S-91251A823 5/8"-11 x 8 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 in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide coating extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly integrity.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Partially threaded design allows for optimal clamping force distribution, ideal for applications requiring specific grip lengths.
- Coarse UNRC threads enable faster installation and better performance in materials prone to stripping or galling.
- 1/2" hex drive compatibility ensures easy installation with standard tools, reducing assembly time and labor costs.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and corrosion resistance are paramount. The UNRC coarse thread design prevents cross-threading in coarse-grained materials, while the partially threaded rod type concentrates clamping force precisely where needed, reducing stress concentration points. With its ASTM A574 compliance, it delivers consistent performance in dynamic load applications, making it ideal for structural assemblies, equipment frames, and hydraulic systems that demand reliable, long-term fastening solutions without frequent replacements.
Specification Summary & Compliance
This fastener features a 5/8"-11 thread size with Class 3A thread fit for precision tolerance, ensuring secure mating with nuts and tapped holes. It meets ASTM A574 specifications for high-strength socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.
