S-91571A270 5/8"-11 x 2 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 load-bearing capacity with 120,000 psi tensile strength for reliable performance in heavy-duty structural connections
- Superior hardness and durability with Rockwell C19 rating to resist wear and deformation under high-stress conditions
- Optimized coarse threading (UNC) provides faster assembly and reduced cross-threading risk in industrial applications
- Precision Class 2A thread fit ensures consistent engagement and vibration resistance in demanding environments
- Partially threaded design allows for controlled clamping force and secure joint integrity
- Full compliance with ASME B18.2.6, ASTM A325, and ASTM F3125 guarantees interchangeability and engineering reliability
- External hex drive with 1 1/16" head width enables high-torque installation using standard tools
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical performance for structural steel connections, bridge construction, and heavy machinery assembly where failure is not an option. The high-strength steel composition and UNC coarse threading provide superior resistance to dynamic loads and vibration loosening, addressing common industrial fastening challenges. The partially threaded shank ensures that the unthreaded portion bears directly against connected materials, preventing joint slippage while the Class 2A thread fit maintains precise tolerances for consistent installation. With external hex drive compatibility, these screws accommodate high-torque applications across construction, infrastructure, and manufacturing sectors where reliability and compliance with engineering specifications are paramount.
Specification Summary & Compliance
This 5/8"-11 UNC hex head screw features precise Class 2A thread fit per ASME standards with 2 1/2" overall length and 1 1/4" thread length. Manufactured to meet ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
