S-90019A120 1/4"-20 x 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Thread-Locking Hex Head Screws
High-Strength Grade 8 Steel Thread-Locking 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
- Vibration-resistant locking with permanent nylon patch thread locker prevents loosening in high-stress environments
- Exceptional strength and durability with Grade 8 classification and 150,000 psi tensile strength for heavy-duty applications
- Superior corrosion protection through zinc yellow-chromate plating extends service life in harsh conditions
- Wide temperature tolerance from -55° to 250°F maintains performance across diverse operating environments
- Precise thread engagement with Class 2A UNC coarse threads ensures reliable installation and load distribution
- Optimized drive efficiency with external hex head design for secure tool engagement and torque application
- Industry compliance assurance meeting ASME B18.2.1 and SAE J429 specifications for quality and reliability
Professional Applications & Engineering Value
This Grade 8 hex head screw with nylon patch thread locker addresses critical vibration-induced failure points in industrial settings. The zinc yellow-chromate plated steel construction provides superior corrosion resistance for machinery, automotive, and construction applications exposed to environmental elements. The UNC coarse thread design with Class 2A fit ensures rapid installation and reliable performance in high-vibration environments where maintaining clamp load is essential. With 150,000 psi tensile strength and Rockwell C33 hardness, this fully threaded fastener delivers exceptional structural integrity for heavy-duty assemblies requiring permanent, vibration-resistant fastening solutions that withstand extreme temperature fluctuations from -55° to 250°F.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (1/4"-20) and 3/4" length. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. The fastener meets industry standards for Grade 8 strength classification with verified 150,000 psi tensile strength and Rockwell C33 hardness, ensuring consistent performance in demanding industrial applications.
