S-91253A713 1/2"-13 x 1 1/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat 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 durability with Rockwell C39 hardness and 130,000 psi tensile strength for long-lasting performance in demanding environments.
- Superior torque transfer via the 5/16" hex drive, ensuring secure installation and reducing tool slippage.
- Reliable thread engagement with Class 3A fit and coarse UNC threading, providing consistent fastening and vibration resistance.
- Seamless flush mounting thanks to the 82° countersink angle and standard flat head profile, ideal for sleek industrial designs.
- Corrosion-resistant protection from the black-oxide finish, extending service life in various conditions.
- Full-threaded design for maximum grip along the entire 1-1/8" length, enhancing load distribution.
- Compliance with industry standards including ASTM F835, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 1/2"-13 UNC flat head screw is engineered from black-oxide alloy steel to address critical industrial challenges, such as high-stress assembly and corrosion in harsh settings. The fully threaded coarse design and Class 3A thread fit minimize loosening under vibration, making it ideal for machinery, automotive, and structural applications. Its hex drive enables efficient torque application, reducing installation time and improving reliability. By combining high tensile strength and standardized dimensions, it solves common fastener failures, ensuring consistent performance in heavy-duty fastening scenarios while meeting rigorous environmental regulations.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including UNC coarse threads with a Class 3A fit for tight tolerances and optimal thread engagement. It meets ASTM F835 specifications for mechanical properties, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.
