S-91255A125 5-40 x 1/2" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive 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 120,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies and minimized loosening.
- Hex drive design (5/64") allows for easy installation and removal with standard tools, improving assembly efficiency.
- Fully threaded right-hand UNC coarse thread enables quick engagement and strong holding power in various materials.
- Rounded button head profile offers a low-profile, aesthetically clean finish while reducing snagging risks.
- Compliance with ASME B18.3, ASTM F835, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe, global use.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 5-40 UNC rounded head screws with black-oxide alloy steel construction address common challenges like corrosion and mechanical stress. The coarse thread design ensures rapid installation in metals and plastics, while the hex drive provides torque resistance for secure fastening in machinery, electronics, and automotive assemblies. With a Rockwell C39 hardness and high tensile strength, they resist wear and deformation, making them ideal for high-vibration environments. The fully threaded configuration maximizes grip length, enhancing load distribution and joint integrity in critical engineering projects.
Specification Summary & Compliance
This screw features a 5-40 UNC coarse thread with Class 3A fit for precise dimensional accuracy, ensuring consistent performance. Manufactured to meet ASME B18.3 and ASTM F835 specifications, it guarantees reliability in industrial use. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental safety and global supply chain requirements.
