S-94779A306 4-40 x 3/8" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
• Enhanced load distribution due to the wide rounded truss head design, reducing surface damage and improving joint integrity
• High tensile strength of 70,000 psi and Rockwell B70 hardness for reliable performance under stress
• Secure fastening with Class 2A thread fit and coarse UNC threads, ensuring precise engagement and vibration resistance
• Easy installation using standard Phillips No. 1 drive, reducing assembly time and tool wear
• Full 3/8" threading for maximum grip and uniform clamping force in various materials
• Compliance with ASME B18.6.3 and environmental standards like RoHS 3 and REACH, ensuring safety and regulatory adherence

Professional Applications & Engineering Value

These 4-40 UNC coarse thread screws with a Black-Oxide finish on 18-8 Stainless Steel address common industrial challenges like corrosion, vibration loosening, and installation efficiency. The rounded truss head provides a wide bearing surface, minimizing the risk of material damage in sensitive assemblies, while the Phillips No. 1 drive allows for quick, tool-compatible fastening in tight spaces. Ideal for electronics, machinery, and outdoor equipment, these screws offer high tensile strength and durability, reducing maintenance needs and downtime in demanding applications such as automotive or construction projects where consistent performance is critical.

Specification Summary & Compliance

This screw features precise Class 2A thread fit with UNC coarse threads and a length of 3/8", ensuring dimensional accuracy per manufacturing standards. It complies with ASME B18.6.3 for mechanical and dimensional requirements, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and material integrity for global industrial use.