S-91306A252 3-48 x 3/8" ASTM F835 Steel Button Head Hex-Drive 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 mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness to withstand high-stress applications
• Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance in critical assemblies
• Optimized drive performance featuring 1/16" hex drive for secure tool engagement and reduced cam-out risk
• Space-efficient design with rounded button head profile providing low-clearance installation without compromising strength
• Full-thread coverage along the 3/8" length for maximum grip and load distribution across the entire fastener
• Regulatory compliance meeting ASME B18.3 and ASTM F835 standards for quality assurance in professional applications

Professional Applications & Engineering Value

These 3-48 UNC zinc-plated alloy steel rounded head screws deliver critical performance advantages in precision engineering applications. The coarse thread spacing and Class 3A thread fit provide superior resistance to vibration loosening in machinery, electronic enclosures, and automotive assemblies. The zinc plating creates a sacrificial barrier against corrosion while maintaining electrical conductivity. With fully threaded design and right-hand thread direction, these button head screws ensure maximum thread engagement in thin materials and blind holes. The combination of 120,000 psi tensile strength and Rockwell C39 hardness makes them ideal for high-stress applications where fastener failure is not an option, from precision instruments to heavy equipment maintenance.

Specification Summary & Compliance

Manufactured to precision Class 3A thread fit with UNC coarse thread specifications (3-48 thread size, 0.099" diameter). Complies with ASME B18.3 dimensional standards and ASTM F835 mechanical properties. Meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations for chemical safety. Features 0.188" head diameter with standard rounded head profile and 1/16" hex drive configuration for consistent performance across industrial applications.