S-91081A039 1.25" ID x 2.75" 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 2.75" outer diameter to prevent surface damage and material embedment
- Precision fit for 1 1/8" fasteners with 1.25" inner diameter ensuring secure assembly alignment
- Robust steel construction provides reliable strength and durability for demanding industrial applications
- Standardized thickness range (0.136-0.192") maintains consistent clamping force across installations
- Full compliance with ASME B18.21.1 ensures dimensional accuracy and interchangeability
- Environmental regulation compliance with RoHS 3 and REACH for global supply chain acceptance
- Heavy-duty performance in inch measurement system for seamless integration with existing equipment
Professional Applications & Engineering Value
This USS flat washer delivers critical engineering solutions where load distribution and surface protection are paramount. The steel construction and substantial 2.75" OD create an optimal bearing surface that prevents fastener head embedment into soft materials and distributes clamping force across wider areas. Engineered specifically for 1 1/8" screw size applications, this washer addresses common industrial challenges including joint relaxation, material deformation, and vibration-induced loosening. The ASME B18.21.1 compliance guarantees dimensional consistency for maintenance operations and replacement part sourcing. Ideal for structural steel connections, heavy machinery assembly, and construction applications where reliable flat washer performance is non-negotiable.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 dimensional standards with 1.25" ID and 2.75" OD specifications. Features thickness range of 0.136-0.192" for consistent performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial markets. Designed for use with 1 1/8" screw size fasteners in inch measurement system applications.
