S-91255A079 2-56 x 3/8" 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 corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Superior torque transmission through precision hex drive design, preventing tool slippage and ensuring secure fastening
- High-reliability thread engagement with Class 3A fit and UNC coarse threads for vibration resistance and quick assembly
- Maximum load-bearing capacity from 120,000 psi tensile strength and Rockwell C39 hardness for critical applications
- Full-threaded design providing consistent clamping force along the entire 3/8" length for uniform stress distribution
- Low-profile rounded head with button style for flush mounting where clearance is limited
- Guaranteed material integrity through compliance with ASME B18.3 and ASTM F835 manufacturing standards
Professional Applications & Engineering Value
These black-oxide alloy steel screws deliver critical performance in precision assemblies where vibration resistance and corrosion protection are paramount. The 2-56 UNC coarse thread configuration ensures rapid installation in electronic enclosures, machinery panels, and automotive components while maintaining Class 3A thread fit precision. The hex drive design provides superior torque transmission compared to Phillips or slotted drives, reducing installation time and preventing fastener damage in high-volume production environments. The combination of 120,000 psi tensile strength and fully threaded construction makes these rounded head screws ideal for applications requiring consistent clamping force across the entire engagement length.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNC coarse thread profile (2-56 size). Fully compliant with ASME B18.3 dimensional specifications and ASTM F835 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features right-hand thread direction with 0.050" hex drive size and standard rounded head profile.
