S-91253A077 2-56 x 1/4" 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
- Superior corrosion resistance with black-oxide coating on alloy steel, ideal for harsh industrial environments.
- Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress applications.
- Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal risk of loosening.
- Fully threaded coarse UNC spacing allows for quick installation and strong holding power in various materials.
- 82° countersink angle and flat head design enables flush mounting, reducing snagging and improving aesthetics.
- Hex drive (0.050") compatibility offers easy torque application with standard tools, speeding up assembly.
- High hardness (Rockwell C39) enhances durability and wear resistance for long-term use in demanding settings.
Professional Applications & Engineering Value
This 2-56 UNC flat head screw is engineered to address common industrial challenges, such as corrosion and mechanical failure. Made from black-oxide alloy steel, it provides excellent protection against rust and wear, making it suitable for automotive, machinery, and electronics assemblies where environmental factors are a concern. The coarse thread spacing and Class 3A thread fit ensure quick, secure fastening in materials like metal and plastic, reducing installation time and improving reliability. Its fully threaded design and 82° countersink angle allow for a smooth, flush finish, minimizing protrusions in tight spaces. Ideal for applications requiring high tensile strength and compliance with industry standards, this screw delivers consistent performance in rigorous B2B environments.
Specification Summary & Compliance
This product adheres to precise dimensional tolerances, including Class 3A thread fit for superior accuracy and UNC coarse thread standards. It meets key manufacturing specifications such as ASME B18.3 and ASTM F835, ensuring consistent quality and interoperability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, supporting safe and sustainable industrial use.
