S-91247A489 3/4"-16 x 7" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 Steel Hex Head Screws
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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, ideal for heavy-duty structural applications
- Superior corrosion resistance through zinc plating, extending service life in demanding environments
- Precise thread engagement with Class 2A UNF fine threads ensuring vibration-resistant connections
- Optimized torque transmission via external hex drive and 1 1/8" head width for secure installation
- Reliable mechanical properties backed by Grade 5 certification and Rockwell C25 hardness rating
- Versatile partial threading allowing both clamping force and alignment flexibility in assemblies
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interoperability
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 5 hex head screws solve critical fastening challenges in construction machinery, structural steel connections, and manufacturing equipment. The UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, while the zinc plating creates a sacrificial barrier against corrosion in outdoor or high-moisture environments. The partially threaded design allows the unthreaded shank to bear shear loads efficiently, making these external hex drive fasteners ideal for bolted joints requiring both clamping force and precise alignment. With 7-inch length and 2-inch minimum thread engagement, they accommodate thick material stacks common in structural steel and heavy equipment assembly.
Specification Summary & Compliance
Manufactured to Class 2A thread fit tolerances per UNF standards, these screws guarantee consistent mating with 3/4"-16 nuts and threaded components. Compliance with ASME B18.2.1 and SAE J429 specifications ensures dimensional uniformity and mechanical performance. Environmental regulations adherence includes RoHS 3 (2015/863/EU) compliance for restricted substance control and REACH (EC 1907/2006) conformity for chemical safety.
