S-90044A527 1/4"-20 x 3 3/4" ASME B18.3, ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional mechanical strength with 170,000 psi tensile rating for heavy-duty applications requiring reliable load-bearing capacity
- Precision thread engagement with Class 3A fit ensuring vibration-resistant, secure fastening in critical assemblies
- Optimized drive efficiency through hex socket design providing superior torque transmission and strip-resistant installation
- Enhanced durability from Rockwell C37 hardened alloy steel construction resisting deformation under extreme stress
- Broad compatibility with standard 3/16" hex tools and UNRC coarse threads for simplified maintenance and replacement
- Regulatory compliance meeting RoHS 3 and REACH environmental standards for global manufacturing applications
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical performance advantages for industrial machinery, automotive systems, and heavy equipment assemblies. The Class 3A thread fit maintains precise tolerances in high-vibration environments, while the coarse UNRC thread form enables rapid installation in structural applications. Engineered with 170,000 psi tensile strength and Rockwell C37 hardness, this fastener resists shear failure in dynamic loading conditions. The hex drive configuration provides reliable torque transmission for confined space applications, making it ideal for precision manufacturing, robotics, and aerospace components where socket head cap screws require both strength and accessibility.
Specification Summary & Compliance
Manufactured to ASME B18.3 dimensional standards with Class 3A thread tolerances for precision fit. The 1/4"-20 coarse thread configuration follows UNRC specifications with full threading along the 3 3/4" length. Compliant with ASTM A574 material specifications, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) substance regulations for international industrial use.
