S-91268A798 9/16"-12 x 5 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 150,000 psi tensile strength for reliable performance in demanding applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life under high-stress conditions
- Optimized coarse thread design (9/16"-12 UNC) provides faster installation and superior vibration resistance
- Precision Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks during assembly
- Heavy-duty Grade 8 certification meets rigorous ASME B18.2.1 and SAE J429 standards for industrial applications
- Partial threading configuration allows for precise clamping force distribution across joint interfaces
- Environmental compliance assurance with RoHS 3 and REACH regulations for sustainable procurement
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and durability are paramount. The steel construction combined with Rockwell C33 hardness provides exceptional resistance to shear forces and fatigue in heavy machinery, structural steel connections, and industrial equipment assemblies. The 9/16"-12 UNC coarse thread configuration ensures rapid installation in thick materials while maintaining vibration resistance in dynamic load environments. The external hex drive design accommodates high-torque applications, making these partially threaded fasteners ideal for precision clamping in construction, manufacturing, and automotive sectors where joint integrity cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 2A thread fit tolerance for precision assembly. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications for mechanical properties and dimensional standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features right-hand thread direction with coarse thread spacing and minimum 1-3/8" thread length on a 5-1/2" overall partially threaded shank.
