S-91571A422 5/8"-11 x 5 1/2" 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 for reliable performance in demanding applications
- Superior durability achieved through Rockwell C19 hardness and high-strength steel construction
- Optimized load distribution with UNC coarse threading and Class 2A thread fit ensuring secure fastening
- Enhanced installation efficiency through external hex drive design providing maximum torque application
- Versatile partial threading allowing for both clamping and alignment functions in structural assemblies
- Comprehensive compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for guaranteed quality
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable industrial use
Professional Applications & Engineering Value
Engineered for critical structural applications, these Grade A325 hex head screws deliver exceptional performance where failure is not an option. The high-strength steel construction combined with UNC coarse threading provides superior resistance to vibration loosening and dynamic loads common in structural steel connections, bridge construction, and heavy machinery assemblies. The partially threaded design ensures optimal stress distribution while the external hex drive facilitates quick installation with standard tools. These heavy-duty structural bolts solve critical engineering challenges by maintaining integrity under extreme tension and shear forces, making them ideal for industrial fastening solutions requiring predictable, reliable performance.
Specification Summary & Compliance
This 5/8"-11 hex head screw features precise Class 2A thread fit tolerances and UNC coarse thread spacing manufactured to exacting standards. The fastener meets ASME B18.2.6 dimensional requirements and maintains compliance with ASTM A325 and ASTM F3125 material and performance specifications. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, ensuring these structural bolts meet current regulatory standards for industrial use.
