S-91268A811 5/8"-11 x 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 from Rockwell C33 hardness, ensuring long service life in demanding environments
- Reliable coarse UNC threading provides excellent engagement and reduces cross-threading risks during installation
- Precision Class 2A thread fit guarantees consistent performance and compatibility with standard nuts
- High-grade steel construction delivers exceptional durability and corrosion resistance for industrial use
- External hex drive design enables secure tool engagement and high torque application without slippage
- Partial threading configuration offers optimal clamping force distribution across joint surfaces
Professional Applications & Engineering Value
These Grade 8 steel hex head screws are engineered for heavy-duty industrial applications where failure is not an option. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides exceptional resistance to vibration loosening and fatigue failure in machinery, structural steel connections, and heavy equipment assembly. The coarse UNC threading ensures rapid installation and reliable performance in materials where fine threads might strip or fail. With partial threading and Class 2A fit, these fasteners deliver precise clamping force control while maintaining alignment integrity in critical joints. The external hex drive accommodates standard wrenching tools for easy installation and removal, even in confined spaces.
Specification Summary & Compliance
This 5/8"-11 UNC hex head screw features precise Class 2A thread fit tolerances and 2" length with minimum 1 1/2" thread length. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.
