S-91251A922 1"-8 x 4 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 finish on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- High torque capability with the 3/4" hex drive socket head, allowing for easy installation and removal with standard tools.
- Coarse UNRC 1"-8 threads enable quick assembly and disassembly, saving time in maintenance and production cycles.
- Partially threaded design offers optimal grip and clamping force, ideal for applications requiring precise load distribution.
- Compliance with ASTM A574 and environmental standards (RoHS 3, REACH) ensures quality and safety for global industrial use.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in harsh conditions. The Class 3A thread fit and coarse UNRC 1"-8 thread provide excellent resistance to dynamic loads, making it ideal for heavy machinery, automotive assemblies, and construction equipment. Its high tensile strength and Rockwell C37 hardness ensure durability under extreme pressure, while the partially threaded rod design allows for precise clamping in structural applications. By meeting ASTM A574 specifications, it delivers consistent performance, reducing downtime and maintenance costs in industrial screw fastening systems.
Specification Summary & Compliance
This screw features a 1"-8 coarse thread with Class 3A fit for precise dimensional accuracy, adhering to UNRC thread standards. It complies with ASTM A574 manufacturing specifications and is certified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for industrial use.
