S-90019A110 1/4"-20 x 1/2" 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
- Superior vibration resistance with nylon patch thread locker that maintains locking performance from -55° to 250°F
- Exceptional tensile strength of 150,000 psi for heavy-duty applications requiring maximum load capacity
- Enhanced corrosion protection through zinc yellow-chromate plating on steel for extended service life
- Reliable installation and removal with external hex drive design providing secure tool engagement
- Precise thread fit with Class 2A UNC coarse threads ensuring consistent mating with standard nuts
- Full thread coverage along the 1/2" length for maximum grip and load distribution
- Certified quality assurance meeting ASME B18.2.1 and SAE J429 specifications for industrial reliability
Professional Applications & Engineering Value
These Grade 8 hex head screws with nylon patch thread locking technology provide critical vibration resistance in demanding industrial environments. The zinc yellow-chromate plated steel construction offers superior corrosion protection while maintaining the 150,000 psi tensile strength required for heavy machinery, automotive assemblies, and structural applications. The UNC coarse threads with Class 2A fit ensure rapid installation and reliable performance in high-vibration settings where fastener loosening can lead to equipment failure. Engineered for external hex drive compatibility, these fully threaded fasteners deliver maximum clamping force and are ideal for applications requiring repeated maintenance access without compromising thread integrity.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerance. Features UNC coarse threads (1/4"-20) with right-hand direction and full threading along the 1/2" length. The Rockwell C33 hardness rating ensures durability while the nylon patch thread locker maintains performance across the specified temperature range. Compliant with industrial standards for heavy-duty fastener applications requiring verified mechanical properties and dimensional accuracy.
