S-92620A563 1/4"-28 x 3/4" 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, ideal for high-stress industrial assemblies
- Superior corrosion resistance from zinc yellow-chromate plating, extending service life in harsh environments
- Reliable fine thread engagement with UNF 1/4"-28 threads and Class 2A fit for vibration-resistant connections
- Heavy-duty durability backed by Grade 8 classification and Rockwell C33 hardness for repeated use
- Easy installation and removal with external hex drive and standard 7/16" head width
- Full-thread design ensures maximum grip length and uniform stress distribution
- Compliance with major industry standards including ASME B18.2.1 and SAE J429
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Grade 8 hex head screws deliver critical performance where failure is not an option. The UNF fine thread configuration provides superior resistance to loosening under vibration, making them ideal for machinery, automotive, and structural assemblies. Combined with zinc yellow-chromate plating, they offer enhanced protection against corrosion in outdoor or chemically exposed environments. The fully threaded design ensures consistent clamping force across the entire 3/4" length, while the external hex drive allows for high-torque installation with standard tools. These heavy-duty fasteners solve common engineering challenges by maintaining joint integrity under extreme static and dynamic loads.
Specification Summary & Compliance
This 1/4"-28 hex head screw maintains Class 2A thread fit tolerances per UNF standards, ensuring precise engagement. Manufacturing conforms to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety requirements for industrial use worldwide.
