MS51958-68 - Aerospace Machine Screw

MS51958-68 – Aerospace Machine Screw

Available now on the Airparts.aero Marketplace.

Overview

The MS51958-68 is a military-standard pan head machine screw engineered for general-purpose fastening in a wide variety of aerospace applications. Manufactured in accordance with the strict MS51958 specification, this screw is fabricated from high-quality, corrosion-resistant stainless steel. Its versatile pan head and fine thread pitch make it a durable and reliable choice for non-structural attachments, including the installation of instruments, avionics, interior components, and various system hardware throughout an airframe.

Key Features

• Corrosion-Resistant Steel: Fabricated from 300-series stainless steel, providing excellent inherent resistance to rust and corrosion without the need for plating. This makes it ideal for long-term installations in diverse atmospheric conditions.
• Pan Head Design: Features a low-profile pan head with a flat bearing surface, which combines a clean, finished appearance with a good clamping area. This design is highly versatile for securing a wide range of components.
• Fine Thread Series (UNF): The 10-32 UNF thread provides a higher tensile stress area and greater resistance to loosening under vibration compared to coarse-threaded screws, making it a more secure choice for aviation applications.
• MS Certified Quality: As a certified Military Standard part, the MS51958-68 guarantees full material traceability, dimensional accuracy, and quality control, ensuring it meets the stringent requirements for use in certified aircraft.
• Cross-Recess Drive: Equipped with a standard Phillips (cross-recess) drive for straightforward installation and removal using common aviation-grade tools, allowing for consistent torque application.

Technical Specifications

• Standard: MS51958 (Screw, Machine, Pan Head, Cross-Recessed, Corrosion-Resistant Steel, UNF)
• Full Part Number: MS51958-68
• Material: 300-Series Stainless Steel
• Finish: Passivated (cleaned and descaled per AMS-QQ-P-35)
• Head Style: Pan Head
• Drive Type: Phillips / Cross-Recess Type I
• Thread Specification: 10-32 UNF-2A
  • Nominal Diameter: #10 (0.190 inches)
  • Threads Per Inch: 32 (Fine Thread)
• Length: 1-1/4 inches (1.250 inches), measured from under the head.
• Minimum Tensile Strength: Approximately 80,000 PSI

Aircraft Compatibility

The MS51958-68 is a universal, non-structural fastener used across virtually all types of aircraft, from general aviation to commercial and military platforms. Its use is specified by manufacturers wherever a durable, corrosion-resistant pan head screw of this size is required.

• Common Applications:
  • Avionics & Instrument Installation: Securing instrument panels, avionics trays, and individual gauges.
  • Interior & Trim: Fastening cabin interior panels, placards, upholstery, and trim pieces.
  • Systems & Fairings: Attaching light-duty access panels, fairings, and system line clamps (adel clamps).

Applications

The MS51958-68 is the ideal fastener for a multitude of general-purpose aerospace tasks:

• Non-Structural Joints: Designed for fastening components where the extreme strength of a structural bolt is not required, but quality and corrosion resistance are essential.
• Serviceable Components: The Phillips drive facilitates easy installation and removal, making it perfect for securing components that require periodic maintenance or inspection.
• General Assembly: A reliable, high-quality choice for countless minor assemblies where a certified fastener is necessary to maintain airworthiness.

Why Choose MS51958-68?

Maintaining the airworthiness of an aircraft requires that every piece of hardware, no matter how small, meets a certified standard. Using a genuine MS51958-68 screw guarantees you are installing a fastener made from the correct corrosion-resistant material with traceable quality control. Substituting with uncertified commercial-grade hardware can introduce the risk of corrosion, material failure due to vibration, and improper fit. For a professional and airworthy repair, even on non-structural components, relying on certified MS hardware is the only safe and correct choice.

Order Your MS51958-68 Screws Now

Stock your workshop with the certified, high-quality hardware essential for professional aviation maintenance. Visit Airparts.aero to order your MS51958-68 stainless steel pan head screws today.

The Military Standard MS51958 specification is dedicated to a series of corrosion-resisting steel, fine-thread (UNF) pan head screws. The choice of 300-series stainless steel provides a "passive" corrosion resistance, where a thin, inert layer of chromium oxide forms on the surface, protecting the underlying steel from the environment. This is often preferred over plated carbon steel screws in areas where the plating could be scratched or compromised. The UNF (Unified National Fine) thread series provides a larger tensile stress area and a smaller thread helix angle than coarse threads, which increases its resistance to loosening under the high-frequency vibrations common in aircraft structures.

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.

Additional Specification Information

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