S-91251A822 5/8"-11 x 8" 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 coating extends service life in demanding industrial environments
- Precise Class 3A thread fit provides secure engagement and vibration resistance for critical assemblies
- Partially threaded design offers optimal clamping force distribution and prevents thread damage during installation
- High hardness rating (Rockwell C37) maintains structural integrity under heavy loads and repeated use
- Standard hex drive compatibility allows for easy installation with common 1/2" tools in confined spaces
- Comprehensive compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental responsibility
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel socket head cap screws deliver exceptional performance where reliability is paramount. The coarse UNRC thread configuration provides rapid assembly in structural steel, machinery, and equipment manufacturing, while the partially threaded shank design concentrates clamping force precisely where needed. The corrosion-resistant black-oxide surface treatment protects against environmental degradation in manufacturing plants, construction sites, and outdoor equipment. With their high tensile strength and precise Class 3A thread fit, these fasteners prevent loosening under vibration and maintain joint integrity in critical connections, making them ideal for applications requiring repeated disassembly and reassembly without performance degradation.
Specification Summary & Compliance
This 5/8"-11 socket head cap screw features Class 3A thread fit with coarse UNRC threads and a minimum thread length of 1-3/4" on an 8" partially threaded shank. Manufactured to ASTM A574 specifications with Rockwell C37 hardness and 170,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
