S-91247A822 5/8"-11 x 8" 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
- Optimized thread engagement through Class 2A thread fit ensuring secure fastening and vibration resistance
- Enhanced installation efficiency with external hex drive design allowing high-torque application using standard tools
- Reduced cross-threading risk through coarse UNC thread spacing for quicker assembly and disassembly
- Controlled clamping force with partially threaded shank design preventing joint over-tightening
- Certified material integrity with Rockwell C25 hardness maintaining structural stability under stress
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering solutions for industrial assembly challenges where high tensile strength and corrosion protection are paramount. The zinc plated steel construction combined with coarse UNC threading provides exceptional resistance to vibrational loosening in heavy machinery, structural frameworks, and equipment manufacturing. The external hex drive configuration enables rapid installation with standard wrenches, while the partially threaded design ensures precise clamp load distribution. Engineered to withstand extreme mechanical stresses, these industrial hex screws maintain integrity in construction, automotive, and manufacturing applications where 120,000 psi tensile strength and consistent performance are non-negotiable requirements.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 5/8"-11 UNC coarse thread specifications. Complies with ASME B18.2.1 and SAE J429 Grade 5 standards for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features right-hand thread direction with minimum 1 3/4" thread length on an 8" overall length fastener.
