S-95560A101 4-40 x 3/8" Stainless Steel Oversized-Flange Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Enhanced durability and load distribution from the integrated flange design, reducing surface pressure and preventing loosening
• High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance under stress
• Precise, secure fastening ensured by Class 2A thread fit and coarse UNC threads for quick assembly and vibration resistance
• Easy installation and removal with 1/16" hex drive, providing excellent torque transmission in confined spaces
• Full thread engagement along the 3/8" length for maximum grip strength and uniform clamping force
• Regulatory compliance and safety meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This 316 stainless steel flanged rounded head screw is engineered to address critical challenges in demanding industrial settings. The corrosion-resistant 316 alloy provides exceptional protection against chlorides, acids, and extreme temperatures, making it ideal for chemical processing, marine equipment, and food-grade applications. The flanged button head design eliminates the need for separate washers, distributing clamp load over a wider area to prevent surface damage and maintain joint integrity under vibration. Combined with 4-40 UNC coarse threads and Class 2A fit, this screw ensures rapid assembly with consistent torque values while resisting loosening in high-stress environments. The fully threaded 3/8" length and 1/16" hex drive provide superior accessibility in tight spaces, reducing installation time and improving maintenance efficiency across machinery, electronics, and structural assemblies.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNC standards with 4-40 coarse threads and right-hand threading. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety. Dimensions include 3/8" length, 0.112" thread diameter, and 0.344" flange diameter, providing consistent performance for industrial applications requiring precise mechanical fastening.