S-92620A553 1/4"-20 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, ideal for high-stress structural connections
- Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh environments
- Exceptional hardness and durability with Rockwell C33 rating, resisting wear and deformation under heavy loads
- Reliable thread engagement through Class 2A fit UNC coarse threads, ensuring secure fastening and vibration resistance
- Easy installation and removal with external hex drive design, compatible with standard wrenches for efficient maintenance
- Full-length threading for consistent grip along the entire 3" length, providing uniform clamping force
- Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications, guaranteeing interchangeability and quality assurance
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The steel construction combined with zinc yellow-chromate plating provides robust protection against corrosion in manufacturing plants, construction sites, and machinery assembly. The coarse UNC thread design ensures rapid installation and superior resistance to loosening under dynamic loads, while the external hex drive offers high torque capability without stripping. These fully threaded fasteners maintain consistent 150,000 psi tensile strength across the entire shank, making them ideal for structural steel connections, heavy equipment maintenance, and automotive assemblies where vibration and shock loads are common.
Specification Summary & Compliance
This 1/4"-20 x 3" hex head screw features Class 2A thread fit per UNC standards with right-hand threading direction. Manufactured to meet ASME B18.2.1 dimensional requirements and SAE J429 material specifications for Grade 8 fasteners. The product complies with industry standards for dimensional accuracy and mechanical properties, ensuring reliable performance in regulated industrial environments.
