The MS51959-4 is a military standard Phillips flat head machine screw manufactured for aerospace applications requiring a reliable, flush-mounted fastening solution. Produced in accordance with the MS51959 specification, this screw is widely used throughout commercial, military, and general aviation aircraft for securing panels, inspection covers, avionics equipment, fairings, and other structural or interior components.

Featuring an 82° countersunk flat head, the screw sits flush with the mating surface when installed in a properly countersunk hole, helping maintain aerodynamic surfaces and preventing interference with adjacent components. The Phillips recess allows for efficient installation and removal using standard aerospace maintenance tools while providing dependable torque transmission.

Manufactured from corrosion-resistant stainless steel, the MS51959-4 offers excellent mechanical strength and long-term resistance to corrosion in demanding aircraft environments. Its precision-machined threads ensure secure engagement and consistent clamping force, making it suitable for repeated maintenance and inspection procedures.

As an OEM-standard aerospace fastener, the MS51959-4 is designed to deliver dependable fastening performance while supporting the structural integrity and serviceability of aircraft assemblies when installed in accordance with approved maintenance practices.

Key Features

- Part Number: MS51959-4
- Manufacturer: Military Standard (MS)
- Component: Phillips Flat Head Machine Screw
- Head Style: 82° Flat Countersunk
- Drive Type: Phillips
- Material: Corrosion-Resistant Stainless Steel
- Construction: Precision-machined aerospace fastener
- Application: Aircraft panels, fairings, avionics, inspection covers, and general aerospace assemblies
- Features: Flush installation, corrosion resistance, and reliable mechanical fastening