S-90019A280 5/16"-18 x 1 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
- Vibration-resistant locking with nylon patch thread locker prevents loosening in high-stress environments, maintaining assembly integrity.
- Exceptional tensile strength of 150,000 psi ensures reliable performance in heavy-duty and structural applications.
- Corrosion protection from zinc yellow-chromate plating extends service life in harsh industrial conditions.
- High hardness rating (Rockwell C33) provides superior wear resistance and durability under repeated loads.
- Temperature stability with thread locker effective from -55° to 250°F, suitable for varied operational environments.
- Easy installation and removal with external hex drive and coarse UNC threads for quick assembly in coarse-grained materials.
- Partial threading design allows for precise clamping force control and reduced risk of cross-threading.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these Grade 8 hex head screws combine zinc yellow-chromate plated steel with a nylon patch thread locker to address common challenges like vibration-induced loosening and corrosion. The coarse UNC threads and partial threading enhance grip in soft materials and prevent over-tightening, while the high tensile strength and hardness ensure longevity in heavy machinery, automotive assemblies, and construction projects. Ideal for applications requiring reliable vibration resistance and consistent performance under thermal fluctuations, these screws reduce maintenance needs and downtime.
Specification Summary & Compliance
This fastener adheres to Class 2A thread fit for precise engagement and meets ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. The zinc yellow-chromate plating offers RoHS and REACH compliance for environmental safety, while the Grade 8 strength classification and material properties confirm suitability for high-stress industrial use.
