S-90303A430 3/8"-16 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 during installation and removal, ideal for finished products and delicate assemblies
• Exceptional 180,000 psi tensile strength provides reliable clamping force and resistance to shear and tensile loads in demanding applications
• Black-oxide finish on alloy steel offers enhanced corrosion resistance for improved durability in various industrial environments
• Rockwell C39 hardness ensures high wear resistance and maintains thread integrity for repeated use and long service life
• Class 3A thread fit guarantees precise, high-quality engagement for secure fastening and vibration resistance
• Wide temperature tolerance (-50° to 250° F) allows for stable performance in both extreme cold and high-heat conditions
• Hex socket drive (5/16") enables high-torque installation with standard tools, reducing the risk of stripping and improving assembly efficiency

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to solve critical challenges in precision assembly and machinery. The UNC coarse thread (3/8"-16) and Class 3A fit provide superior holding power and vibration resistance, essential for dynamic industrial equipment. The integrated non-marring nylon tip is a key engineering solution for applications where surface preservation is paramount, such as in automotive trim, electronic enclosures, and high-value consumer products. Manufactured from high-strength alloy steel and finished with a protective black-oxide coating, this screw withstands harsh operational environments, making it a reliable choice for OEMs and MRO professionals who require a fastener that combines high tensile strength with damage-free installation.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC coarse thread with a precision Class 3A thread fit for accurate and reliable fastening. It is manufactured in accordance with ASME B18.3 specifications and meets material standards defined by ASTM A574. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global supply chains.