S-94414A361 1/4"-20 x 1/2" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP30 drive for reduced cam-out and increased tool life
• Exceptional durability from black-oxide alloy steel offering corrosion resistance and long service life
• High-load capacity with 140,000 psi tensile strength and Rockwell C39 hardness for demanding applications
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring reliable fastening
• Flush installation with standard 82° countersink angle flat head for smooth surface finishes
• Full-threaded design providing maximum grip length and uniform stress distribution
• Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws with Torx Plus drive address critical industrial fastening challenges where vibration resistance, high torque requirements, and surface finish integrity are paramount. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 140,000 psi tensile strength needed for structural applications. The Class 3A thread fit ensures precise engagement in machinery, automotive assemblies, and heavy equipment where coarse thread spacing facilitates quicker installation and superior performance in high-vibration environments. The combination of fully threaded design and standardized 82° countersink angle makes these fasteners ideal for applications requiring flush mounting in metal fabrication, industrial machinery, and precision equipment manufacturing.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNC coarse thread standards. These flat head screws comply with ASTM F835 manufacturing requirements and maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurement ensures compatibility with North American industrial standards while the right-hand thread direction and fully threaded configuration provide consistent performance across industrial applications.