S-91440A257 10-24 x 4" ASME B18.6.3 Steel Round Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Enhanced driving versatility with dual Phillips/Slotted No. 2 drive options for flexible installation tool selection
• Maximum thread engagement through fully threaded design ensuring superior holding power across the entire 4" length
• Reliable mechanical performance with 60,000 psi tensile strength and Rockwell B70 hardness for high-stress applications
• Optimized thread compatibility featuring 10-24 UNC coarse threads with Class 2A fit for secure fastening in various materials
• Streamlined procurement compliance meeting ASME B18.6.3 specifications and environmental regulations (RoHS 3 & REACH)
• Improved installation efficiency with rounded head profile providing smooth surface transition and reduced snagging

Professional Applications & Engineering Value

These zinc-plated steel rounded head screws deliver exceptional engineering value for industrial assembly applications where corrosion resistance and high tensile strength are critical. The 10-24 UNC coarse thread configuration ensures rapid installation and secure fastening in metal, plastic, and composite materials, while the fully threaded design maximizes load distribution across the entire 4" length. The dual Phillips/Slotted drive system provides installation flexibility for various production environments, reducing tooling constraints. With 60,000 psi tensile strength and Rockwell B70 hardness, these fasteners maintain integrity under vibration and dynamic loads, making them ideal for machinery, equipment manufacturing, and structural assemblies where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with 10-24 UNC coarse threads and right-hand threading. Complies with ASME B18.6.3 manufacturing specifications for dimensional accuracy and performance. Meets environmental compliance standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements. Features standard rounded head profile with 0.359" head diameter and 0.137" head height for consistent installation performance.