S-90476A122 1.375" ID x 3" 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
- Exceptional load distribution with 3" outer diameter for superior surface coverage and reduced material stress
- Superior corrosion resistance through zinc yellow-chromate plating for extended service life in harsh environments
- High-strength performance with Grade 9 classification and Rockwell C43 hardness for demanding applications
- Precise dimensional fit with 1.375" inner diameter designed specifically for 1 1/4" screw sizes
- Industry-standard compliance meeting ASME B18.21.1 specifications for guaranteed quality and interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance for safe industrial use
- Optimized thickness range (0.136-0.192") providing ideal compression characteristics and vibration resistance
Professional Applications & Engineering Value
These Grade 9 USS flat washers deliver critical engineering solutions for heavy-duty industrial applications where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion resistance in demanding environments including construction, machinery assembly, and structural applications. The combination of Rockwell C43 hardness and Grade 9 strength classification ensures reliable performance under extreme loads and vibration, preventing joint loosening and material deformation. With precise 1.375" ID matching standard 1 1/4" screw sizes and generous 3" OD for optimal load distribution, these washers solve common engineering challenges of surface damage, bolt head embedment, and stress concentration in critical connections.
Specification Summary & Compliance
This USS flat washer features dimensional specifications of 1.375" inner diameter and 3" outer diameter with thickness ranging from 0.136" to 0.192". Manufactured from zinc yellow-chromate plated steel with Rockwell C43 hardness and Grade 9 strength classification. The product strictly conforms to ASME B18.21.1 dimensional standards and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both mechanical reliability and regulatory adherence for industrial applications.
