S-90303A128 1/4"-20 x 5/8" 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
- Surface Protection – Non-marring nylon tip prevents damage to sensitive surfaces during installation and use
- Exceptional Strength – 180,000 psi tensile strength and Rockwell C39 hardness ensure reliable performance under high-stress conditions
- Wide Temperature Tolerance – Operates effectively from -50° to 250°F, suitable for diverse industrial environments
- Precise Thread Engagement – Class 3A thread fit and UNC coarse threading provide secure, vibration-resistant fastening
- Corrosion-Resistant Finish – Black-oxide coating on alloy steel enhances durability and resists oxidation
- Easy Installation – Hex socket drive allows for high-torque application with standard tools in confined spaces
- Regulatory Compliance – Meets ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw with a protective nylon tip addresses critical industrial challenges where surface integrity and fastener reliability are paramount. The non-marring tip is ideal for applications in electronics, automotive assemblies, and precision machinery, preventing scratches and cosmetic damage. Its high tensile strength and Class 3A UNC thread fit ensure tight, secure connections that resist loosening under vibration and dynamic loads. The hex drive design facilitates efficient installation in tight spaces, while the temperature-resistant properties make it suitable for environments experiencing thermal fluctuations. Engineered to ASME B18.3 specifications, this fastener delivers consistent performance in demanding industrial fastening scenarios, reducing maintenance needs and enhancing operational longevity.
Specification Summary & Compliance
This socket head cap screw features precise 1/4"-20 UNC coarse threads with a Class 3A thread fit for superior engagement and tolerance control. Manufactured from alloy steel with a black-oxide finish, it complies with ASME B18.3 dimensional standards. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety requirements for industrial use.
