The MS51959-2 is a military-standard machine screw with an 82° countersunk flat head, designed for aerospace applications where a flush, smooth surface finish and secure fastening are required. Its countersunk design allows the head to sit level with the material surface, making it suitable for aerodynamic and interior aircraft installations.

This screw is commonly used in aircraft interior panels, fairings, access covers, and light structural assemblies where low profile installation and vibration resistance are important. It provides reliable fastening while maintaining a clean surface appearance.

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

Key features include:

MS51959-2 aerospace machine screw
82° flat countersunk head (flush mount)
#4-40 UNF thread
Stainless steel (18-8 / 300-series) construction
Passivated corrosion-resistant finish
Phillips drive for standard installation 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