S-91571A252 1/2"-13 x 1 3/4" 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 demanding applications
- Superior wear resistance thanks to Rockwell C19 hardness, ensuring extended service life under repetitive stress
- Optimized load distribution through the 3/4" grip length design, minimizing material fatigue and joint failure
- Quick installation and removal with external hex drive and 7/8" head width, compatible with standard tools
- Secure coarse thread engagement using 1/2"-13 UNC threading, providing excellent vibration resistance in structural connections
- Precision manufacturing with Class 2A thread fit ensuring consistent performance and easy assembly
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for global industrial applications
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 ASTM A325 compliant steel construction combined with partial threading creates an optimal balance between shear strength and clamping force distribution. The coarse UNC thread pattern provides superior resistance to vibration loosening in dynamic load environments, while the external hex drive enables high-torque installation without stripping. These heavy-duty fasteners are engineered to withstand extreme tension and shear loads in bridge construction, structural framing, and industrial equipment where 120,000 psi tensile strength and reliable performance are paramount for safety and longevity.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse threading and right-hand thread direction. Complies with ASME B18.2.6 dimensional specifications, ASTM A325 material requirements, and ASTM F3125 structural bolt standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance regulations for unrestricted use in industrial markets.
