S-91583A607 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 corrosion resistance from hot-dipped galvanized steel coating, extending service life in harsh industrial environments
- Superior structural integrity with Grade A325 classification and 120,000 psi tensile strength for critical load-bearing applications
- Optimized installation efficiency through UNC coarse threading and external hex drive design for faster assembly
- Precise load distribution with 3 1/4" grip length ensuring secure clamping in structural connections
- Reduced cross-threading risk with Class 2A thread fit maintaining reliable engagement in high-vibration settings
- Enhanced durability from Rockwell C19 hardness providing excellent resistance to wear and deformation
- Regulatory compliance assurance meeting RoHS 3 and REACH environmental standards for global project specifications
Professional Applications & Engineering Value
Engineered for structural steel connections in construction and heavy machinery, these Grade A325 hex head screws solve critical challenges in load-bearing assemblies. The hot-dipped galvanized steel construction provides superior corrosion protection for outdoor infrastructure and industrial facilities exposed to moisture and chemicals. The partially threaded design with UNC coarse threading ensures optimal clamp load distribution while facilitating quicker installation in structural steel members. With 120,000 psi tensile strength and controlled Rockwell C19 hardness, these fasteners maintain structural integrity under dynamic loads and vibration, making them ideal for bridge construction, building frameworks, and heavy equipment manufacturing where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNC coarse threading (1/2"-13) for reliable engagement. Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 structural bolt specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for environmental safety. Features include 4 1/4" overall length with 3 1/4" grip length and external hex drive configuration for standard wrench applications.
