S-91251A131 5-40 x 3/4" 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 extends service life in demanding industrial environments.
- Precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies.
- High hardness rating (Rockwell C37) enhances wear resistance and durability under repetitive loads.
- Hex socket drive design allows for easy installation in confined spaces with standard tools.
- Coarse UNC threading enables quicker assembly and disassembly, improving maintenance efficiency.
- Full compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Black-Oxide Alloy Steel Socket Head Cap Screws address critical challenges in machinery, automotive, and equipment manufacturing. The 5-40 UNC coarse thread and Class 3A fit provide superior clamping force and vibration resistance, minimizing loosening in dynamic environments. The alloy steel construction combined with a black-oxide surface treatment offers excellent protection against rust and wear, extending component lifespan. With a hex drive and fully threaded design, these screws facilitate efficient assembly in tight spaces, reducing downtime and maintenance costs while meeting stringent ASTM A574 specifications for high-strength fasteners.
Specification Summary & Compliance
This socket head cap screw features a 5-40 UNC coarse thread with Class 3A precision fit for accurate engagement. Dimensions include a 3/4" length, 3/32" hex drive, and standard socket head profile. Manufactured in compliance with ASTM A574 for material and mechanical properties, and fully meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and reliable use across global industrial sectors.
