S-91309A638 3/8"-16 x 3 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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 heavy loads and vibration
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- Class 2A thread fit offers consistent, reliable assembly with standard nuts and tapped holes
- External hex drive design allows for high-torque installation using common wrenches
- Fully threaded construction maximizes grip length and load distribution across the entire fastener
- Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interchangeability
Professional Applications & Engineering Value
This 3/8"-16 UNC hex head screw delivers exceptional engineering value for heavy-duty industrial applications where reliability is paramount. The high-strength steel construction combined with zinc plating provides robust protection against corrosion in manufacturing, construction, and machinery assembly environments. The coarse UNC thread design ensures quick installation and superior resistance to vibration loosening, while the external hex drive accommodates high torque requirements without stripping. With its fully threaded configuration and Class 2A fit, this fastener maintains consistent clamping force across structural connections, making it ideal for critical joints in equipment frames, structural steel, and heavy machinery where 60,000 psi tensile strength is essential for long-term performance.
Specification Summary & Compliance
This hex head screw features 3/8"-16 UNC coarse threads with Class 2A thread fit for standard industrial applications. Manufacturing complies with ASME B18.2.1 dimensional specifications and ASTM A307 material standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
