S-90357A013 1/4"-20 x 1/2" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 140,000 psi tensile strength and Rockwell C32 hardness for reliable performance in high-stress applications
• Precision thread engagement with Class 3A fit ensures tight, secure fastening and vibration resistance in critical assemblies
• Ultra-low profile design provides maximum clearance in space-constrained applications while maintaining full socket engagement
• Superior corrosion protection through black-oxide coating on alloy steel for extended service life in demanding environments
• Optimized drive performance with 1/8" hex drive socket for secure tool engagement and reduced cam-out during installation
• Full thread coverage along the entire 1/2" length delivers maximum holding power and load distribution
• Industry-standard compatibility with 1/4"-20 UNC coarse threads for easy integration with existing equipment and components

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws are engineered to solve critical fastening challenges in industrial applications where space limitations and high strength requirements coexist. The ultra-low profile head design allows installation in tight clearances while maintaining full hex drive engagement for proper torque application. The Class 3A thread fit ensures precise mating with corresponding threaded components, eliminating play and reducing vibration-induced loosening in machinery, automation systems, and precision equipment. The combination of 140,000 psi tensile strength and coarse UNC threads provides exceptional clamping force and resistance to dynamic loads, making these screws ideal for critical assemblies in manufacturing equipment, automotive components, and heavy machinery where reliability is paramount.

Specification Summary & Compliance

This socket head cap screw features precise dimensional control with 1/4"-20 UNC coarse threads manufactured to Class 3A fit standards, ensuring tight tolerances and reliable performance. The length tolerance is maintained at -0.005" to 0.005" for consistent installation characteristics. Manufacturing complies with industry standards for inch system fasteners and meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring suitability for global industrial applications and environmental responsibility.