S-90044A224 2 1/4"-4 1/2 x 4" 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, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 2A thread fit with coarse UNC threads enables quick assembly and secure fastening, minimizing installation time and improving operational efficiency.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity and drive engagement through repeated use.
• Full threading along the 4" length offers versatile fastening depth and uniform stress distribution, ideal for adjustable or deep-set applications.
• Large 1 3/4" hex drive allows for high-torque installation with standard tools, ensuring tight, secure connections without stripping.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety, meeting rigorous industrial and regulatory standards.

Professional Applications & Engineering Value

This socket head cap screw is engineered to address critical challenges in heavy machinery, construction, and manufacturing sectors. The black-oxide alloy steel construction combats rust and wear, while the coarse UNC thread design ensures rapid assembly in high-vibration environments, reducing downtime. With a tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands dynamic loads and repetitive stress, making it ideal for structural frames, industrial equipment, and automotive assemblies. The fully threaded rod allows for flexible positioning and even load distribution, solving alignment issues in complex installations. Its compliance with ASTM A574 ensures dimensional accuracy and reliability, supporting efficient maintenance and long-term operational safety.

Specification Summary & Compliance

This screw features a Class 2A thread fit with UNC coarse threads (2 1/4"-4 1/2) and is fully threaded over a 4" length, adhering to precise dimensional tolerances. It meets ASTM A574 specifications for high-strength socket head cap screws, ensuring consistent manufacturing quality. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial use.