Raychem Spec 44 vs M27500 | Product Knockout

“Our Product Knock-out series is a match-up between two similar products. In boxing terms, think same weight class, same caliber, and same level of experience and amount of exposure. The purpose of these posts are for you to see a side-by-side view of two similar products, and to be able to understand which one will be crowned champ for your specific purposes. Take your seats and prepare for battle, because the gloves are coming out.”

Tyco Raychem Spec 44 and M27500 are both cables used in military and aerospace applications. They are both designed for work in the most challenging and demanding conditions possible, while still providing consistent, reliable performance. Let’s take a closer look at these two products, and see how they stack up against one another.

What is Raychem Spec 44 cable?

Tyco Raychem Spec 44 was originally designed for military and aerospace applications. Spec 44 wire is used in a variety of different industries, such as aircraft, commercial and military electronics, helicopters, satellites, ships, and trains. It offers dual wall construction which combines the outstanding physical and electrical characteristics of radiation crosslinked polyalkene with the excellent mechanical and chemical properties of radiation cross-linked polyvinylidene fluoride (PVDF). Raychem Spec 44 is also highly flame retardant, non-melting, and easy to handle and install using conventional tools. In addition, it has a temperature rating of -65°C to +150°C with a voltage rating of 600 volts.

What is M27500 cable?

M27500 falls into the category of Mil Spec cable, meaning that it is military specific. Just like Raychem Spec 44, M27500 is also used in a variety of both military and commercial applications, including airframes, avionics, and ground support equipment. M27500 cable can also be manufactured to perform in almost every environment. It is insulated with cross-linked extruded Polyalkene (XL-PVDF), featuring a stranded tinned coated copper conductor. It offers a max temperature rating of 150°C with a voltage rating of 600 volts.

Construction and Electrical Specs

Raychem Spec 44 M27500
Conductor Silver-coated copper Stranded Tinned Coated Copper
Insulation Radiation-crosslinked, extruded polyalkene Cross-linked extruded Polyalkene (XL-PVDF)
Shield N/A Tinned Copper Braid, 85% Coverage
Jacket  Radiation-crosslinked, modified PVDF Extruded Cross-linked Polyalkene (XL-PVDF)
Min Temperature Rating -65°C -65°C
Max Temperature Rating 150°C 150°C
Voltage 600 600

Raychem Spec 44 vs M27500

There is a lot of overlap when it comes to Raychem and M27500 cables. They are used in similar industries and applications, have the same temperature and voltage ratings, and can withstand challenging environmental conditions. That being said, they do have a few differences in their construction. The M27500 cable has a tin copper braided shield while the Raychem Spec 44 doesn’t have a shield. The braided shield provides a low-resistance path to ground and high conductivity. They also have different jacket materials, with the Raychem Spec 44’s
being radiation-crosslinked, modified PVDF and the M27500’s Extruded Cross-linked Polyalkene (XL-PVDF). In this case, there is no clear winner between the products, and instead, it seems as if the match has ended in a technical decision. In this case it looks like our crowned
champ depends on your specific application use.

If you’re unsure if Raychem Spec 44 or M27500 would work best for your wire and cable needs, let Allied help you out! Compare full Raychem and M27500 specs or give your sales rep a call at 800-472-5655 with any questions.

Allied Encyclopedia: M55021 Cable

M55021 cable is mil-spec electrical cable intended for use in the internal wiring of electrical equipment.

Until July 2011, M55021 cable was regulated according to the Mil-C-55021 spec, but that has been superseded by the MIL-DTL-55021 specification and, most recently, the ANSI/NEMA WC 55021-2013 standard. M55021 is still commonly called out by the older mil-spec names after many years in use.

M55021 cable is available in a variety of constructions, including twisted pairs and triples, which can be any combination of shielded or unshielded and jacketed or unjacketed. Singles, however, must be shielded, but jacketing is optional.


M55021 Cable

Depending on the jacket material, M55021 cable can be used in temperatures ranging from -40°C to 105°C for PVC and Polyamide jacketed cables, or -65°C to 200 °C for PTFE and FEP jacketed cables. Keep in mind that Polyvinylchloride (PVC) insulation or jacketing should not be used for aerospace applications.

If you had no prior knowledge of M55021 and only had the cable in front of you, you would still be able to figure out a lot about the cable if you know how to break down the part number. A typical M55021 part number looks like:


Typical M55021 cable part number

This part number can be broken down into six sections:

  • Wire Type – “Wire type” refers to the basis of the cable’s construction. The inner components of M55021 are built to M16878 specs (or newer NEMA HP3 standards), and knowing which type of M16878 wire is inside will give you more information on your specific M55021 cable. These types range from M16878/1 to M16878/5 and M16878/17 to M16878/19, and are identified in the part number by letter symbols.

Here are the letter combinations and the corresponding M16878 wire:

Letter Wire Specification Letter Wire Specification
B M16878/1 EE NEMA HP3 (M16878/5)
C M16878/2 BJ M16878/17
D M16878/3 CJ M16878/18
E NEMA HP3 (M16878/4) DJ M16878/19
  • Conductor Size – This number identifies the AWG size of the wires in this cable. This table shows the conductor sizes and stranding available for M55021:
Conductor Size Stranding
26 AWG – 30 AWG 7 Strands
12 AWG – 24 AWG 19 Strands
10 AWG 37 Strands
  • Conductor Material -Therearethreeletteroptionstoidentify the conductor material:
    • C” for Copper
    • S” for Copper Clad Steel
    • H” for High Strength Copper Alloy
  • Color Code – The first number to appear is the base color of the wire, and the second and third indicate stripes. Two groups of numbers indicate a twisted pair and three groups indicate a twisted triple. The color code designators for wires 2 and 3 of a twisted pair and triplet are separated by a dash, but for single shielded and single shielded and jacketed constructions, a dash would not be present in the part number.

Here are the color codes:

Code Color Code Color
0 Black 5 Green
1 Brown 6 Blue
2 Red 7 Violet
3 Orange 8 Gray
4 Yellow 9 White
  • Covering over Components – The covering refers to the shielding and jacket materials. M55021 shields consist of a braid made with the same material as the one used for the conductors. The covering can be identified by either one, two, or three-lettered symbols:
Letter Covering Letter Covering
U Unjacketed and unshielded S Shielded and unjacketed
P Polyvinylchloride (PVC) Jacket SP Shielded and covered with PVC Jacket
F Fluorinated Ethylene Propylene (FEP) Jacket SF Shielded and covered with FEP Jacket
J Polyamide Jacket SJ Shielded and covered with Polyamide Jacket
T Polytetrafluoroethylene (PTFE) Jacket STW Shielded and covered with wrapped PTFE Jacket
STX Shielded and covered with extruded PTFE Jacket
  • Identification Method – This cable can be identified by marking intervals of 1 to 3 feet on the outer jacket of the cable or by marker tape placed under the shield or jacket of any of the wires for unjacketed cables. Print will indicate Military Specification number, manufacturer’s CAGE number, type of designation, and the year of manufacture.

For example, let’s break down E24C904-903-9STW:

E” – wire type is NEMA HP3 (M16878/4)

24” – 24 conductors in the cable

C” – Copper conductor

904” – First wire base color is white, first stripe is black, and second stripe is yellow

903” – Second wire base color is white, first stripe is black, and second stripe is orange

9” – Third wire base color is white

STW” – Shield consists of a braid made with the same material used for the conductors and tape wrapped in a PTFE jacket

Since you’re a pro at breaking down M55021 part numbers now, it should be easy to identify the cable’s contents right away! Knowing how to read the part number will aid in choosing the correct wire for your use. Visit Allied’s MIL-C-55021 cable part number builder to create the wire you need and request a quote!

Allied Encyclopedia: All About M27072 Cable

Allied EncyclopediaM27072 cable is a special purpose mil-spec wire for use in protected installations, such as in racks and tunnels, or inside buildings, trailers, or other military equipment. It is an electrical multi-conductor, single shielded cable. (Note: M27072 cables featuring polyvinyl chloride (PVC) are not to be used for aerospace applications.)
Conveniently, individual M27072 part numbers give a lot of information about the cables. Each number and letter symbolizes a characteristic, and if you understand how they’re broken down, you can make an educated decision about which M27072 cable is right for your application.

Here is what an M27072 part number can tell you:

  • Part Identification Number (PIN) and Specification Sheet Number Each part number begins with “M27072” which means it is from the same family of cable and meets MIL-DTL-27072 standards. The number after the slash is the detail specific sheet number, also referred to as the “slant sheet.”
  • Basic Wire Size and Stranding – The first letter after the spec sheet number represents a specific combination of the gauge of the conductor, the number of strands, and the gauge of each strand that the basic wires, also called the “inners,” must comply with. There are 9 different letter possibilities: D, F, G, H, J, K, L, M and S. Gauges range from 12 AWG through 26 AWG.
  • Basic Wire Specification – The next letter determines the type of wire used as the cable’s inners. There are five different possibilities: A, B, D, E, and P, and each letter stands for a specific version of MIL-DTL-16878, SAE-AS22759 or NEMA HP3 wire.
  • Shield and Jacket Material – This letter identifies whether the cable is shielded and jacketed, and if so, what type of materials are used. (Note: The MIL-DTL-27072 specification refers to “undershield material” as the jacket. The outside layer of the cable is referred to as the sheath.) Shielded cables can feature round tinned copper or silver-coated copper shields, and jacketed cables are available in Polyamide or PVC.
  • Sheath Material – This letter determines what material the sheath, the outermost layer of this cable, is made from. There are four options: A – Polyvinyl Chloride (PVC), B – Polyethylene (PE), D – Fluorinated ethylene propylene (FEP), and E – Polytetrafluoroethylene (PTFE).
  • Sheath Color – This final letter determines what color the sheath is, and if there are any stripes or bands on the wire. There are a total of 30 different possibilities for solid colors or color combinations.

Let’s take a closer look at the breakdown for M27072/76 FADA9:

  • M27072/76: general specification number, and detail specification number
  • F: The basic conductor size is 16 AWG, each conductor has 19 strands, and each strand is 29 AWG
  • A: The basic cable meets MIL-DTL-16878/17 military specifications.
  • D: Features a polyamide jacket and silver-coated copper shield
  • A: The sheath is made of Polyvinyl chloride (PVC)
  • 9: This wire is white with no stripes or bands

Breaking down part numbers and looking at each characteristic can be extremely helpful when searching for the correct type of wire. To learn more, check out our large selection of MIL-DTL-27072 cables.

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