S-91255A113 4-40 x 3/4" 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
- Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments.
- Exceptional tensile strength (120,000 psi) ensures reliable, high-load fastening without failure.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections in critical assemblies.
- Hex drive (1/16") design allows for easy installation and high-torque application with standard tools.
- Fully threaded 4-40 UNC coarse thread provides maximum grip and holding power across the entire 3/4" length.
- Hardened alloy steel (Rockwell C39) offers excellent durability and wear resistance for long-term performance.
- Compliance with ASME B18.3 and ASTM F835 ensures consistent quality and interchangeability in professional applications.
Professional Applications & Engineering Value
Engineered for demanding environments, these 4-40 UNC coarse thread rounded head screws address common industrial challenges such as vibration loosening and material fatigue. The black-oxide alloy steel construction provides a robust barrier against oxidation and chemical exposure, making them ideal for machinery, automotive, and electronic enclosures where corrosion resistance is critical. The fully threaded design and Class 3A thread fit ensure uniform stress distribution and secure fastening in high-vibration settings, reducing maintenance needs. With a hex drive for efficient installation, these screws deliver reliable performance in assembly lines and precision equipment, meeting rigorous ASME B18.3 and ASTM F835 standards for consistency and safety.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for precise tolerances and UNC coarse threading per standardized dimensions. It complies with ASME B18.3 and ASTM F835 manufacturing specifications, ensuring dimensional accuracy and performance reliability. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe industrial use.
