S-90044A225 2 1/4"-4 1/2 x 6" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads and prevents fastener failure in critical applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• High torque capability with a 1 3/4" hex drive and standard socket head profile, allowing for secure installation and removal with standard tools.
• Optimized thread engagement with coarse UNC threads and Class 2A fit, providing quick assembly and reliable holding power in coarse materials.
• Enhanced durability from Rockwell C37 hardness, resisting wear and deformation during repeated use.
• Versatile partial threading design offers a non-threaded shank for precise alignment and shear resistance where needed.
• Broad industrial compliance with ASTM A574, RoHS 3, and REACH standards, ensuring material quality and environmental safety.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as high-stress loosening and corrosion in heavy machinery, construction equipment, and large-scale structural assemblies. The coarse UNC thread (2 1/4"-4 1/2) and Class 2A thread fit ensure rapid installation and robust clamping force, reducing assembly time while maintaining integrity under vibration. The partially threaded rod design provides an unthreaded section that enhances shear strength and alignment in bolted joints, making it ideal for applications requiring precise component positioning. With a 1 3/4" hex drive, it accommodates high torque inputs without stripping, supporting maintenance and manufacturing efficiency in sectors like automotive, aerospace, and industrial machinery where reliability is non-negotiable.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNC coarse threads (2 1/4"-4 1/2) with a minimum thread length of 5 5/8" on a 6" overall length. Manufactured in accordance with ASTM A574 specifications for high-strength alloy steel, it ensures material consistency and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industries without hazardous substances.