The MS51959-43 is a military-standard machine screw with a flat countersunk head, designed for aerospace applications where flush mounting, lightweight construction, and vibration resistance are required. The 82° countersunk head allows the screw to sit flush with the surface, making it ideal for aerodynamic surfaces and finished interior panels.

This screw is commonly used in aircraft interior structures, fairings, access panels, and light airframe assemblies. It provides secure fastening in low-to-medium load applications where space is limited and a smooth surface profile is required.

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

Key features include:

MS51959-43 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 tools
Used in aircraft panels, fairings, and interiors
Suitable for vibration and cyclic load environments
Lightweight aerospace fastener
Direct replacement per MS aircraft hardware standards