S-95599A139 1/4"-20 x 1" 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 industrial environments and reducing maintenance costs.
• Superior holding power and reliability from a fully threaded design and 80,000 psi tensile strength, minimizing the risk of fastener failure under load.
• Effortless installation and removal using a standard 5/32" hex drive, saving time and labor during assembly and disassembly.
• Enhanced load distribution and stability provided by the integrated flange, preventing pull-through and securing components more effectively.
• Wide rounded button head profile offers a low-profile, finished appearance while reducing surface damage and snagging risks.
• Precise and reliable thread engagement with UNC coarse threading and Class 2A fit, ensuring consistent performance and interchangeability.
• Compliance with environmental and safety standards including RoHS 3 and REACH, supporting sustainable and responsible manufacturing practices.

Professional Applications & Engineering Value

This 18-8 Stainless Steel flanged rounded head screw is engineered to address common industrial fastening challenges, such as vibration loosening and corrosion-induced failure. The UNC coarse thread and Class 2A fit provide excellent engagement in a variety of materials, reducing cross-threading risks and ensuring reliable performance in high-stress applications like machinery assembly, automotive components, and outdoor equipment. The flanged design eliminates the need for separate washers, streamlining installation and enhancing clamp load distribution. Combined with the Rockwell B85 hardness and 80,000 psi tensile strength, this screw delivers long-term durability and resistance to wear, making it a cost-effective solution for demanding environments where reliability and compliance with RoHS and REACH standards are critical.

Specification Summary & Compliance

This screw adheres to UNC thread standards with a Class 2A fit for consistent dimensional accuracy and interchangeability. Key specifications include a 1/4"-20 thread size, 1" length, 5/32" hex drive, and fully threaded design. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.