S-90044A292 4-40 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 high-stress conditions, reducing the risk of fastener failure.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
• Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies.
• Partially threaded design allows for precise clamping force control and easier alignment in specific applications.
• Hex socket drive (3/32") enables high-torque installation with standard tools, minimizing stripping and improving efficiency.
• Coarse UNC threads facilitate quick assembly and disassembly, saving time in maintenance and production cycles.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.

Professional Applications & Engineering Value

This 4-40 UNC Socket Head Cap Screw is engineered to address critical challenges in precision machinery, automotive, and aerospace assemblies. The black-oxide alloy steel construction combats rust and wear, while the Rockwell C37 hardness maintains structural integrity under repetitive loads. Its partially threaded rod and coarse thread design prevent loosening from vibrations, making it ideal for motor mounts, enclosures, and equipment requiring reliable fastening. The hex drive ensures easy access in confined spaces, streamlining installation in complex industrial setups without compromising on 170,000 psi tensile strength.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for high precision, with UNC coarse threads and a right-hand direction. It meets ASTM A574 specifications for alloy steel socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are upheld.