S-95599A111 4-40 x 3/16" Stainless Steel Oversized-Flange Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability
• High tensile strength of 80,000 psi ensures secure, vibration-resistant fastening in demanding applications
• Integrated flange design eliminates the need for separate washers, speeding up assembly and reducing part count
• Hex drive (1/16") provides superior torque transmission and reduces the risk of stripping during installation
• Coarse UNC threads with Class 2A fit offer quick, easy engagement and reliable performance in various materials
• Fully threaded construction maximizes grip length and distributes load evenly for enhanced joint integrity
• Compliance with RoHS 3 and REACH standards ensures environmental safety and regulatory acceptance for global markets

Professional Applications & Engineering Value

These 4-40 UNC rounded head flanged screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The 18-8 Stainless Steel material provides excellent resistance to rust and chemical exposure, making them suitable for outdoor equipment, marine hardware, and food processing machinery. The flanged button head design combines a low-profile aesthetic with functional benefits—the built-in flange increases bearing surface, preventing surface damage and improving clamp load distribution. Paired with a hex drive and coarse threads, these screws enable rapid installation and removal, reducing labor time in high-volume production lines while maintaining 80,000 psi tensile strength for critical structural applications.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent, precision threading. Dimensions include a 4-40 thread size, 3/16" length, and 0.516" flange diameter. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B85, it meets industry specifications for mechanical performance. 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 approved for use in regulated markets.