S-91283A136 1 1/8"-7 x 3" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 100,000 psi tensile strength for reliable performance in high-stress assemblies
• Superior wear resistance due to Rockwell C19 hardness, extending service life in demanding environments
• Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring secure fastening and vibration resistance
• Simplified installation and removal with external hex drive and standard 1 11/16" head width for common tool compatibility
• Full-length threading provides consistent clamping force along the entire 3" length for uniform load distribution
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429, RoHS 3, and REACH standards for quality and safety
• Right-hand thread design enables standard clockwise tightening for intuitive assembly procedures

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for industrial applications requiring high tensile strength and durability. The 1 1/8"-7 UNC coarse thread configuration provides superior resistance to loosening under vibration, making it ideal for heavy machinery, structural steel connections, and equipment manufacturing. The fully threaded design ensures maximum thread engagement in thick materials, while the external hex drive accommodates standard wrenches for efficient installation in confined spaces. Manufactured from high-grade steel with precise Class 2A thread fit, this fastener maintains dimensional accuracy for consistent performance in critical assemblies where reliability cannot be compromised.

Specification Summary & Compliance

This 3" length hex head screw features 1 1/8"-7 UNC coarse threads with Class 2A thread fit per ASME standards, ensuring precise dimensional tolerances for reliable mating with corresponding nuts. The fastener complies with ASME B18.2.1 and SAE J429 Grade 5 specifications for mechanical properties and dimensional requirements. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming the absence of restricted substances for industrial applications worldwide.