S-91571A334 1"-8 x 3" 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 demanding applications
- Superior wear resistance thanks to Rockwell C19 hardness, ensuring long service life under heavy loads
- Optimized load distribution through 1 1/4" grip length and partial threading design for enhanced joint stability
- Quick installation and removal with external hex drive and 1 5/8" head width for easy tool access
- Secure fastening in various materials using coarse 1"-8 UNC threads that resist vibration loosening
- Precise dimensional consistency with Class 2A thread fit ensuring proper engagement and alignment
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for sustainable operations
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections, heavy machinery assembly, and construction applications where failure is not an option. The high-strength steel composition combined with UNC coarse threading provides exceptional resistance to dynamic loads and vibration-induced loosening - a common challenge in industrial environments. The partially threaded design creates an optimal balance between shank strength and thread engagement, while the external hex drive enables high-torque installation without stripping. These heavy-duty hex screws are engineered to maintain clamping force integrity in critical joints, making them ideal for structural bolting applications requiring predictable, reliable performance under sustained stress conditions.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 2A thread fit tolerance for precision mating. Complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for structural bolting applications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 1"-8 UNC coarse threads with right-hand orientation and 3" overall length including 1 3/4" thread length and 1 1/4" grip length.
