S-91571A352 1 1/4"-7 x 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
- Superior load-bearing capacity with 105,000 PSI tensile strength for demanding structural applications
- Enhanced durability and wear resistance thanks to Rockwell C19 hardness and high-strength steel construction
- Reliable coarse UNC threading ensures quick assembly and secure fastening in heavy-duty materials
- Precision Class 2A thread fit guarantees consistent performance and easy installation
- Partially threaded design provides optimal grip length control for structural connections
- Full compliance with major industry standards including ASME B18.2.6, ASTM A325, and ASTM F3125
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global projects
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver exceptional engineering value for structural fastening applications where failure is not an option. The combination of high-strength steel material and 1 1/4"-7 UNC coarse threading provides superior resistance to vibration loosening and dynamic loads common in construction, bridge work, and heavy machinery assembly. The external hex drive design allows for high torque application, ensuring tight, secure connections in critical joints. With partial threading and precise Class 2A thread fit, these fasteners eliminate the need for separate washers in many applications, reducing installation time while maintaining structural integrity under extreme conditions.
Specification Summary & Compliance
This heavy-duty hex head screw features precise Class 2A thread fit with 1 1/4"-7 UNC coarse threading and complies with ASME B18.2.6, ASTM A325, and ASTM F3125 specifications. The fastener maintains dimensional accuracy throughout its 4" length with 2" grip length and 2" thread length. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, making it suitable for international projects with strict regulatory standards.
