S-90128A587 5/16"-18 x 1 1/2" 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, reducing the risk of fastener failure.
• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh environments and minimizing maintenance needs.
• Precise Class 3A thread fit provides tight, secure connections with minimal play, enhancing assembly integrity and vibration resistance.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• Fully threaded right-hand design with UNC coarse threads enables quick installation and maximum grip across the entire fastener length.
• Standard hex drive compatibility with 1/4" drive size allows for easy installation using common tools, improving workflow efficiency.
• Compliance with environmental regulations including RoHS 3 and REACH ensures safe usage in regulated industries and global markets.

Professional Applications & Engineering Value

These zinc-plated alloy steel socket head cap screws deliver critical performance advantages in demanding industrial settings. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes them ideal for heavy machinery, automotive assemblies, and construction equipment where vibration resistance and load-bearing capacity are paramount. The UNC coarse thread configuration prevents cross-threading during high-speed assembly while providing superior holding power. The zinc plating creates a protective barrier against moisture and chemicals, significantly extending service life in corrosive environments. With their fully threaded design and Class 3A thread fit, these screws maintain consistent clamping force across the entire engagement length, solving common issues of joint loosening in dynamic applications.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNC 5/16"-18 thread dimensions. Features include right-hand thread direction, coarse thread spacing, and standard socket head profile with 1/4" hex drive. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across various industrial sectors.