S-92620A310 5/8"-18 x 1 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 psi tensile strength for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments
• Precise thread engagement with Class 2A fit UNF fine threads ensuring vibration-resistant connections
• Exceptional durability from Grade 8 steel construction with Rockwell C33 hardness for long service life
• Easy installation and removal with external hex drive design accommodating standard wrench tools
• Full-threaded reliability providing consistent clamping force along the entire 1 3/4" length
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards and environmental regulations

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these Grade 8 hex head screws deliver exceptional performance in heavy machinery, construction equipment, and structural assemblies where failure is not an option. The 5/8"-18 UNF fine thread configuration provides superior resistance to vibration loosening compared to coarse threads, while the zinc yellow-chromate plating creates a protective barrier against corrosion in outdoor or chemically aggressive environments. The fully threaded design ensures maximum thread engagement throughout the fastener length, distributing stress evenly and preventing premature failure. With Rockwell C33 hardness and 150,000 psi tensile strength, these steel fasteners maintain integrity under extreme loads, making them ideal for critical connections in automotive, manufacturing, and infrastructure projects where reliability and safety are paramount.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 5/8"-18 UNF fine threads and right-hand threading direction. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, the fastener demonstrates compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The external hex drive with 15/16" head width and 27/64" head height ensures compatibility with standard industrial tools, while the 1 3/4" length provides optimal engagement for various material thicknesses.