S-91309A628 3/8"-16 x 1 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws
Low-Strength Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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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 optimal assembly tolerance for smooth installation and consistent performance
- External hex drive design enables quick, secure tightening with standard tools, reducing installation time
- Fully threaded construction maximizes grip strength and load distribution across the entire fastener length
- Coarse UNC threading facilitates faster assembly and reduces cross-threading risks in production environments
Professional Applications & Engineering Value
This 3/8"-16 UNC hex head screw delivers exceptional engineering value for industrial fastening applications where reliability and compliance are critical. The combination of steel construction with zinc plating provides robust protection against corrosion in manufacturing facilities, machinery assembly, and structural applications. The external hex drive and coarse UNC threading enable rapid installation while maintaining precise alignment, significantly reducing assembly time in high-volume production settings. With full threading and Class 2A fit, these screws ensure consistent clamping force distribution, making them ideal for equipment manufacturing, structural steel connections, and heavy machinery where vibration resistance and long-term performance are essential requirements.
Specification Summary & Compliance
This hex head screw features precision 3/8"-16 UNC coarse threads with Class 2A thread fit according to inch system standards. Manufactured to meet ASME B18.2.1 specifications with material compliance to ASTM A307. 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 and international markets.
