S-91263A220 1/2"-13 x 5" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh industrial environments
• Exceptional holding power with Class 3A thread fit ensuring precise, vibration-resistant connections in critical applications
• High-strength performance delivering 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty load requirements
• Optimized installation efficiency with 5/16" hex drive providing secure tool engagement and reduced slippage
• Reliable flush mounting through standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced thread engagement control with partial threading allowing precise clamping force distribution
• Industry-standard compatibility with UNC coarse threads ensuring broad interchangeability across equipment and components

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these zinc-plated alloy steel flat head screws provide critical solutions for machinery assembly, structural frameworks, and heavy equipment manufacturing. The 1/2"-13 UNC coarse thread configuration delivers superior pull-out resistance in soft materials and faster installation in production environments. With Class 3A thread fit precision and 130,000 psi tensile strength, these fasteners prevent joint failure in high-vibration settings while the 82° countersink angle ensures flush mounting without surface protrusions. The zinc plating offers essential corrosion protection for outdoor equipment and industrial facilities where moisture and chemicals are present, making these flat head screws ideal for construction, automotive, and manufacturing applications requiring reliable, long-lasting fastening solutions.

Specification Summary & Compliance

This 5" length flat head screw features precision Class 3A thread fit with 1/2"-13 UNC coarse threads and right-hand threading direction. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making these screws suitable for global industrial applications requiring strict regulatory adherence.