S-91268A831 5/8"-11 x 6 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Maximum load-bearing capability with 150,000 PSI tensile strength for critical structural applications
- Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
- Reliable thread engagement with Class 2A thread fit ensuring consistent assembly and vibration resistance
- Optimized for heavy-duty applications through Grade 8 strength classification and coarse UNC threading
- Secure installation and removal with external hex drive design providing superior torque transmission
- Partial threading design allows for precise clamping force distribution in multi-material assemblies
- Full regulatory compliance meeting ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications where failure is not an option, these Grade 8 hex head screws deliver exceptional performance in structural steel connections, heavy machinery assembly, and high-vibration environments. The 5/8"-11 UNC coarse threading provides superior resistance to loosening under dynamic loads, while the partially threaded design concentrates clamping force precisely where needed. Manufactured from high-strength steel with Rockwell C33 hardness, these fasteners withstand extreme tension and shear forces without compromising integrity. The external hex drive configuration ensures maximum torque application during installation, making them ideal for construction equipment, industrial platforms, and transportation infrastructure where 150,000 PSI tensile strength is critical for safety and longevity.
Specification Summary & Compliance
This 5/8"-11 UNC hex head screw features Class 2A thread fit for consistent assembly tolerance and meets ASME B18.2.1 and SAE J429 manufacturing specifications. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. With dimensions of 6½" length, 15/16" head width, and minimum 1½" thread length, this inch-system fastener delivers precision engineering for critical applications.
