S-91257A822 5/8"-11 x 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 capacity with 150,000 psi tensile strength for reliable performance in demanding applications.
- Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments.
- High durability and wear resistance due to Rockwell C33 hardness, maintaining integrity under repeated stress.
- Secure and precise fastening with UNC coarse threads and Class 2A fit, reducing the risk of cross-threading and ensuring easy installation.
- Optimized for high-torque applications featuring an external hex drive and hex head design for efficient wrenching.
- Versatile partial threading allows for effective clamping where full threads are not required, improving application flexibility.
- Compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and reliability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered to address critical industrial challenges, such as structural integrity in heavy machinery, construction, and automotive assemblies. The 5/8"-11 UNC coarse thread design, combined with Class 2A thread fit, delivers precise engagement and reduces installation errors, while the zinc yellow-chromate plating offers robust protection against corrosion, even in outdoor or chemically exposed settings. With a 150,000 psi tensile strength and Rockwell C33 hardness, it withstands extreme vibrations and loads, minimizing maintenance needs. The partial threading ensures optimal grip in bolted joints, making it ideal for applications requiring strong, reliable fasteners that meet ASME B18.2.1 and SAE J429 specifications for safety and performance.
Specification Summary & Compliance
This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent accuracy and UNC coarse threads with a size of 5/8"-11. It complies with ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring reliability in industrial use. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global supply chains.
