S-91247A885 7/8"-9 x 3 1/4" 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 demanding applications
- Enhanced corrosion resistance through zinc plating, extending service life in harsh industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and vibration resistance
- Exceptional mechanical durability from Rockwell C25 hardness, maintaining structural integrity under stress
- Secure external hex drive providing positive torque transmission and easy installation with standard tools
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
- Partial threading design offering both gripping strength and clearance where needed in structural applications
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical engineering solutions for industrial fastening challenges where high tensile strength and reliable performance are paramount. The 7/8"-9 UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening in heavy machinery, structural steel connections, and equipment assembly. The zinc plated finish provides essential corrosion protection for applications exposed to environmental elements, while the partially threaded design allows for precise clamping force distribution. Engineered to ASME B18.2.1 standards, this external hex drive fastener offers consistent performance in construction, manufacturing, and maintenance operations where 120,000 psi tensile strength is required for safety-critical connections.
Specification Summary & Compliance
This inch system fastener features precise Class 2A thread fit tolerances and UNC coarse threading per industry standards. Manufacturing complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.
