S-92620A751 1/2"-20 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
- Exceptional tensile strength of 150,000 psi provides reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments.
- High hardness rating (Rockwell C33) ensures excellent wear resistance and durability under heavy loads.
- Fine UNF threading with Class 2A fit offers precise engagement and vibration resistance in critical assemblies.
- Full threading along the 3 1/2" length allows for maximum adjustability and secure fastening in thick materials.
- External hex drive design enables easy installation and high torque application with standard tools.
- Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
These Grade 8 hex head screws are engineered for demanding applications where failure is not an option. The steel construction combined with 150,000 psi tensile strength and Rockwell C33 hardness makes them ideal for heavy machinery, structural frameworks, and automotive assemblies subjected to dynamic loads and vibrations. The fine UNF thread (1/2"-20) provides superior clamping force and resistance to loosening compared to coarse threads. With zinc yellow-chromate plating, these fasteners deliver extended protection against corrosion in outdoor or chemically aggressive environments. The fully threaded design ensures maximum thread engagement in deep applications, while the external hex drive allows for efficient installation in confined spaces common in industrial equipment maintenance and manufacturing.
Specification Summary & Compliance
This 3 1/2" length hex head screw features a 1/2"-20 UNF fine thread with Class 2A thread fit for precise dimensional accuracy. Manufactured from high-strength steel with zinc yellow-chromate plating finish. Complies with ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, ensuring consistent performance and reliability in industrial applications.
