MS35206-218 – Aerospace Screw
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Overview
The MS35206-218 is a military-standard machine screw designed for general-purpose, non-structural applications throughout an aircraft. Manufactured in accordance with the MS35206 specification, this fastener is a versatile workhorse for securing a wide variety of components, from instrument panels to light-duty fairings. It features a pan head for a low profile and good bearing surface, and it is fabricated from quality carbon steel with a protective cadmium plating for corrosion resistance. As a certified MS part, it provides a known level of quality and traceability for all non-structural fastening needs.
Key Features
- Pan Head Design: Features a versatile, low-profile pan head with a flat bearing surface. This design offers a clean appearance and provides good clamping force without the height of a washer or truss head, making it suitable for a wide range of applications.
- Carbon Steel Construction: Fabricated from a reliable carbon steel alloy, providing good strength for non-structural attachments and general-purpose fastening.
- Corrosion-Resistant Plating: Plated with a cadmium and chromate finish per specification QQ-P-416, Type II, Class 3. This plating offers excellent protection against corrosion, ensuring the fastener's longevity and reliability in the aviation environment.
- MS Certified Standard: As a certified Military Standard component, the MS35206-218 guarantees that the material, dimensions, thread quality, and finish meet the stringent requirements for use in certified aircraft.
- Cross-Recess Drive: Features a standard Phillips (cross-recess) drive, which allows for consistent torque application and ease of installation with common aviation-grade tools.
Technical Specifications
- Standard: MS35206 (Screw, Machine, Pan Head, Cross-Recessed)
- Full Part Number: MS35206-218
- Material: Carbon Steel
- Finish: Cadmium Plated, Type II, Class 3
- Head Style: Pan Head
- Drive Type: Phillips / Cross-Recess Type I
- Thread Specification: 4-40 UNC-2A
- Nominal Diameter: #4 (0.112 inches)
- Threads Per Inch: 40 (Coarse Thread)
- Length: 5/8 inch (0.625 inches), measured from under the head.
- Minimum Tensile Strength: Approximately 55,000 - 60,000 PSI
Aircraft Compatibility
The MS35206-218 is a universal, non-structural fastener used across virtually all types of aircraft, from general aviation pistons to commercial and military jets. Its use is specified by manufacturers wherever a standard-duty pan head machine screw of this size is required.
- Common Applications:
- Instrument Panel Assembly: Securing gauges, bezels, and modular instrument components.
- Avionics Installation: Fastening avionics faceplates, trays, and connector brackets.
- Interior Panels: Mounting light-duty interior panels, placards, and furnishings.
- System Brackets & Clamps: Attaching various system line clamps (adel clamps) and light-duty support brackets to the airframe structure.
Applications
The MS35206-218 is the correct choice for a wide variety of general-purpose fastening jobs:
- Non-Structural Joints: Designed for fastening components where high shear or tensile strength is not a primary concern.
- Serviceable Panels: The Phillips drive allows for easy removal and reinstallation of panels and components during routine maintenance.
- General Assembly: A go-to fastener for countless minor assemblies throughout the airframe where a certified, quality screw is needed.
Why Choose MS35206-218?
While not a "structural" screw, the quality and traceability of every piece of hardware on an aircraft are essential for airworthiness. Using a genuine MS35206-218 ensures you are installing a fastener with a certified material, a protective plating designed for aviation environments, and dimensional consistency. Substituting with uncertified, commercial-grade hardware can introduce risks of premature corrosion, material failure from vibration, or improper fit. For a professional and airworthy repair, even on non-structural components, relying on certified MS hardware is the correct and safe choice.
Order Your MS35206-218 Screws Now
Stock your shop with the certified, reliable hardware required for professional aviation maintenance. Visit Airparts.aero to order your MS35206-218 pan head screws today.
The Military Standard MS35206 specification provides a highly reliable and versatile pan head machine screw for general aviation use. The pan head design offers a larger bearing surface than a round head and a lower profile than a truss head, providing a good compromise for clamping force and snag resistance. The UNC (Unified National Coarse) thread series is specified for its rapid assembly and robust nature, being less susceptible to cross-threading or damage in service environments compared to fine threads. This screw is often used as a direct, higher-quality replacement for the older AN515 (round head) series screw in many applications.
Note: Always verify the correct screw part number (including material, thread size, and length) from the applicable aircraft maintenance manual or Illustrated Parts Catalog (IPC). Using the correct size and type of fastener is critical for a safe and airworthy repair.
