S-91263A566 1/4"-20 x 2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-plated alloy steel construction for extended service life in demanding environments
• Superior load-bearing capacity with 130,000 psi tensile strength to withstand high-stress applications
• Precision thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening
• Optimized drive efficiency with 5/32" hex drive providing secure tool engagement and reduced cam-out
• Enhanced material durability with Rockwell C39 hardness maintaining structural integrity under repeated use
• Versatile partial threading allowing precise clamping force control across various material thicknesses
• Regulatory compliance assurance meeting ASTM F835 specifications while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws deliver critical performance advantages for industrial assembly applications where vibration resistance and corrosion protection are paramount. The zinc-plated alloy steel construction provides superior environmental protection while maintaining the 130,000 psi tensile strength necessary for heavy-duty fastening. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of loosening in dynamic applications. The 82° countersink angle and flat head design create flush surface finishes ideal for machinery, equipment manufacturing, and structural assemblies where protruding fasteners are unacceptable. These partially threaded screws offer optimal clamping force distribution, making them particularly valuable in applications requiring precise tension control across multiple material layers.

Specification Summary & Compliance

These industrial-grade fasteners feature 1/4"-20 UNC coarse threads with Class 3A thread fit precision and 2" overall length with 1 1/4" minimum thread length. Manufacturing complies with ASTM F835 specifications for consistent quality and performance. The screws maintain full compliance with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations, ensuring they meet current international environmental and safety standards for industrial applications.