S-91255A013 1-64 x 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating that protects against rust in demanding industrial environments
• Superior torque transmission through 0.050" hex drive design, preventing stripping and ensuring secure fastening
• Maximum thread engagement reliability with Class 3A thread fit, maintaining precise tolerances for vibration-resistant assemblies
• High-strength performance delivering 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Optimized installation efficiency with fully threaded design and coarse thread spacing for faster assembly times
• Low-profile rounded head design providing smooth finished appearance while minimizing protrusion in confined spaces
• Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These black-oxide alloy steel screws with 1-64 UNC coarse threading deliver critical performance advantages in industrial fastening scenarios where vibration resistance and corrosion protection are paramount. The rounded button head profile combined with hex drive functionality enables precise installation in tight spaces while maintaining aesthetic appeal. Engineered with Class 3A thread fit and fully threaded design, these fasteners prevent loosening under dynamic loads, making them ideal for machinery, electronic enclosures, and automotive assemblies where reliability cannot be compromised. The 120,000 psi tensile strength ensures structural integrity in high-stress applications, while the protective black-oxide surface treatment extends service life in challenging environmental conditions.

Specification Summary & Compliance

Manufactured to precise Class 3A thread fit standards with 1-64 UNC coarse thread specifications ensuring dimensional accuracy and interchangeability. Compliant with ASME B18.3 dimensional requirements and ASTM F835 mechanical properties. Meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. The right-hand threaded configuration with fully threaded design maintains consistent engagement across the entire 1/4" length for reliable performance in industrial fastening applications.