S-91251A988 7/16"-20 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 in high-stress industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh environments.
• Partially threaded design with fine UNF threads allows for precise clamping force control and improved load distribution in connected components.
• 3/8" hex drive and standard socket head facilitate easy installation and removal with common tools, minimizing assembly time and labor costs.
• Rockwell C37 hardness ensures high wear resistance and maintains structural integrity under repeated use and heavy loads.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations, supporting sustainable procurement.

Professional Applications & Engineering Value

This 7/16-20 UNF Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. Crafted from black-oxide alloy steel, it combines high tensile strength with excellent corrosion resistance, making it ideal for demanding sectors like heavy machinery, automotive assembly, and aerospace. The fine thread and Class 3A fit ensure secure fastening in precision equipment, reducing maintenance needs and downtime. Its partially threaded configuration allows for optimal stress distribution, preventing joint failure in dynamic applications. By integrating robust materials and strict manufacturing standards, this fastener delivers reliable performance in high-load environments, enhancing operational efficiency and safety.

Specification Summary & Compliance

This product features a Class 3A thread fit with precise dimensional accuracy, adhering to UNF fine thread standards. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent quality and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting safe and sustainable industrial use.