S-90019A450 1/2"-13 x 1 1/4" 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 nylon patch thread locker prevents loosening in high-stress environments, maintaining joint integrity
- Exceptional load-bearing capacity with 150,000 PSI tensile strength and Grade 8 classification for heavy-duty applications
- Corrosion-resistant zinc yellow-chromate plating extends service life in demanding industrial conditions
- Reliable coarse UNC threading ensures quick assembly and superior resistance to cross-threading
- Wide temperature tolerance from -55° to 250°F maintains performance across extreme operating environments
- Precision Class 2A thread fit guarantees consistent engagement and reduced installation torque variability
- Full threading design provides maximum grip length and flexibility in material thickness applications
Professional Applications & Engineering Value
Engineered for critical industrial fastening applications, these Grade 8 hex head screws deliver exceptional mechanical performance where vibration resistance and structural integrity are paramount. The nylon patch thread locking technology eliminates the need for separate locking washers or chemical adhesives, providing permanent fastener security in machinery, structural steel connections, and heavy equipment assemblies. The combination of zinc yellow-chromate plated steel construction and UNC coarse threading ensures both corrosion protection and rapid installation in time-sensitive maintenance operations. With 150,000 PSI tensile strength and Rockwell C33 hardness, these fasteners withstand extreme static and dynamic loads while maintaining clamp force in high-vibration environments such as automotive frames, construction equipment, and industrial manufacturing systems.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerance for consistent mating with Class 2B internal threads. Features 1/2"-13 UNC coarse thread spacing with fully threaded design and external hex drive configuration. Compliant with RoHS and REACH environmental regulations for industrial use.
