S-91251A118 7/16"-14 x 4 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 under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish protects against rust and extends service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Partially threaded design allows for optimal clamping force on specific sections, enhancing joint stability and ease of installation.
• 3/8" hex drive compatibility offers efficient torque application with standard tools, speeding up assembly and maintenance processes.
• High hardness (Rockwell C37) resists wear and deformation, maintaining structural integrity through repeated use.
• Compliance with ASTM A574 guarantees consistent quality and reliability, meeting rigorous industrial standards for demanding applications.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, automotive systems, and construction equipment. The UNC coarse thread design ensures quick installation and robust holding power, even in materials prone to stripping. With a partially threaded shank, it concentrates clamping force precisely where needed, reducing stress concentrations and preventing joint failure. The high tensile strength and Rockwell C37 hardness provide durability against dynamic loads and abrasion, while the black-oxide surface treatment offers added protection against corrosion, making it ideal for outdoor or humid environments. By meeting ASTM A574 specifications, this fastener delivers consistent performance, minimizing downtime and maintenance costs in engineering applications.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a 7/16"-14 UNC coarse thread profile. It is manufactured in compliance with ASTM A574 for material and mechanical properties, ensuring reliability. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its safety and sustainability for global industrial use.