S-91247A884 7/8"-9 x 3" 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 heavy-duty structural connections
- Superior corrosion resistance provided by zinc plating, extending service life in harsh industrial environments
- Optimized torque transmission through external hex drive design, ensuring secure installation with standard tools
- Reliable coarse threading (UNC) that resists loosening under vibration and enables faster assembly
- Controlled partial threading for precise clamping force distribution across joint interfaces
- Consistent mechanical properties with Rockwell C25 hardness, maintaining structural integrity under repeated stress
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical performance where structural integrity matters most. The 7/8"-9 UNC coarse thread configuration provides superior resistance to vibrational loosening in heavy machinery, construction equipment, and industrial framework assemblies. The zinc plated finish creates a sacrificial barrier against oxidation, significantly extending service life in environments with moisture or chemical exposure. With partial threading and Class 2A thread fit, engineers achieve precise clamp load control while maintaining rapid assembly speeds. The combination of 120,000 PSI tensile strength and Rockwell C25 hardness ensures reliable performance in high-stress applications without compromising ductility.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 5 standards with Class 2A thread fit for consistent dimensional accuracy. The inch system screw features 7/8"-9 UNC coarse threads, 3" length, and external hex drive configuration. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial applications.
