S-91571A276 5/8"-11 x 3 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 steel construction and 120,000 psi tensile strength for reliable performance in heavy-load applications
- Superior corrosion resistance and durability through high-quality steel material with Rockwell C19 hardness rating
- Optimal grip and clamping force with 2 1/4" grip length and partially threaded design for secure fastening in structural connections
- Easy installation and removal with external hex drive and 1 1/16" head width for standard wrench compatibility
- Precise thread engagement with Class 2A thread fit and UNC coarse thread pattern ensuring consistent performance
- Industry-standard compliance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality assurance
- Environmental regulation compliance with RoHS 3 and REACH standards for safe, sustainable industrial use
Professional Applications & Engineering Value
These Grade A325 steel hex head screws deliver critical engineering solutions for structural steel connections, heavy machinery assembly, and construction applications where vibration resistance and load-bearing capacity are paramount. The partially threaded design with UNC coarse threading provides superior clamping force distribution while preventing joint loosening under dynamic loads. The external hex drive configuration ensures reliable torque transmission during installation, making these high-tensile strength fasteners ideal for bridge construction, structural framing, and industrial equipment where failure is not an option. The combination of precise Class 2A thread fit and robust material properties addresses common challenges of bolt elongation and thread stripping in demanding environments.
Specification Summary & Compliance
This 5/8"-11 hex head screw features precise Class 2A thread fit with UNC coarse threading and maintains dimensional accuracy per ASME B18.2.6 specifications. Manufactured in compliance with ASTM A325 and ASTM F3125 standards for structural bolts, the fastener demonstrates full conformity with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global industrial markets.
