S-91583A624 7/8"-9 x 4 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 corrosion resistance through hot-dipped galvanized steel coating, ideal for outdoor and harsh industrial environments
- Superior structural integrity with Grade A325 classification and 120,000 psi tensile strength for heavy-load applications
- Optimized thread engagement with coarse UNC threading and Class 2A fit ensuring reliable installation and vibration resistance
- Enhanced installation efficiency featuring external hex drive and partially threaded design for precise clamping control
- Long-term durability backed by Rockwell C19 hardness for maintained performance under repeated stress
- Regulatory compliance assurance meeting ASME, ASTM, RoHS 3, and REACH standards for global project specifications
- Versatile grip length of 3" accommodates varying material thicknesses in structural assemblies
Professional Applications & Engineering Value
Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws address critical challenges in construction and industrial sectors. The hot-dipped galvanized coating provides a sacrificial layer that actively prevents rust formation in humid or chemically aggressive environments, eliminating premature fastener failure. Combined with coarse UNC threads and partial threading, the design ensures optimal stress distribution across connected materials while preventing loosening under dynamic loads. These industrial hex screws deliver consistent performance in bridge construction, transmission towers, and equipment frameworks where 120,000 psi tensile strength and corrosion resistance are non-negotiable for project safety and longevity.
Specification Summary & Compliance
These 7/8"-9 UNC hex head screws maintain precision Class 2A thread fit with standardized coarse threading for consistent engagement. Manufacturing adheres to ASME B18.2.6 dimensional specifications and ASTM A325/ASTM F3125 material standards. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance for industrial procurement.
