S-95861A111 4-40 x 3/16" Venting Stainless Steel 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 and reducing replacement frequency.
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B81 hardness for reliable performance under high stress.
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse thread spacing, minimizing loosening in vibrating applications.
• Efficient installation and removal with the 1/16" hex drive, providing a firm grip and reducing tool slippage.
• Enhanced pressure equalization through the vented design with a 0.044" vent diameter, preventing pressure buildup in sealed assemblies.
• Fully threaded shank for maximum grip along the entire length, improving load distribution and joint integrity.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This 4-40 UNC threaded screw with a rounded button head and 18-8 stainless steel material is engineered to address common industrial challenges such as corrosion, vibration-induced loosening, and pressure differentials. The coarse thread spacing and Class 3A thread fit provide excellent holding power in materials like metals and plastics, reducing maintenance needs in machinery, electronics, and automotive assemblies. The hex drive ensures quick, secure fastening with standard tools, while the vented feature allows for air or fluid pressure equalization, critical in enclosed systems. Its high tensile strength and Rockwell B81 hardness make it suitable for demanding applications where durability and reliability are paramount, supporting long-term operational efficiency.

Specification Summary & Compliance

This screw adheres to inch system measurements with precise dimensions: 3/16" length, 0.112" thread diameter, and 0.213" head diameter. It features UNC coarse threads with a Class 3A thread fit for tight tolerances, right-hand thread direction, and fully threaded design. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.