S-90303A148 5/16"-18 x 1 1/2" ASME B18.3, ASTM A574 Nylon-Tip Alloy Steel Socket Head Screws
Nylon-Tip Alloy Steel Socket 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
- Exceptional strength and durability with 180,000 psi tensile strength and Rockwell C39 hardness, ideal for heavy-duty industrial applications.
- Non-marring surface protection thanks to the nylon tip, preventing damage to sensitive components in assembly and maintenance.
- Reliable thread engagement with Class 3A fit and UNC coarse threads, ensuring secure fastening and vibration resistance.
- Corrosion-resistant black-oxide finish on alloy steel, enhancing longevity in various environmental conditions.
- Wide temperature tolerance from -50° to 250°F, maintaining performance in extreme operational settings.
- Easy installation and removal with a standard hex drive socket head, providing efficient torque application.
- Full thread coverage for consistent clamping force along the entire 1-1/2" length, improving joint integrity.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in industrial settings, such as preventing surface damage and ensuring high-strength connections. The non-marring nylon tip is particularly valuable in applications involving delicate materials or finished surfaces, reducing the risk of scratches during assembly. With a Class 3A thread fit and UNC coarse threads, it offers superior resistance to loosening under vibration, making it ideal for machinery, automotive, and aerospace components. The combination of 180,000 psi tensile strength and Rockwell C39 hardness ensures reliable performance under heavy loads, while the black-oxide treatment provides added corrosion resistance. These features make it a go-to high-strength cap screw for engineers seeking durability and precision in demanding environments.
Specification Summary & Compliance
This socket head cap screw adheres to ASME B18.3 specifications, with precise Class 3A thread fit and UNC coarse threads for consistent dimensional accuracy. It is manufactured from alloy steel under ASTM A574 standards and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality for industrial use.
