S-91571A406 1/2"-13 x 4 1/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
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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
- Exceptional structural integrity with Grade A325 classification and 120,000 psi tensile strength, ensuring reliable performance in heavy-load applications.
- Superior durability from Rockwell C19 hardness steel, providing excellent resistance to wear and deformation under stress.
- Optimized grip and alignment with a 3 1/4" grip length and 4 1/4" overall length, offering secure fastening in thick materials.
- Efficient installation and removal thanks to the external hex drive and 7/8" head width, allowing for high-torque application with standard tools.
- Reliable thread engagement with 1/2"-13 UNC coarse threading and Class 2A fit, reducing cross-threading risks and speeding up assembly.
- Versatile partial threading design, ideal for applications where unthreaded shank strength is critical, such as structural steel connections.
- Compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125, ensuring consistent quality and interoperability.
Professional Applications & Engineering Value
Engineered for demanding environments, this Grade A325 hex head screw delivers robust performance in structural and construction applications. The high-strength steel construction, combined with a Rockwell C19 hardness, resists shear and tensile forces, making it ideal for heavy-duty fastening in bridges, buildings, and machinery. The 1/2"-13 UNC coarse thread and partial threading enhance load distribution and prevent loosening under vibration. With an external hex drive and right-hand thread, it ensures quick, secure installation, reducing labor time and improving project efficiency in industrial settings.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards with a Class 2A thread fit and UNC coarse threading, ensuring compatibility and ease of use. It meets ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolts. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, supporting environmental and safety regulations in global markets.
