S-91251A093 1/4"-20 x 5 1/2" 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 under high-stress conditions, reducing the risk of fastener failure in demanding applications.
- Superior corrosion resistance from the black-oxide finish prolongs service life and maintains integrity in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- Coarse UNC threading enables quicker installation and easier alignment, saving time during assembly and maintenance.
- Partially threaded design offers optimal grip and clamping force where needed, enhancing joint stability without unnecessary thread engagement.
- Hex socket drive allows for high-torque application with standard tools, ensuring easy installation in confined spaces.
- Compliance with ASTM A574 guarantees consistent quality and mechanical properties, meeting rigorous industrial standards for reliability.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial use, this Black-Oxide Alloy Steel Socket Head Cap Screw addresses critical challenges in machinery, automotive, and construction sectors. The alloy steel construction, combined with a Rockwell C37 hardness, resists wear and deformation under repetitive loads, while the UNC coarse thread and Class 3A fit ensure secure fastening in high-vibration environments. The black-oxide surface treatment provides an added layer of corrosion resistance, making it ideal for applications exposed to moisture or chemicals. Its partially threaded rod and hex drive design facilitate efficient assembly in tight spaces, reducing installation time and improving overall structural integrity for industrial screws requiring durability and precision.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A precision fit, ensuring tight tolerances and reliable performance. It complies with ASTM A574 specifications for material and mechanical properties, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming its suitability for regulated industrial applications without hazardous substances.
