S-90128A637 3/8"-16 x 3 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 in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
• Precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies with minimal play.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Hex socket drive design allows for high-torque installation in confined spaces, improving assembly efficiency.
• Coarse UNC threads enable quicker installation and better performance in materials prone to stripping or cross-threading.
• Partial threading provides an unthreaded shoulder for precise clamping and alignment in machined components.

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, this socket head cap screw combines zinc-plated alloy steel construction with Class 3A UNC threads to address critical assembly challenges. The coarse thread pitch ensures rapid installation in soft materials and castings where fine threads might strip, while the partially threaded shank provides superior shear resistance and precise component positioning. Ideal for machinery, automotive, and heavy equipment applications, these screws deliver high tensile strength and corrosion resistance where vibration integrity and environmental durability are paramount. The hex socket drive accommodates high torque values without cam-out, making them perfect for space-constrained assemblies requiring reliable, maintenance-free performance.

Specification Summary & Compliance

This socket head cap screw features 3/8"-16 UNC coarse threads with Class 3A fit for precision threading applications. Manufactured to ASTM A574 specification for high-strength alloy steel socket head cap screws, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety. The screw maintains dimensional accuracy with 1-1/2" minimum thread length and 3-1/2" overall length, ensuring consistent performance in industrial fastener applications.