S-90044A191 1/2"-20 x 1 1/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: Withstands up to 170,000 psi for reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: Black-oxide coating on alloy steel provides enhanced protection against rust and wear, extending service life in harsh environments.
• Precision Thread Fit: Class 3A UNF fine threads ensure tight, secure fastening with minimal backlash, improving assembly accuracy and vibration resistance.
• High Hardness & Durability: Rockwell C37 hardness offers excellent resistance to deformation and stripping, maintaining integrity under repeated use.
• Efficient Hex Drive Design: 3/8" hex socket drive allows for easy installation and high torque application with standard tools, speeding up assembly processes.
• Full Thread Engagement: Fully threaded design provides consistent clamping force along the entire length, enhancing joint stability in demanding setups.
• Compliance with Industry Standards: Meets ASTM A574, RoHS 3, and REACH regulations, ensuring safety, environmental responsibility, and compatibility in global markets.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial and mechanical assemblies. The 1/2"-20 UNF fine thread with Class 3A fit delivers precise alignment and superior load distribution, minimizing loosening in high-vibration environments like machinery, automotive systems, and heavy equipment. The alloy steel construction, combined with a black-oxide surface treatment, resists corrosion and abrasion, making it ideal for outdoor or chemically exposed settings. Its 170,000 psi tensile strength and Rockwell C37 hardness ensure long-term reliability, reducing maintenance needs and downtime in industrial fastening applications. Fully threaded for maximum grip, it supports robust connections in structural frameworks, ensuring engineering integrity and operational efficiency.

Specification Summary & Compliance

This socket head cap screw features precise Class 3A thread fit per UNF standards, with a 1/2"-20 fine thread and right-hand direction for consistent engagement. Dimensions include a 1-1/8" length, 3/4" head diameter, and 3/8" hex drive for accurate installation. Manufactured in compliance with ASTM A574 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and adherence to global industry standards for reliable performance.