Allied Encyclopedia: All About M24640 Cable

Allied EncyclopediaThe M24640 Cable Specification covers lightweight, low smoke, electrical cables suitable for use in Navy shipboard applications.  The M24640 Shipboard Cable is offered in a variety of constructions, including watertight, watertight with circuit integrity, and non-watertight and shielded or unshielded.  Parts are available with temperature ratings from -20° C to 105° C with a voltage rating up to 600 Volts, as specified in the MIL-DTL-24640C slant sheets.

Once you are able to break down the part numbers you can become an expert and learn almost all there is to know about these cables. M24640 part numbers can be broken down into five sections.

  1. Federal Specifications: Each part number begins with “M24640,” showing that the part follows MIL-DTL-24640C specifications.
  2. Specification Sheet Number: Every part number is followed by a backslash and number, indicating the cable’s slant sheet, where you can find detailed information such as the ratings and materials used for that particular construction.
  3. Dash Number: With each spec sheet, part numbers can become even more specific. The dash number follows the slant sheet number, and is a reference to a variation of the cable with very specific measurements and performance capabilities.  Most of the time, you should look for the slant sheet and the type of cable you are interested in, and then delve deeper into the dash numbers once you confirm that the main part specs meet your needs.  The conductors in this cable also come in 20 AWG or 26 AWG and can have anywhere from two conductors to multiple conductors.
  4. Armoring: “A” is for armored shipboard cable, and “U” is for unarmored cable.
  5. Shielding: “O” stands for overall shield, “D” is for double overall shield, and “N” is for not shielded or blank cable.

For instance, let’s break down M24640/1-01UN.  By looking at the part number, we can tell it follows the M24640 federal specification, its specification sheet number is 1 and the dash number is 01.  The U indicates that the cable is unarmored, and the N shows that the cable is unshielded.  Make sense?  Now you will know how to break down these cables to understand what they are made of.

M24640 Shipboard Cable is ideal for low power, lighting, control, communications, instrumentation, and electronic applications.

For more information on M24620, or to get a quote, visit our online cable catalog. Also, for more information on shipboard cable check out our encyclopedia.

About awcwire
Allied Wire & Cable is a value-added manufacturer and distributor of electrical wire and cable, tubing, and more. We are a family owned and operated company, serving a wide range of industries, including the military, automotive, aerospace, and telecommunications markets. Allied is headquartered in Collegeville, PA. Additional locations can be found across the US, in Phoenix, AZ; Bedford, NH; Pewaukee, WI; Rochester, NY, Tampa, FL; and Mt. Juliet, TN. For more information on Allied, visit our main website at

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