S-91571A449 1"-8 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 load-bearing capacity with 120,000 psi tensile strength for demanding structural applications
- Superior hardness and durability from Rockwell C19 steel construction that resists wear and deformation
- Reliable coarse UNC threading provides excellent grip and faster installation in heavy materials
- Precision Class 2A thread fit ensures smooth assembly and consistent performance
- Heavy-duty hex head design offers secure tool engagement and high torque capability
- Partial threading configuration optimizes clamping force distribution for structural connections
- Comprehensive compliance with major industry standards including ASME, ASTM, RoHS 3 and REACH
Professional Applications & Engineering Value
Engineered for structural steel connections and heavy industrial applications, these Grade A325 hex head screws deliver critical performance where failure is not an option. The 1"-8 UNC coarse thread design provides superior pull-out resistance in steel frameworks and construction assemblies, while the partially threaded configuration concentrates clamping force precisely where needed. Manufactured from high-strength steel with Rockwell C19 hardness, these external hex drive fasteners withstand extreme vibration and dynamic loads in bridge construction, structural steel framing, and heavy machinery. The 4 1/2" length with 2 3/4" grip length accommodates thick material stacks commonly encountered in industrial settings.
Specification Summary & Compliance
This heavy-duty hex head screw features precision Class 2A thread fit with 1"-8 UNC coarse threading and right-hand thread direction. Manufactured to exacting standards including ASME B18.2.6, ASTM A325, and ASTM F3125 specifications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The external hex drive with 1 5/8" head width provides optimal torque transmission for secure installations.
