened joints
- USS designation compliance guarantees dimensional accuracy and interchangeability in inch-system applications
- RoHS 3 and REACH compliance meets stringent environmental regulations for safe industrial use
- ASME B18.21.1 standard adherence provides reliable performance in mechanical and structural assemblies
- Optimized dimensions (0.375" ID, 0.875" OD) prevent bolt head/nut embedding and distribute pressure effectively
Professional Applications & Engineering Value
This aluminum flat washer with USS designation solves critical engineering challenges in weight-sensitive and corrosive environments. The aluminum material provides inherent corrosion resistance, eliminating galvanic corrosion issues common in mixed-metal assemblies while offering significant weight reduction advantages. The precise 5/16" screw size compatibility and flat washer design ensure proper seating and load distribution, preventing joint loosening under vibration. Particularly valuable in industrial applications requiring lightweight components, these washers maintain integrity in electrical enclosures, marine hardware, and aerospace assemblies where both performance and regulatory compliance are paramount. The combination of inch system measurements and standardized dimensions makes them ideal replacements in maintenance and OEM applications.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with inch system dimensions: 0.375" ID, 0.875" OD, and thickness range of 0.064-0.104". The USS flat washer designation ensures proper fit and function for 5/16" fasteners. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, verified against the latest SVHC list (updated 06/14/2023, 235 substances).
