S-91251A090 1/4"-20 x 5" 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.
- Durable black-oxide coating on alloy steel provides corrosion resistance, extending service life in demanding industrial environments.
- Precise Class 3A thread fit offers superior engagement and vibration resistance, maintaining secure connections over time.
- Hex socket drive design allows for easy installation in confined spaces with standard tools, improving assembly efficiency.
- Partially threaded shank enables accurate clamping force distribution, ideal for components requiring precise positioning.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global industrial use.
- Coarse UNC thread facilitates quick assembly and disassembly, saving time in maintenance and repair operations.
Professional Applications & Engineering Value
Engineered for rigorous industrial settings, these black-oxide alloy steel socket head cap screws combine high tensile strength and Rockwell C37 hardness to withstand extreme mechanical loads without stripping or shearing. The UNC coarse thread and Class 3A fit ensure rapid, secure fastening in machinery, automotive assemblies, and heavy equipment, where vibration resistance is critical. The partially threaded design allows for focused clamping on specific components, reducing stress concentration. Ideal for high-performance applications, these screws meet ASTM A574 specifications for consistent quality, while the black-oxide surface treatment enhances durability against wear and mild corrosion, extending maintenance intervals.
Specification Summary & Compliance
This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A tolerance for precise fit, a minimum thread length of 1 inch, and a 5-inch overall length. Manufactured in compliance with ASTM A574 for material and mechanical properties, it adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for industrial use worldwide.
