S-91268A855 3/4"-10 x 3" 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 in demanding environments
• Optimized thread engagement through UNC coarse threading with Class 2A fit, providing secure fastening and vibration resistance
• Easy installation and removal with external hex drive and 1 1/8" head width, allowing for standard tool compatibility
• Partial threading design offering precise clamping force control where full thread engagement isn't required
• Heavy-duty construction using Grade 8 steel material, delivering maximum durability for industrial applications
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This Grade 8 hex head screw addresses critical engineering challenges in heavy machinery, structural steel connections, and industrial equipment assembly. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness provides exceptional resistance to shear forces and mechanical stress, preventing fastener failure in vibration-intensive environments. The UNC coarse threading with Class 2A fit ensures reliable engagement in various materials while the partially threaded design allows for precise clamping control in applications requiring specific unthreaded shank sections. The external hex drive with substantial 1 1/8" head width delivers superior torque transmission during installation, making it ideal for construction equipment, agricultural machinery, and industrial maintenance where heavy-duty fastening solutions are essential.

Specification Summary & Compliance

This 3/4"-10 hex head screw features precise Class 2A thread fit tolerance and UNC coarse thread spacing with a minimum thread length of 1 3/4". Manufactured in compliance with ASME B18.2.1 and SAE J429 Grade 8 specifications, ensuring dimensional accuracy and mechanical properties. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for industrial components.