S-91306A249 2-56 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
- Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh environments
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for reliable load-bearing performance
- Precision thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance
- Easy installation and removal with 0.050" hex drive design providing positive torque transmission
- Versatile rounded button head profile offering a low-profile, finished appearance while reducing surface snagging
- Full threading along 1/2" length for maximum grip range and adjustment flexibility in assemblies
- Industry compliance assurance meeting ASME B18.3 and ASTM F835 specifications for consistent quality
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 2-56 UNC rounded head screws provide critical solutions where space constraints and vibration resistance are paramount. The zinc-plated alloy steel construction delivers excellent corrosion protection in electronic enclosures, machinery panels, and automotive assemblies. With Class 3A thread fit and coarse UNC threading, these fasteners maintain secure connections in high-vibration environments while the hex drive design ensures reliable torque application during installation. The rounded button head profile minimizes protrusion risks in compact spaces while providing a professional finish. These characteristics make them ideal for precision equipment, aerospace components, and industrial machinery where 120,000 psi tensile strength and consistent performance are non-negotiable requirements.
Specification Summary & Compliance
This 2-56 UNC screw features precision Class 3A thread fit with coarse thread spacing and right-hand threading. Manufactured to ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting current industry standards for hazardous substance restrictions.
