S-91247A894 7/8"-9 x 5 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, ideal for high-stress industrial applications
- Superior corrosion resistance provided by zinc plating, extending service life in demanding environments
- Reliable thread engagement through Class 2A thread fit and UNC coarse threading for secure fastening
- Optimized mechanical properties with Rockwell C25 hardness, balancing strength and ductility
- Enhanced torque transmission via external hex drive and substantial 1 5/16" head width
- Versatile partial threading allowing for both clamping and alignment functions in assembly
- Industry-standard compliance meeting ASME B18.2.1 specifications for consistent performance
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 5 hex head screws deliver critical performance where vibration resistance and structural integrity are paramount. The zinc plated finish provides essential corrosion protection in manufacturing facilities, construction sites, and machinery assembly. With 7/8"-9 UNC coarse threading and Class 2A thread fit, these fasteners ensure rapid installation and secure holding power in steel frameworks, equipment bases, and structural connections. The partial threading design allows for precise clamping force distribution while the external hex drive facilitates high-torque installation with standard tools. These industrial fasteners solve common engineering challenges including joint slippage, corrosion-induced failure, and installation inefficiency in critical assemblies.
Specification Summary & Compliance
This inch system fastener maintains precise Class 2A thread fit tolerances per UNC thread standards with 7/8"-9 thread size and coarse thread spacing. Manufacturing conforms to ASME B18.2.1 specifications (SAE J429) ensuring dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant (updated 01/17/2023), meeting international environmental and safety regulations for industrial components.
