S-90303A440 3/8"-16 x 1 1/2" 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 to sensitive components while maintaining secure fastening
• Exceptional 180,000 psi tensile strength delivers reliable performance in high-stress industrial applications
• Precision Class 3A thread fit ensures consistent engagement and vibration resistance in demanding environments
• Black-oxide alloy steel construction provides superior corrosion resistance and extended service life
• Wide temperature tolerance (-50° to 250°F) maintains performance across diverse operating conditions
• Standard hex drive compatibility enables quick installation with common 5/16" tools
• Full threading design allows for maximum adjustability and uniform load distribution

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw with non-marring nylon tip addresses critical challenges in precision assembly applications where surface protection and high-strength fastening are paramount. The combination of Rockwell C39 hardness and 180,000 psi tensile strength ensures reliable performance in machinery, automotive, and aerospace components subjected to extreme mechanical stresses. The UNC coarse thread pattern with Class 3A fit provides superior vibration resistance while the nylon tip eliminates damage to finished surfaces, making it ideal for securing delicate electronic enclosures, precision instruments, and decorative fixtures without compromising structural integrity.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNC 3/8"-16 coarse threading. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The screw features fully threaded design, right-hand thread direction, and meets ASTM A574 material standards for consistent quality and performance in industrial applications.