S-90461A101 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 electrical conductivity for efficient current transfer in demanding electrical and grounding applications
- Excellent corrosion resistance ensuring long-term reliability and reduced maintenance in harsh environments
- Non-sparking properties for enhanced safety in potentially explosive or flammable atmospheres
- Precise USS type flat design with 0.375" ID and 0.875" OD for perfect fit with 5/16" screws and uniform load distribution
- ASME B18.21.1 compliance guaranteeing dimensional accuracy, consistent performance, and interchangeability
- RoHS 3 & REACH compliant construction meeting strict international environmental and safety standards
- Durable copper material providing excellent malleability and resistance to galling and seizing
Professional Applications & Engineering Value
These copper flat washers deliver critical performance advantages in electrical systems and corrosive environments where standard steel fasteners fail. The USS type design ensures reliable seating and pressure distribution for 5/16" screw applications, while the pure copper construction provides inherent electrical conductivity essential for grounding connections, bus bars, and electrical enclosures. Engineers specify these washers for their non-sparking characteristics in hazardous locations and exceptional corrosion resistance in marine, chemical processing, and outdoor applications. The combination of ASME B18.21.1 compliance and premium copper material solves common issues of electrical resistance, galvanic corrosion, and fastener degradation in critical industrial settings.
Specification Summary & Compliance
This USS type flat washer features precise dimensional specifications: 0.375" inner diameter, 0.875" outer diameter, and thickness ranging from 0.064" to 0.104". Manufactured to ASME B18.21.1 standards for dimensional consistency and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for global industrial applications.
