S-90357A117 4-40 x 1/2" Alloy Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance with Black-Oxide coating on Alloy Steel, ideal for harsh industrial environments.
• Precise, Reliable Fastening ensured by Class 3A thread fit, minimizing loosening and vibration failure.
• High Tensile Strength of 140,000 psi provides superior load-bearing capacity for demanding applications.
• Compact, Space-Saving Design with an ultra-low socket head profile, perfect for tight assemblies.
• Consistent Dimensional Accuracy with a length tolerance of ±0.005", ensuring uniform installation and performance.
• Optimized for Quick Installation using a 1/16" hex drive, reducing assembly time and effort.
• Compliance with Environmental Standards including RoHS 3 and REACH, meeting global regulatory requirements.

Professional Applications & Engineering Value

These 4-40 UNC Socket Head Cap Screws are engineered to address critical fastening challenges in precision industries. The Black-Oxide Alloy Steel construction offers excellent wear and corrosion resistance, extending service life in machinery, electronics, and automotive assemblies. The ultra-low profile head and coarse UNC threads facilitate secure fastening in confined spaces, while the Class 3A thread fit ensures minimal backlash and reliable performance under dynamic loads. With a Rockwell C32 hardness and high tensile strength, these screws withstand extreme stresses, making them ideal for high-performance applications where failure is not an option.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 3A precision fit, right-hand thread direction, and a length of 1/2" with a tolerance of -0.005" to 0.005". Manufactured from Alloy Steel with Black-Oxide finish, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory adherence for industrial use.