S-91309A597 5/16"-18 x 3 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 that protects against rust and extends service life in demanding environments
- High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and prevents fastener failure
- Easy installation and removal with external hex drive design that provides secure tool engagement and reduces assembly time
- Precise thread fit (Class 2A) offers consistent engagement and reduces the risk of cross-threading during installation
- Full threading along the 3 1/2" length allows for maximum adjustability and secure fastening in various material thicknesses
- Compliance with ASME B18.2.1 and ASTM A307 standards guarantees consistent quality, dimensional accuracy, and material reliability
- Rockwell B69 hardness provides excellent durability and resistance to wear in high-stress industrial applications
Professional Applications & Engineering Value
These 5/16"-18 UNC coarse thread hex head screws are engineered to address critical challenges in industrial assembly and construction. The steel construction combined with zinc plating delivers robust corrosion resistance, making them ideal for outdoor equipment, machinery frames, and structural applications where environmental exposure is a concern. The coarse UNC thread design ensures quick installation and superior holding power in wood, metal, and composite materials, reducing labor time and improving project efficiency. With a 60,000 PSI tensile strength and full threading, these screws provide reliable, long-lasting fastening solutions for heavy-duty applications, from manufacturing fixtures to infrastructure projects, minimizing maintenance needs and downtime.
Specification Summary & Compliance
This hex head screw features a Class 2A thread fit for standard tolerance applications, manufactured to ASME B18.2.1 dimensional standards and ASTM A307 material specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.
