S-91253A123 5-40 x 3/16" 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
- Enhanced corrosion resistance with Black-Oxide coating, ideal for industrial environments requiring durability and minimal maintenance.
- Superior tensile strength of 130,000 psi ensures reliable performance under high-stress applications, reducing failure risks.
- Precise Class 3A thread fit provides tight, secure fastening with minimal play, improving assembly accuracy and vibration resistance.
- 82° countersink angle allows for flush mounting in standard recesses, delivering a clean, professional finish.
- Fully threaded design maximizes grip and load distribution along the entire length, enhancing joint stability.
- Hex drive (5/64") enables easy installation with standard tools, reducing assembly time and effort.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards for safety and environmental responsibility.
Professional Applications & Engineering Value
These 5-40 UNC flat head screws are engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding environments. Made from Black-Oxide Alloy Steel, they offer excellent hardness (Rockwell C39) and tensile strength, making them suitable for machinery, automotive assemblies, and electronic enclosures where Class 3A thread fit ensures precise, reliable connections. The coarse thread spacing and fully threaded design enhance grip in various materials, while the 82° countersink angle provides a seamless fit, reducing protrusion risks. Ideal for applications requiring right-hand threading and hex drive efficiency, these screws deliver long-term performance in harsh conditions, minimizing maintenance and downtime.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A thread fit for high precision and tight tolerances. It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in industrial use.
