S-91251A919 3/8"-16 x 12" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precise Class 3A thread fit allows for smoother assembly and superior clamping force, minimizing the chance of cross-threading and improving joint integrity.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending service life in harsh industrial environments without compromising on durability.
• Partially threaded design offers optimal grip and alignment in assemblies, making it ideal for applications where unthreaded shank strength is critical.
• 5/16" hex drive socket head enables easy installation with standard tools, facilitating quick maintenance and reducing assembly time in tight spaces.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to rigorous quality and environmental standards, providing peace of mind for regulated industries.
• Coarse UNC threads deliver faster installation and better resistance to vibration loosening compared to fine threads, enhancing operational reliability.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in heavy machinery, automotive assemblies, and structural frameworks. The 3/8"-16 UNC coarse thread and Class 3A fit provide superior engagement in materials like steel and cast iron, reducing the need for frequent retightening. Its partially threaded rod type ensures that the unthreaded portion bears shear loads effectively, while the Rockwell C37 hardness and high tensile strength prevent stripping under torque. Ideal for industrial screws applications requiring robust fastening solutions, this screw maintains performance in environments exposed to moisture and mechanical stress, supported by its compliant standards for safety and longevity.

Specification Summary & Compliance

This screw features a 3/8"-16 UNC coarse thread with Class 3A thread fit for high precision, a length of 12 inches, and a partially threaded design. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent quality and performance. Additionally, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and health safety standards for industrial use.