S-91251A635 3/8"-16 x 2 3/4" 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.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding applications.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
• Partially threaded design allows for precise clamping force control, ideal for applications requiring specific unthreaded shank sections.
• Hex socket drive enables high-torque installation with standard hex keys, minimizing stripping and ensuring efficient assembly.
• Rockwell C37 hardness delivers excellent wear resistance and durability, maintaining integrity in repetitive or high-load environments.
• Coarse UNC threads facilitate quicker installation and better performance in materials prone to debris or corrosion.

Professional Applications & Engineering Value

This 3/8"-16 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial and mechanical assemblies where reliability and strength are paramount. The black-oxide alloy steel construction combats corrosion and wear, making it suitable for harsh environments like automotive, machinery, and construction. The partially threaded rod design ensures optimal grip and alignment in fastened joints, reducing stress concentration. With a coarse thread and right-hand direction, it provides rapid installation and robust holding power, even in vibration-prone settings. Compliant with ASTM A574, this fastener meets rigorous standards for high-strength applications, delivering consistent performance and reducing maintenance needs in industrial screw systems.

Specification Summary & Compliance

This socket head cap screw features precise Class 3A thread fit per UNC standards, ensuring tight tolerances and reliable engagement. Dimensions include a 2 3/4" length, 3/8"-16 thread size, and 5/16" hex drive. It conforms to ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.