S-92620A827 5/8"-18 x 3" 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 capacity with 150,000 psi tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating in harsh industrial environments
- Precise thread engagement with UNF fine threading and Class 2A fit for vibration-resistant assemblies
- Exceptional durability from Grade 8 steel construction and Rockwell C33 hardness rating
- Easy installation and removal with standard external hex drive and 15/16" head width
- Full thread coverage along the 3" length for maximum grip and load distribution
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers exceptional engineering value in demanding applications where failure is not an option. The UNF fine threading provides superior resistance to vibration loosening compared to coarse threads, making it ideal for heavy machinery, automotive assemblies, and structural steel connections. The zinc yellow-chromate plating creates a robust barrier against corrosion in outdoor or chemically aggressive environments, significantly extending service life. With fully threaded design along its 3" length, engineers achieve maximum thread engagement for distributed stress loading. The external hex drive allows for high-torque installation using standard tools, while the Class 2A thread fit ensures consistent assembly without binding or cross-threading issues in production environments.
Specification Summary & Compliance
This fastener maintains precise Class 2A thread fit tolerance per UNF standards with 5/8"-18 fine threading and right-hand thread direction. Manufacturing complies with ASME B18.2.1 dimensional specifications and SAE J429 material requirements for Grade 8 classification. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining dimensional integrity. All materials and processes conform to RoHS and REACH environmental directives for industrial use.
