S-91268A390 3/8"-16 x 4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear in demanding industrial environments.
• Fully threaded design offers maximum grip and load distribution, ideal for applications requiring consistent clamping force.
• Coarse UNC thread with Class 2A fit enables quick assembly and easy installation while maintaining precise thread engagement.
• External hex drive and hex head allow for high-torque application with standard tools, improving installation efficiency.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for professional use.
• RoHS 3 and REACH compliant ensures environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery assembly, and structural frameworks where vibration resistance and high tensile loads are paramount. The fully threaded 3/8"-16 UNC coarse thread design ensures rapid installation and robust holding power, minimizing loosening under dynamic stresses. Made from high-strength steel with Rockwell C33 hardness, it withstands extreme conditions without compromising integrity, while the external hex drive facilitates efficient torque application with common tools. Ideal for securing heavy equipment, automotive components, and structural elements, this fastener delivers reliable performance that reduces maintenance needs and enhances operational safety in demanding environments.

Specification Summary & Compliance

This 4" length hex head screw features a 3/8"-16 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It meets ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and usage in industrial markets.