S-91309A621 3/8"-16 x 5/8" ASME B18.2.1, SAE J429 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments.
• High tensile strength of 60,000 psi ensures reliable performance under significant load and stress.
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation.
• External hex drive and hex head design allows for easy installation and high torque application with standard tools.
• Class 2A thread fit and coarse UNC threading offer quick assembly and secure fastening in a wide range of materials.
• Full threading along the 5/8" length maximizes grip and adjustability in various applications.
• Compliance with ASME B18.2.1 and SAE J429 guarantees consistent quality and interchangeability.

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. Constructed from high-grade steel and finished with a protective zinc plating, it resists corrosion in harsh conditions, reducing maintenance needs. The coarse thread and Class 2A fit ensure rapid, secure fastening in assembly lines, machinery, and structural frameworks, minimizing downtime. Its external hex drive facilitates efficient installation with common wrenches, enhancing productivity in automotive, construction, and heavy equipment sectors where reliability is critical.

Specification Summary & Compliance

This screw features precise Class 2A thread fit per UNC standards, with a thread size of 3/8"-16 and full threading over a 5/8" length. It meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. Additionally, it is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations for industrial use.