S-94239A121 1/4"-20 x 1/2" SAE J429 High-Strength Grade 8 Steel Serrated-Flange Hex Head Screws
High-Strength Grade 8 Steel Serrated-Flange 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 demanding industrial applications
- Superior corrosion resistance through black phosphate steel coating extending service life in harsh environments
- Reliable vibration resistance with serrated locking features preventing loosening under dynamic loads
- Optimized installation efficiency through external hex drive design allowing high torque application
- Enhanced stability and distribution with integrated flange design reducing surface pressure
- Consistent threading performance with Class 2A UNC coarse threads ensuring precise fit and easy assembly
- Maximum thread engagement through fully threaded design providing superior holding power along entire length
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance in critical assemblies where vibration resistance and structural integrity are paramount. The black phosphate coating provides superior corrosion protection, making them ideal for automotive, construction, and machinery applications exposed to harsh environments. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures reliable performance under extreme loads, while the serrated locking feature beneath the head prevents rotational loosening in high-vibration settings. The UNC coarse thread design facilitates quick installation and provides excellent pull-out resistance in various materials, reducing assembly time while maintaining industrial-grade reliability.
Specification Summary & Compliance
This 1/4"-20 hex head screw features precision Class 2A thread fit with UNC coarse threading and right-hand thread direction. Manufactured to exacting standards including IFI 111 and SAE J429 specifications for Grade 8 fasteners. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors. The fastener maintains dimensional accuracy with 1/2" length, 3/8" head width, and 9/16" flange diameter for consistent performance in standardized applications.
