The MS21207-8-8 is an aircraft-grade countersunk machine screw used in general aviation and aerospace assemblies where a flush surface finish is required. It belongs to the MS21207 series, which defines 100° countersunk Phillips machine screws intended for light structural, interior, and equipment mounting applications.

This specific configuration is typically a #8-32 UNF threaded screw with a 1/2 inch length, designed to sit flush in countersunk holes to reduce drag and prevent interference with adjacent components.

Key features include:

Military Standard: MS21207 series fastener
Thread: #8-32 UNF (fine thread)
Length: 1/2 inch (0.500")
Head: 100° countersunk flat head
Drive: Phillips
Material: corrosion-resistant steel (commonly cadmium plated or passivated depending on variant)
Designed for aircraft interior and light airframe applications
Provides flush installation for aerodynamic or clearance-sensitive areas
Used in panels, fairings, avionics, and non-heavy structural assemblies
Built for vibration resistance in aviation environments