S-90044A198 3/4"-16 x 9" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal backlash.
• Deep hex socket drive (5/8") allows for high torque application and easy installation in confined spaces with standard tools.
• Partially threaded design offers optimal grip and clamping force where full threading isn't required, enhancing joint stability.
• Fine UNF threading delivers better adjustment control and higher fatigue resistance compared to coarse threads.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties for critical engineering applications.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high tensile loads. The UNF fine thread with Class 3A fit ensures precise engagement in machinery, automotive, and heavy equipment assemblies, reducing maintenance needs. The partially threaded shank concentrates clamping force exactly where needed, preventing joint slippage in dynamic environments. With a Rockwell C37 hardness and robust 1 1/8" head diameter, it withstands repeated torque cycles without stripping, making it ideal for permanent or semi-permanent fixtures in construction, manufacturing, and aerospace sectors where reliability is non-negotiable.

Specification Summary & Compliance

This screw maintains Class 3A thread fit per UNF standards, with a fine thread spacing and 2" minimum thread length. It is manufactured in accordance with ASTM A574 specifications, ensuring dimensional accuracy and mechanical consistency. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use worldwide.