S-91247A409 9/16"-18 x 3" 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
- Superior load-bearing capacity with 120,000 psi tensile strength for reliable performance in high-stress applications
- Enhanced corrosion resistance through zinc plating, extending service life in demanding industrial environments
- Precise thread engagement with Class 2A fit and UNF fine threads for secure, vibration-resistant connections
- Optimized torque transmission through external hex drive design and 13/16" head width for easier installation
- Controlled thread engagement with partial threading that provides both gripping strength and clearance where needed
- Consistent hardness performance at Rockwell C25 ensuring dimensional stability under repeated loads
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications for reliable interchangeability
Professional Applications & Engineering Value
These Grade 5 hex head screws deliver exceptional engineering value in heavy machinery, structural assemblies, and industrial equipment where high tensile strength and reliable fastening are critical. The UNF fine thread configuration provides superior resistance to vibration loosening compared to coarse threads, while the zinc plating offers essential corrosion protection in challenging environments. The partially threaded design allows for precise clamp load distribution, making these industrial fasteners ideal for applications requiring both secure gripping and clearance, such as mounting brackets, machinery frames, and structural supports. The external hex drive ensures compatibility with standard tools and facilitates high-torque installation in confined spaces.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNF thread specification (9/16"-18). Compliant with ASME B18.2.1 and SAE J429 manufacturing specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards. Features Grade 5 strength classification with verified mechanical properties including 120,000 psi tensile strength and Rockwell C25 hardness.
