S-92620A538 1/4"-28 x 5/8" 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
- Exceptional load-bearing capability with 150,000 PSI tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through zinc yellow-chromate plating, extending service life in harsh environments
- Precise thread engagement with Class 2A UNF fine threads ensuring secure, vibration-resistant connections
- Maximum hardness durability at Rockwell C33 to maintain structural integrity under repeated use
- Full-length threading provides consistent grip strength across the entire fastener length
- Heavy-duty construction meeting Grade 8 specifications for demanding industrial applications
- External hex drive design enables high-torque installation with standard tools
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering value in heavy machinery, automotive assemblies, and structural applications where vibration resistance and long-term reliability are paramount. The UNF fine thread configuration provides superior clamping force distribution compared to coarse threads, while the zinc yellow-chromate finish creates a protective barrier against oxidation and chemical exposure. The fully threaded design ensures maximum engagement in both thick and thin materials, eliminating the need for multiple fastener types. With 150,000 PSI tensile strength and Rockwell C33 hardness, these screws maintain their mechanical properties under extreme loads and temperature variations, making them ideal for critical joints in construction equipment, manufacturing fixtures, and transportation systems.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerances for precise installation. Features 1/4"-28 UNF fine threads with right-hand orientation and 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets.
