S-91251A821 5/8"-11 x 7 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 industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh environments, minimizing maintenance and replacement costs.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and tightening.
- Partially threaded design allows for optimal clamping force control, ideal for applications requiring specific grip lengths.
- Coarse UNRC threads enable quick installation and removal, saving time in assembly and maintenance operations.
- 1/2" hex drive compatibility ensures easy torque application with standard tools, improving installation efficiency.
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 coarse UNRC thread design prevents cross-threading and facilitates rapid assembly in high-vibration environments, while the partially threaded rod type ensures precise load distribution. With a Rockwell C37 hardness, it withstands abrasive conditions without deformation, making it ideal for industrial fasteners in equipment requiring durability and compliance with stringent standards like ASTM A574. Its black-oxide surface treatment provides an added layer of protection against rust, extending service life in outdoor or humid applications.
Specification Summary & Compliance
This socket head cap screw features a 5/8"-11 thread size with Class 3A thread fit for precise tolerance, adhering to UNRC coarse thread standards. It meets ASTM A574 specifications for material quality and performance, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
