S-92620A828 5/8"-18 x 3 1/2" 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 capacity with 150,000 PSI tensile strength for critical structural applications
- Superior corrosion resistance through zinc yellow-chromate plating in demanding environments
- Precise thread engagement with UNF fine threading and Class 2A fit for vibration resistance
- Exceptional durability from Grade 8 steel with Rockwell C33 hardness for long service life
- Easy installation and removal with standard external hex drive design
- Full-threaded coverage along the 3½" length for maximum grip and load distribution
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver reliable performance where failure is not an option. The UNF fine threading provides superior resistance to vibration loosening compared to coarse threads, making them ideal for machinery, equipment assembly, and structural frameworks. The zinc yellow-chromate plating creates a protective barrier against corrosion in challenging environments, while the external hex drive allows for high-torque installation with standard tools. With 150,000 PSI tensile strength and Rockwell C33 hardness, these fully threaded fasteners maintain integrity under extreme loads, ensuring long-term reliability in construction, manufacturing, and automotive applications where inch system measurements are standard.
Specification Summary & Compliance
This 5/8"-18 UNF hex head screw features Class 2A thread fit for precise dimensional accuracy and proper clearance in assembly. Manufactured to meet ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and performance standards. The right-hand thread direction and fine thread spacing provide optimal clamping force distribution. The 3½" length with full threading offers complete engagement capability, while the zinc yellow-chromate finish provides environmental protection without compromising the Grade 8 strength classification.
