S-90019A270 5/16"-18 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 performance with permanent nylon patch thread locker that maintains integrity from -55° to 250°F
- Exceptional strength for demanding applications through Grade 8 classification with 150,000 PSI tensile strength
- Superior corrosion protection provided by zinc yellow-chromate plated steel coating
- Reliable installation and removal with external hex drive design and Class 2A thread fit
- Maximum thread engagement through fully threaded UNC coarse thread design
- Consistent hardness and durability with Rockwell C33 rating for long service life
- Industry-standard compatibility meeting ASME B18.2.1 and SAE J429 specifications
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications where vibration resistance and reliable clamping force are critical, these Grade 8 hex head screws deliver exceptional performance in demanding environments. The permanent nylon patch thread locker prevents loosening under extreme vibration conditions, while the zinc yellow-chromate plated steel construction provides superior corrosion resistance in harsh operating conditions. The 5/16"-18 UNC coarse threads with Class 2A fit ensure quick installation and maximum holding power in machinery, equipment assembly, structural frameworks, and automotive applications. These high-strength fasteners maintain their mechanical properties across a wide temperature range from -55° to 250°F, making them ideal for applications subject to thermal cycling and environmental stresses.
Specification Summary & Compliance
These hex head screws feature precise Class 2A thread fit with 5/16"-18 UNC coarse threads and right-hand threading. Manufactured to ASME B18.2.1 and SAE J429 specifications, they ensure dimensional accuracy and performance reliability. The Grade 8 classification guarantees 150,000 PSI tensile strength and Rockwell C33 hardness, while the nylon patch thread locker provides permanent locking capability without compromising reusability. Compliance with industry standards ensures consistent quality and performance in critical applications.
