S-91309A592 5/16"-18 x 2 1/4" 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
- Superior corrosion resistance with zinc plating, extending service life in demanding environments.
- High-strength steel construction provides a reliable 60,000 psi tensile strength for heavy-duty applications.
- Rockwell B69 hardness ensures excellent durability and resistance to wear and deformation.
- Coarse UNC threads with Class 2A fit offer faster assembly and reliable engagement in a wide range of materials.
- External hex drive and hex head design allows for high-torque installation with standard tools, simplifying maintenance.
- Full threading along the 2 1/4" length ensures maximum grip and holding power across the entire fastener.
- Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality, dimensional accuracy, and interchangeability.
Professional Applications & Engineering Value
This heavy-duty hex head screw is engineered to solve critical fastening challenges in industrial settings. The high-strength steel and zinc plating work in tandem to combat corrosion and mechanical stress, making it ideal for structural assemblies, machinery, and equipment that face constant load and environmental exposure. The coarse UNC thread and Class 2A fit provide quick, secure fastening in both metal and wood, reducing installation time while preventing stripping. Its fully threaded design and external hex drive offer superior clamping force and ease of use with common wrenches, ensuring reliable performance in construction, manufacturing, and maintenance applications where failure is not an option.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with a Class 2A thread fit for consistent dimensional accuracy and ease of assembly. It is manufactured in compliance with ASME B18.2.1 and ASTM A307 specifications, ensuring mechanical properties and interchangeability. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety standards for industrial use.
