S-91247A903 7/8"-9 x 9" 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 heavy-duty applications
- Superior corrosion resistance through zinc plating, extending service life in demanding industrial environments
- Optimized thread engagement with UNC coarse threading and Class 2A fit for faster assembly and secure fastening
- Enhanced durability from Rockwell C25 hardness, maintaining structural integrity under repeated stress
- Efficient installation and removal with external hex drive design providing maximum torque transmission
- Partial threading design offering superior clamping force distribution across connected materials
- Industry-standard compliance ensuring consistent quality and interchangeability across applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 5 hex head screws deliver exceptional performance in construction, heavy machinery, and structural assemblies. The zinc plated steel construction provides critical corrosion resistance in harsh environments, while the UNC coarse threading ensures rapid installation and superior vibration resistance. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening in dynamic load conditions. With external hex drive compatibility, these fasteners accommodate high-torque applications common in maintenance and manufacturing, making them ideal for heavy-duty fastening requirements where reliability cannot be compromised.
Specification Summary & Compliance
This 7/8"-9 UNC hex head screw features Class 2A thread fit for optimal assembly clearance and meets ASME B18.2.1 and SAE J429 Grade 5 specifications for dimensional accuracy and mechanical properties. The fastener is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental responsibility and regulatory adherence for global industrial applications.
