S-91268A380 5/8"-11 x 4 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
• Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life under demanding conditions
• Secure fastening with coarse UNC threads that provide excellent grip and reduce the risk of stripping in various materials
• Easy installation and removal thanks to the external hex drive design, compatible with standard wrenches
• Optimized strength-to-weight ratio from Grade 8 steel construction, ideal for heavy machinery and structural assemblies
• Partial threading design allows for precise clamping force control and vibration resistance in critical joints
• Full regulatory compliance including RoHS 3 and REACH, ensuring safe use in regulated industrial environments

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver unmatched reliability in construction, machinery assembly, and structural frameworks. The 5/8"-11 UNC coarse thread configuration ensures rapid installation and superior resistance to vibrational loosening, while the partial threading provides optimal stress distribution across fastened components. Manufactured from high-strength steel and heat-treated to Rockwell C33 hardness, these fasteners withstand extreme mechanical loads and environmental challenges. The external hex drive offers compatibility with standard tools, streamlining maintenance and reducing downtime in industrial strength scenarios where precision and durability are paramount.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 5/8"-11 UNC coarse thread specifications, ensuring consistent performance across assemblies. It strictly adheres to ASME B18.2.1 and SAE J429 manufacturing standards, guaranteeing dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industrial sectors without hazardous substance concerns.