S-90303A135 1/4"-20 x 1" ASME B18.3, ASTM A574 Nylon-Tip Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Non-marring nylon tip prevents surface damage on sensitive components, ideal for precision assemblies and finished products
• Exceptional tensile strength of 180,000 psi ensures reliable performance under high-stress conditions and reduces risk of fastener failure
• Black-oxide coating on alloy steel provides corrosion resistance and enhanced durability in demanding industrial environments
• Class 3A thread fit with UNC coarse threading delivers superior engagement and vibration resistance in high-torque applications
• Wide temperature tolerance (-50° to 250°F) maintains tip integrity across extreme thermal conditions without compromising performance
• Socket head design with 3/16" hex drive allows for high torque application and easy installation in confined spaces
• Rockwell C39 hardness rating ensures long-term wear resistance and maintains thread integrity through repeated use

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw with protective nylon tip addresses critical challenges in precision manufacturing and assembly operations. The non-marring tip eliminates surface damage on delicate components while maintaining secure fastening, making it particularly valuable in electronics, automotive trim, and finished product assembly where cosmetic appearance is paramount. The UNC coarse thread configuration with Class 3A fit provides excellent vibration resistance in high-torque applications, reducing maintenance requirements in machinery and equipment. The combination of 180,000 psi tensile strength and Rockwell C39 hardness ensures reliable performance in structural applications where fastener integrity is critical to operational safety and longevity.

Specification Summary & Compliance

This 1/4"-20 socket head cap screw features precise Class 3A thread fit with UNC coarse threading and full threading along the 1" length. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel material with black-oxide surface treatment. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial applications.