S-91286A437 5/8"-18 x 2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Maximum load-bearing capability with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc-flake coating that withstands harsh industrial environments
- Precise thread engagement with Class 2A fit and 5/8"-18 UNF fine threads ensuring vibration resistance and secure fastening
- Exceptional durability from Rockwell C33 hardness steel construction that maintains integrity under heavy stress
- Optimized installation efficiency with external hex drive design providing maximum torque transfer and easy wrench access
- Full-threaded reliability along the entire 2" length for consistent clamping force distribution
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding applications where failure is not an option. The zinc-flake coated steel construction addresses corrosion concerns in industrial environments, while the 5/8"-18 UNF fine thread with Class 2A fit provides superior vibration resistance compared to coarse threads. The external hex drive design enables high-torque installation in confined spaces, making these heavy-duty fasteners ideal for structural steel connections, heavy machinery assembly, and industrial equipment maintenance. With fully threaded design along the 2" length, engineers achieve uniform stress distribution across the entire engagement area, preventing joint loosening under dynamic loads.
Specification Summary & Compliance
This high-strength hex head screw features precision 5/8"-18 UNF fine threads with Class 2A thread fit tolerance for consistent installation performance. Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications, it delivers reliable mechanical properties including 150,000 psi tensile strength and Rockwell C33 hardness. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global industrial markets.
