S-91251A971 9/16"-12 x 3" 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 provides superior resistance to mechanical failure in demanding applications.
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance for secure assemblies.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance and a professional appearance.
- 7/16" hex drive socket head allows for high torque application and easy installation in confined spaces.
- Fully threaded 3" length with coarse UNC threads enables deep, strong fastening across the entire shank.
- High hardness (Rockwell C37) increases wear resistance and extends the screw's service life.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical industrial challenges such as joint loosening under vibration and corrosion in harsh environments. The 9/16"-12 UNC coarse thread and Class 3A fit provide excellent holding power and alignment in heavy machinery, automotive assemblies, and construction equipment. Its alloy steel construction, combined with a black-oxide surface treatment, resists rust and wear, making it ideal for outdoor or high-moisture applications. The hex drive design ensures efficient torque transmission, reducing installation time and preventing tool slippage. These features make it a reliable choice for engineers seeking durable, high-strength fasteners that maintain integrity under extreme loads and conditions.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for accurate engagement. Dimensions include a 9/16"-12 thread size, 3" fully threaded length, and 7/16" hex drive. It meets ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.
