S-91583A244 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 corrosion resistance from hot-dipped galvanized steel coating, ideal for outdoor and harsh industrial environments
- High tensile strength of 120,000 psi ensures reliable performance in heavy-duty structural and construction applications
- Rockwell C19 hardness provides excellent durability and resistance to deformation under high stress
- Coarse UNC threading with Class 2A fit allows for faster installation and better vibration resistance
- External hex drive design enables easy tightening with standard tools, reducing assembly time
- Partial threading with 2 3/4" grip length offers optimal clamping force distribution for structural connections
- Full compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125 for guaranteed quality
Professional Applications & Engineering Value
These Grade A325 hot-dipped galvanized steel hex head screws deliver critical engineering solutions for demanding structural applications. The hot-dipped galvanized coating provides superior corrosion protection, making them ideal for bridges, construction frameworks, and outdoor infrastructure exposed to harsh weather conditions. The combination of 120,000 psi tensile strength and Rockwell C19 hardness ensures these heavy-duty fasteners maintain structural integrity under extreme loads. The 1"-8 UNC coarse threading with Class 2A fit prevents cross-threading during installation while offering excellent vibration resistance in dynamic load environments. These partially threaded hex screws are engineered specifically for structural steel connections where reliable clamping force and corrosion resistance are paramount for long-term safety and performance.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and 1"-8 UNC coarse threading. Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting applications. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance for restricted substance control.
