S-91251A527 1/4"-20 x 1 5/8" 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, minimizing loosening over time.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
- Partially threaded shank offers optimal grip and clamping force control, ideal for components requiring specific unthreaded sections.
- Compliance with ASME B18.3 and ASTM A574 guarantees dimensional accuracy and material consistency for engineering-critical assemblies.
- RoHS 3 and REACH compliance ensures environmental and safety standards are met for global supply chain integration.
Professional Applications & Engineering Value
This 1/4"-20 socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in heavy machinery. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, provides durability against wear and environmental exposure. Featuring a coarse UNRC thread and Class 3A fit, it ensures rapid assembly and secure fastening in equipment like automotive frames, manufacturing tools, and aerospace components. The partially threaded design allows for precise clamping without compromising structural integrity, making it a reliable choice for engineers seeking long-term fastening solutions that meet rigorous ASME B18.3 specifications.
Specification Summary & Compliance
This screw adheres to ASME B18.3 dimensional standards with a Class 3A thread fit for tight tolerances and consistent performance. It is manufactured from alloy steel per ASTM A574, ensuring high tensile strength and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted substances and safe for industrial use worldwide.
