S-91571A278 5/8"-11 x 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 for reliable performance in heavy-load applications
- Superior wear resistance due to Rockwell C19 hardness, ensuring extended service life in demanding industrial environments
- Optimized thread engagement with 5/8"-11 UNC coarse threads and Class 2A fit for faster assembly and vibration resistance
- Enhanced installation efficiency through external hex drive design and 1 1/16" head width for secure tool engagement
- Controlled thread distribution with partial threading and 2 3/4" grip length for precise clamping force management
- Regulatory compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality verification
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable industrial operations
Professional Applications & Engineering Value
Engineered for structural steel connections and heavy machinery assembly, these Grade A325 hex head screws deliver critical performance where failure is not an option. The partially threaded design concentrates stress away from the shear plane, while the coarse UNC threads provide superior resistance to vibration loosening in dynamic load environments. Manufactured from high-strength steel with controlled hardness (Rockwell C19), these fasteners maintain clamping force under extreme tension, making them ideal for construction applications, bridgework, and industrial equipment requiring predictable, durable fastening solutions that meet rigorous engineering standards.
Specification Summary & Compliance
This 5/8"-11 hex head screw features precise Class 2A thread fit tolerances and right-hand UNC coarse threading per ASME standards. Manufacturing complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for industrial use.
