S-95599A114 4-40 x 1/2" Stainless Steel Oversized-Flange Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments
• Enhanced torque transmission via the 1/16" hex drive, reducing tool slippage and assembly time
• Reliable load distribution thanks to the integrated flange, minimizing surface damage and loosening
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for demanding applications
• Easy, quick installation with coarse UNC threads and Class 2A fit, ensuring consistent engagement
• Wide button head profile provides a low-profile, finished look while improving grip and accessibility
• Full regulatory compliance with RoHS 3 and REACH, meeting strict international environmental standards

Professional Applications & Engineering Value

This 4-40 UNC flanged rounded head screw is engineered from 18-8 Stainless Steel to deliver exceptional durability and corrosion resistance in demanding settings. The coarse thread design and Class 2A thread fit enable rapid, secure fastening in materials like metal, plastic, and composites, reducing the risk of cross-threading. The flanged button head eliminates the need for separate washers, distributing clamp load evenly and preventing surface marring. Combined with a 1/16" hex drive, it ensures high torque capability without cam-out, making it ideal for industrial assembly, machinery, electronics, and automotive applications where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A tolerance for precise fit, and is fully threaded for consistent holding power. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances. Manufactured to high standards, it offers reliable performance in various industrial fastening scenarios.