S-91251A436 3/8"-24 x 3" 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.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance, extending service life in harsh industrial environments without compromising structural integrity.
• Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• Fine UNF threads deliver improved clamping force and better load distribution, ideal for applications requiring fine adjustments and high fatigue resistance.
• Partially threaded design with 1-1/4" min thread length allows for optimal grip and alignment, simplifying installation in confined spaces while maintaining strength.
• 5/16" hex drive socket head enables easy installation and removal with standard tools, reducing assembly time and improving workflow efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to international quality and environmental standards, supporting sustainable and safe industrial operations.

Professional Applications & Engineering Value

These 3/8"-24 UNF socket head cap screws are engineered to address common industrial challenges such as vibration loosening, corrosion, and high-load demands. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, provides excellent durability and resistance to wear, making them suitable for heavy-duty machinery, automotive assemblies, and precision equipment. The fine thread design enhances grip in materials prone to stress cracking, while the partially threaded configuration ensures secure fastening without over-torquing. Ideal for applications requiring Class 3A thread fit, these screws offer reliable performance in aerospace, manufacturing, and construction sectors, where corrosion resistance and long-term reliability are critical.

Specification Summary & Compliance

This product features precise Class 3A thread fit with UNF fine threads and a 3" length including a minimum thread engagement of 1-1/4". Manufactured to ASTM A574 specifications, it ensures consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it meets stringent environmental and safety standards for industrial use.