The MS51959-27 is a military-standard machine screw with an 82° countersunk flat head, designed for aerospace applications requiring flush mounting, lightweight construction, and reliable fastening performance. The countersunk head allows the screw to sit level with the surface, providing a smooth aerodynamic finish.

This fastener is commonly used in aircraft interior panels, fairings, access covers, and light structural components where vibration resistance and space efficiency are important. It ensures secure fastening while maintaining a clean, unobstructed surface profile suitable for aviation applications.

Manufactured to MS specifications, it is typically made from corrosion-resistant stainless steel (18-8 / 300-series) with a passivated finish, ensuring durability in environments exposed to moisture, vibration, and temperature variations.

Key features include:

MS51959-27 aerospace machine screw
82° flat countersunk head (flush mount)
#6-32 UNF thread
Stainless steel (18-8 / 300-series) construction
Passivated corrosion-resistant finish
Phillips drive for standard tools
Used in aircraft interiors, panels, and fairings
Suitable for vibration and cyclic load environments
Lightweight aerospace fastener
Direct replacement per MS aircraft hardware standards