S-91251A950 1 1/4"-7 x 12" 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 for reliable performance in high-stress and heavy-duty applications.
- Superior corrosion resistance provided by the black-oxide finish, extending service life in demanding industrial environments.
- High hardness rating of Rockwell C37 ensures excellent wear resistance and durability under repetitive loads.
- Secure and efficient installation with a 7/8" hex drive, allowing for high torque application without slippage.
- Optimized thread engagement with a coarse UNRC thread and Class 2A fit for quick assembly and reliable holding power.
- Versatile partial threading on a 12" length provides flexibility for applications requiring both clamping and unthreaded shank benefits.
- Full regulatory compliance with ASTM A574, RoHS 3, and REACH, ensuring material quality and environmental safety.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to solve critical challenges in heavy machinery, construction, and manufacturing. The high tensile strength and Rockwell C37 hardness prevent failure under extreme vibration and load, while the coarse UNRC thread ensures rapid, secure fastening even in materials prone to stripping. The partially threaded design allows the unthreaded shank to bear shear loads effectively, making it ideal for precision assemblies requiring alignment and strength. Its black-oxide surface adds a layer of corrosion protection, reducing maintenance needs in harsh conditions. These features make it a top choice for engineers seeking durable, high-performance fasteners that meet rigorous industrial standards.
Specification Summary & Compliance
This screw features a 1 1/4"-7 UNRC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in accordance with ASTM A574 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for industrial use.
