S-90128A985 1"-8 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments.
• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress loads.
• Precise Class 3A thread fit guarantees secure, vibration-resistant fastening in critical assemblies.
• Robust Rockwell C37 hardness provides excellent wear resistance and durability.
• High-torque 3/4" hex drive allows for easy installation and removal with standard tools.
• Coarse 1"-8 UNC threads enable quick assembly and superior holding power.
• Partially threaded design offers versatile clamping force control for various applications.

Professional Applications & Engineering Value

This zinc-plated alloy steel socket head cap screw is engineered for demanding industrial applications where failure is not an option. Its high tensile strength and Class 3A thread fit provide a secure, precision fastening solution that resists loosening under vibration and dynamic loads, common in heavy machinery, automotive assemblies, and construction equipment. The coarse UNC thread facilitates rapid installation, reducing assembly time in production lines, while the zinc plating offers a protective barrier against corrosion, ensuring long-term reliability in outdoor or chemically aggressive environments. The combination of a 3/4" hex drive and partially threaded shank delivers optimal torque transmission and controlled clamping, making it an indispensable industrial fastener for engineers prioritizing safety and performance.

Specification Summary & Compliance

This socket head cap screw adheres to Class 3A thread tolerances for precision fit and is manufactured in accordance with ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it meets global standards for restricted substances and industrial safety.