S-91247A407 9/16"-18 x 2 1/2" 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 for reliable performance in demanding applications
- Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments
- Precise thread engagement with UNF fine threading and Class 2A fit ensuring secure fastening and vibration resistance
- Optimized strength-to-weight ratio through Grade 5 steel construction with Rockwell C25 hardness
- Enhanced installation efficiency with external hex drive design allowing for high torque application
- Versatile partial threading enabling both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME B18.2.1 and SAE J429 standards for quality and safety
Professional Applications & Engineering Value
This 9/16"-18 UNF hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where vibration resistance and high tensile demands are paramount. The Grade 5 steel construction combined with Rockwell C25 hardness provides exceptional durability against mechanical stress, while the zinc plating offers reliable protection against corrosion in challenging environments. The UNF fine threading ensures precise fitment and superior clamping force distribution, making it ideal for applications requiring repeated disassembly and reassembly. Engineered to withstand extreme conditions, this partially threaded fastener provides both secure fastening and alignment capabilities across automotive, construction, and manufacturing sectors.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 specifications with Class 2A thread fit tolerance for precision engagement. Features 9/16"-18 UNF fine threading with minimum thread length of 1-3/8" and overall length of 2-1/2". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
