S-91268A460 1 3/4"-5 x 8" ASME B18.2.1, ASTM A354BD 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 demanding structural and machinery applications
• Superior corrosion resistance and durability through Grade 8 steel construction with Rockwell C33 hardness
• Secure fastening with precise engagement thanks to Class 2A thread fit and coarse UNC threading
• Easy installation and removal with standard external hex drive and large 2 5/8" head width
• Optimized weight distribution through partial threading design with 4" minimum thread length
• Reliable performance in regulated environments with full compliance to RoHS 3 and REACH standards
• Industry-proven quality meeting ASME B18.2.1 and ASTM A354BD specifications

Professional Applications & Engineering Value

This Grade 8 heavy-duty hex head screw delivers critical performance in industrial settings where failure is not an option. The 1 3/4"-5 UNC coarse thread configuration provides superior grip in soft materials and faster installation times, while the partial threading design concentrates strength where needed most. Engineered from ASTM A354BD steel with Rockwell C33 hardness, this fastener withstands extreme vibration, heavy loads, and harsh environmental conditions common in construction equipment, structural steel connections, and heavy machinery assembly. The external hex drive and substantial head dimensions ensure reliable torque application without stripping, making it ideal for maintenance-critical applications where disassembly may be required.

Specification Summary & Compliance

This 8" length hex head screw features Class 2A thread fit tolerance per UNC standards with 4" minimum thread length. Manufactured to ASME B18.2.1 dimensional specifications and ASTM A354BD material requirements. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.