S-91253A124 5-40 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
- Exceptional durability with Black-Oxide Alloy Steel construction, providing superior corrosion resistance and longevity in harsh industrial environments.
- Precise Class 3A thread fit ensures tight, reliable fastening with minimal risk of loosening, ideal for high-vibration applications.
- High tensile strength of 130,000 PSI delivers robust performance under heavy loads, reducing the need for frequent replacements.
- 82° countersink angle and flat head design allows for a flush, secure fit that minimizes protrusion and enhances aesthetic appeal.
- Fully threaded body offers consistent grip along the entire length, improving load distribution and assembly efficiency.
- Hex drive (5/64") compatibility enables easy installation and removal with standard tools, speeding up maintenance and repairs.
- Rockwell C39 hardness provides excellent wear resistance, maintaining thread integrity over repeated use.
Professional Applications & Engineering Value
This 5-40 UNC flat head screw is engineered from Black-Oxide Alloy Steel to address common industrial challenges, such as corrosion and mechanical stress. Its Class 3A thread fit and coarse thread spacing ensure quick, secure fastening in materials like metal and plastic, reducing assembly time and improving reliability. The fully threaded design and 82° countersink angle provide a low-profile, stable connection that prevents snagging and distributes loads evenly. Ideal for precision applications in machinery, electronics, and automotive sectors, it combines high tensile strength and hardness to withstand demanding conditions without compromising performance.
Specification Summary & Compliance
This screw adheres to Class 3A thread tolerances for precise fit, with UNC coarse threads and right-hand threading for standard applications. It meets ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. 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.
