S-91236A611 5/16"-18 x 8" 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 harsh industrial environments
- High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibrations
- Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
- External hex drive design allows for easy installation and removal with standard tools
- Class 2A thread fit offers consistent, precise engagement for secure fastening applications
- Partially threaded shank enables optimal clamping force distribution in assembled components
- Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interchangeability
Professional Applications & Engineering Value
This 5/16"-18 UNC hex head screw is engineered for demanding industrial applications where reliability is critical. The steel construction with zinc plating provides essential corrosion protection in manufacturing, construction, and machinery assembly environments. The coarse UNC thread design ensures rapid installation and superior resistance to vibration loosening, while the 8" length and partial threading make it ideal for applications requiring precise clamp load distribution. With 60,000 PSI tensile strength and Rockwell B69 hardness, this fastener maintains integrity under sustained stress, making it suitable for structural connections, equipment mounting, and heavy-duty framing where failure is not an option.
Specification Summary & Compliance
This hex head screw features 5/16"-18 UNC coarse threads with Class 2A thread fit for consistent dimensional accuracy. Manufactured to ASME B18.2.1 specifications using ASTM A307 grade steel, it ensures reliable performance in industrial fastening applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial components.
