S-90128A855 5-40 x 3/8" 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 industrial applications.
• Superior corrosion resistance from zinc plating protects against environmental damage, extending service life.
• Precise Class 3A thread fit guarantees secure fastening with minimal risk of loosening under vibration.
• High hardness rating (Rockwell C37) provides excellent wear resistance and durability.
• Coarse UNC threads enable quick installation and removal, reducing assembly time.
• Fully threaded design offers consistent holding power along the entire length for versatile applications.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety.

Professional Applications & Engineering Value

This 5-40 UNC Socket Head Cap Screw is engineered from zinc-plated alloy steel to address critical industrial challenges such as vibration-induced loosening and corrosion in harsh environments. The coarse thread design and Class 3A fit provide superior grip and alignment, making it ideal for machinery, automotive assemblies, and heavy equipment where reliability is paramount. Its fully threaded right-hand configuration ensures uniform stress distribution, reducing the risk of joint failure. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme loads and repetitive use, offering long-term performance in demanding applications like aerospace, construction, and manufacturing.

Specification Summary & Compliance

This screw features a 5-40 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances for secure fastening. Manufactured to ASTM A574 specifications, it guarantees consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial sectors without environmental hazards.