S-91255A081 2-56 x 1/2" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional corrosion resistance with black-oxide coating for prolonged service life in harsh industrial environments
- Superior torque transmission through precision hex drive design, minimizing tool slippage during installation
- Reliable thread engagement with Class 3A fit ensuring consistent fastening performance in critical assemblies
- High mechanical strength with 120,000 psi tensile rating and Rockwell C39 hardness for demanding applications
- Optimized installation efficiency through fully threaded design and coarse UNC thread spacing
- Enhanced clearance profile with rounded button head design reducing snagging in confined spaces
- Regulatory compliance assurance meeting international standards for quality and environmental safety
Professional Applications & Engineering Value
Engineered for precision assemblies requiring reliable fastening under high stress conditions, these black-oxide alloy steel screws deliver exceptional performance in industrial machinery, electronic enclosures, and automotive components. The Class 3A thread fit maintains dimensional stability in vibration-prone environments, while the fully threaded UNC coarse spacing accelerates installation in production lines. The rounded head profile with hex drive provides optimal torque transfer without compromising the low-profile design requirements of modern equipment. Black-oxide surface treatment offers superior protection against oxidation, making these 2-56 UNC screws ideal for applications where corrosion resistance and mechanical reliability are paramount.
Specification Summary & Compliance
Manufactured to precision Class 3A thread tolerances with UNC coarse thread spacing and right-hand threading. Compliant with ASME B18.3 dimensional specifications and ASTM F835 mechanical requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 0.050" hex drive and standard rounded button head profile per industrial specifications.
