S-91247A416 9/16"-18 x 5" 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 environments
- Precise thread engagement with Class 2A fit and UNF fine threading for secure fastening and vibration resistance
- Optimized torque transmission through external hex drive design for efficient installation with standard tools
- Grade 5 certification ensuring consistent mechanical properties and Rockwell C25 hardness for durability
- Versatile partial threading allowing both clamping and alignment functions in structural assemblies
- Regulatory compliance with RoHS 3 and REACH standards for environmentally responsible sourcing
Professional Applications & Engineering Value
This 9/16"-18 UNF hex head screw delivers exceptional engineering value in heavy-duty applications where vibration resistance and structural integrity are paramount. The Grade 5 steel construction combined with zinc plating addresses common industrial challenges including environmental exposure and dynamic loading conditions. The UNF fine threading provides superior thread engagement compared to coarse threads, making it ideal for precision equipment assembly, construction frameworks, and machinery manufacturing where loosening under vibration is a concern. The 5" length with partial threading offers flexibility for applications requiring both clamping force and clearance, while the external hex drive ensures compatibility with standard installation tools commonly available in industrial settings.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 specifications, this fastener maintains Class 2A thread fit tolerances for consistent performance. The 9/16"-18 UNF fine thread configuration ensures precise engagement, while the Rockwell C25 hardness and 120,000 psi tensile strength meet Grade 5 requirements. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety standards.
