The MS51959-45 is an aerospace-standard machine screw with a flat countersunk head, used in aircraft assemblies where a flush surface finish, reliable fastening, and vibration resistance are required. It is designed for installation in countersunk holes, allowing the head to sit flush with the surface for aerodynamic and clean panel applications.

This screw is commonly used in aircraft interior panels, fairings, access covers, and light structural components. It features a #8-32 UNF thread and a 1/2 inch length, making it suitable for small-to-medium fastening points in general aviation and aerospace systems.

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

Key features include:

MS51959-45 aerospace machine screw
Flat countersunk head (82°) for flush installation
#8-32 UNF thread, 1/2" length
Stainless steel corrosion-resistant construction
Phillips/cross-recess drive
Used in airframe, panels, and interior assemblies
Suitable for vibration and cyclic load environments
Direct replacement per MS aircraft hardware standards