The MS51959-16 is a military-standard machine screw with an 82° countersunk flat head, used in aerospace applications where flush mounting, low profile installation, and vibration-resistant fastening are required. The countersunk head allows the screw to sit level with the surface, providing a smooth finish suitable for aerodynamic and interior aircraft structures.

This screw is commonly used in aircraft interior panels, fairings, access covers, and light airframe assemblies where compact installation and a clean surface profile are important. It ensures secure fastening while minimizing protrusions that could interfere with adjacent components.

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:

MS51959-16 aerospace machine screw
82° flat countersunk head (flush mount)
#8-32 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