S-91263A119 2-56 x 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive Flat Head 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, extending service life in harsh industrial environments
- Exceptional holding power with 130,000 psi tensile strength and Rockwell C39 hardness for reliable fastening in high-stress applications
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant connections
- Streamlined installation with hex drive (0.050") design providing superior torque transmission and reduced cam-out risk
- Flush mounting capability with standard 82° countersink angle and flat head profile for clean, unobtrusive finishes
- Full-thread coverage along the 1/4" length maximizes grip strength and distributes load evenly
- Regulatory compliance meeting ASTM F835, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
These 2-56 UNC flat head screws deliver critical engineering advantages where space constraints and material integrity are paramount. The zinc-plated alloy steel construction provides essential corrosion protection for electronics, machinery, and outdoor equipment, while the Class 3A thread fit ensures precise, repeatable assembly in automated manufacturing. The 82° countersink angle and flat head design allow seamless integration into precision components without protrusion, making them ideal for aerospace, automotive, and industrial control systems where vibration resistance and flush surfaces are mandatory. The hex drive configuration prevents stripping during high-torque installation, reducing assembly time and maintenance costs in high-volume production environments.
Specification Summary & Compliance
Manufactured to inch system specifications with UNC coarse threads and Class 3A precision tolerance for consistent performance. Fully compliant with ASTM F835 manufacturing standards, RoHS 3 (2015/863/EU) hazardous substance restrictions, and REACH (EC 1907/2006) chemical safety regulations. Right-hand threaded with standard flat head profile and fully threaded 1/4" length for uniform load distribution.
