S-91309A594 5/16"-18 x 2 3/4" 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
- High tensile strength of 60,000 PSI ensures reliable performance in demanding applications, reducing the risk of fastener failure
- Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments
- Class 2A thread fit with UNC coarse threading enables faster assembly and better vibration resistance
- Fully threaded design offers maximum grip length and uniform load distribution across the entire fastener
- External hex drive with standard head dimensions allows for easy installation using common tools
- Rockwell B69 hardness rating maintains thread integrity and prevents stripping during repeated use
- Compliance with major industry standards including ASME B18.2.1 ensures quality and interchangeability
Professional Applications & Engineering Value
These 5/16"-18 UNC hex head screws deliver exceptional engineering value in heavy-duty industrial applications where vibration resistance and structural integrity are critical. The Grade 2 steel construction combined with zinc plating addresses common corrosion challenges in manufacturing facilities, construction sites, and machinery assembly. The coarse UNC threading provides superior performance in softer materials and high-vibration environments, while the external hex drive ensures secure tool engagement for precise torque application. These fully threaded fasteners are engineered to maintain clamping force under dynamic loads, making them ideal for structural connections, equipment frames, and industrial machinery where reliable fastening solutions are essential for operational safety and longevity.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread spacing for consistent performance. These screws conform to ASME B18.2.1 specifications and are manufactured from ASTM A307 steel. 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.
