CM Extension Cords | McMaster-Carr

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24 Products

About Wire and Cable

Unshielded

Shielded

Double Shielded

Use For:
Unshielded: Data; Category 3 can also be used for Telephones
Shielded, Double Shielded: Data, Interference Shielding
Flexible
Insulation:
Outer: PVC Plastic
Inner: See table

Send data between computers, printers, servers, and switches. Ethernet category standards describe the cable’s performance capabilities. Higher category numbers mean faster speeds, superior data transfer, and better signal strength. Category cables are backward compatible, so you can mix and match, but your speed will only be as fast as the lowest-rated cable.

Unshielded cable is the choice for day-to-day wiring, such as connecting your desktop computer to an ethernet port.

Shielded cable has a layer of foil that blocks signal interference from nearby equipment, such as variable frequency drives or small motors. It has an uninsulated ground wire that is not counted in the number of wires.

Double-shielded cable has a layer of braid and foil shielding for the best protection against signal interference. Use it in areas with high signal distortion, such as near transformers, generators, and heavy duty motors.

CM and CMR cable prevent the spread of flames down the length of the cable. CMR is more flame resistant than CM cable.

								Inner Insulation					Per Ft.
Ethernet Cable Category	Transmission Frequency	Wire Ga.	No. of Wires	Cable AWG	Max. Temp., °F	OD	Industry Designation	Material	Color	Choose an Outer Insulation Color	Length, ft.		1-499	500-Up
Unshielded Solid Wire
5E	100 MHz	24	8	24/8	165°	0.21"	CM	Polyolefin Plastic	Blue Blue/White Brown Brown/White Green Green/White Orange Orange/White	Blue, Gray, White, Yellow	25, 50, 100, 500, 1,000	0000000	00000	00000
Shielded Stranded Wire with Uninsulated Ground Wire
5E	100 MHz	26	8	26/8	140°	0.22"	CM	Polyethylene Plastic	Blue Blue/White Brown Brown/White Green Green/White Orange Orange/White	White	25, 50, 100, 500, 1,000	0000000	000	000
Double-Shielded Solid Wire
8	2,000 MHz	23	8	23/8	165°	0.32"	CM	Polyethylene Plastic	Blue Blue/White Brown Brown/White Green Green/White Orange Orange/White	Blue	10, 25, 50, 100, 300	0000000	0000	0000

Twisted-Pair Data Communication Cable

Use For: Data, Interference Shielding
Flexible
Temperature Range: 0° to 165° F
Insulation: PVC Plastic

This cable has twisted pairs of wires that cancel signal interference from multiple transmission lines, as well as foil and braid shielding over the entire cable. It's often used to transmit data in high speed computers near variable-frequency drive motors, where voltage fluctuations and current spikes can distort signals. The industry designation is CM and CMG, so it’s approved for in-wall installation and has flame-resistant insulation. The uninsulated ground wire is not counted in the number of wires.

											Per Ft.
Wire Ga.	No. of Wires	Cable AWG	Transmission Speed, Mbps	Capacitance per Foot	OD	Industry Designation	Outer Insulation Color	Features	Length, ft.		1-99	100-Up
Double-Shielded Stranded Wire
300V AC
24	4	24/4	10	12.5 pF	0.27"	CM, CMG	Gray	Uninsulated Ground Wire	10, 25, 50, 100, 500	00000000	00000	00000
24	6	24/6	10	12.5 pF	0.28"	CM, CMG	Gray	Uninsulated Ground Wire	10, 25, 50, 100, 500	00000000	0000	0000
24	10	24/10	10	12.5 pF	0.33"	CM, CMG	Gray	Uninsulated Ground Wire	10, 25, 50, 100, 500	00000000	0000	0000
24	25	24/25	10	12.5 pF	0.48"	CM, CMG	Gray	Uninsulated Ground Wire	10, 25, 50, 100, 500	00000000	0000	0000

Data Communication Cable

Use For: Data, Interference Shielding
Flexible
Outer Insulation: PVC Plastic

Connect computers, CNC machines, and other equipment that requires complex data and signal transmission. This double-shielded cable has both braid and foil for the highest level of protection against signal interference. Use it in areas with high signal distortion, such as near transformers, generators, and motors. This CM-designated cable is flame rated for general purpose applications, such as in-wall installation or use between equipment on shop floors. It’s also rated VW-1 to keep fire from spreading. This cable has an uninsulated ground wire that is not counted in the number of wires.

														Per Ft.
Wire Ga.	No. of Wires	Cable AWG	Transmission Speed, Mbps	Capacitance per Foot	Temp. Range, °F	OD	Industry Designation	Outer Insulation Color	Inner Insulation Color	Features	Specifications Met	Length, ft.		1-99	100-Up
Double-Shielded Stranded Wire
300V AC
24	3	24/3	10	12.5 pF	0° to 165°	0.22"	CM	Gray	Black, Green, Red	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 500	00000000	00000	00000
24	4	24/4	10	12.5 pF	0° to 165°	0.23"	CM	Gray	Black, Green, Red, White	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 200, 500	00000000	0000	000
24	6	24/6	10	12.5 pF	0° to 165°	0.27"	CM	Gray	Black, Blue, Brown, Green, Red, White	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 500	00000000	0000	0000
24	8	24/8	10	12.5 pF	0° to 165°	0.28"	CM	Gray	Black, Blue, Brown, Green, Orange, Red, White, Yellow	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 500	00000000	0000	0000
24	10	24/10	10	12.5 pF	0° to 165°	0.31"	CM	Gray	Black, Blue, Brown, Gray, Green, Orange, Purple, Red, White, Yellow	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 500	00000000	0000	0000
24	15	24/15	10	12.5 pF	0° to 165°	0.35"	CM	Gray	Black, Black/White, Blue, Blue/Black, Blue/White, Green, Green/Black, Green/White, Orange, Orange/Black, Red, Red/Black, Red/White, White, White/Black	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 500	00000000	0000	0000
24	25	24/25	10	12.5 pF	0° to 165°	0.4"	CM	Gray	Black, Black/Red, Black/White, Black/White/Red, Blue, Blue/Black, Blue/Red, Blue/White, Green, Green/Black, Green/Black/White, Green/White, Orange, Orange/Black, Orange/Green, Orange/Red, Red, Red/Black, Red/Black/White, Red/Green, Red/White, White, White/Black, White/Black/Red, White/Red	Uninsulated Ground Wire	NEC Article 800, UL 2556 VW-1	10, 25, 50, 100, 500	00000000	0000	0000

Communication and Security System Cable

Often used for intercoms, speakers, and security systems, this cable is designated as CM and CL2 or CMG, so the insulation is flame resistant and approved for in-wall installation in single-level facilities.

Use unshielded cable in applications where signal interference is not a concern.

Shielded cable has a layer of foil that blocks signal interference from nearby equipment and devices. It has an uninsulated ground wire is not counted in the number of wires.

Unshielded Stranded Wire

Unshielded

Use For: Buildings
Flexible
Temperature Range: 0° to 140° F
Insulation: PVC Plastic

300V AC/300V DC
Wire Ga.	No. of Wires	Cable AWG	OD	Outer Insulation Color	Inner Insulation Color	Industry Designation	Specifications Met		10 ft.	25 ft.	50 ft.	100 ft.	250 ft.
22	2	22/2	0.11"	Gray	Black, Red	CM, CL2	ETL Listed, C-ETL Listed	0000000	00000	00000	000000	000000	000000
22	4	22/4	0.13"	Gray	Black, Green, Red, White	CM, CL2	ETL Listed, C-ETL Listed	0000000	0000	00000	00000	00000	00000

Shielded Stranded Wire

Shielded

Use For: Buildings, Interference Shielding
Flexible
Temperature Range: See table
Insulation: PVC Plastic

											Per Ft.
Wire Ga.	No. of Wires	Cable AWG	Temp. Range, °F	OD	Outer Insulation Color	Inner Insulation Color	Features	Industry Designation	Length, ft.		1-99	100-Up
300V AC/300V DC
24	2	24/2	0° to 165°	0.16"	Gray	Black, Red	Uninsulated Ground Wire	CM, CMG	10, 25, 50, 100, 200, 500	00000000	00000	00000
24	3	24/3	0° to 165°	0.16"	Gray	Black, Green, Red	Uninsulated Ground Wire	CM, CMG	10, 25, 50, 100, 200, 500	00000000	000	000
24	4	24/4	0° to 165°	0.18"	Gray	Black, Green, Red, White	Uninsulated Ground Wire	CM, CMG	10, 25, 50, 100, 200, 500	00000000	000	000
24	6	24/6	0° to 175°	0.21"	Gray	Black, Blue, Brown, Green, Red, White	Uninsulated Ground Wire	CM, CMG	10, 25, 50, 100, 200, 500	00000000	000	000
24	8	24/8	0° to 175°	0.22"	Gray	Black, Blue, Brown, Green, Orange, Red, White, Yellow	Uninsulated Ground Wire	CM, CMG	10, 25, 50, 100, 500, 1,000	00000000	000	000
24	10	24/10	0° to 175°	0.25"	Gray	Black, Blue, Brown, Gray, Green, Orange, Purple, Red, White, Yellow	Uninsulated Ground Wire	CM, CMG	10, 20, 25, 50, 100, 500	00000000	000	000
24	15	24/15	0° to 165°	0.27"	Gray	Black, Black/White, Blue, Blue/Black, Blue/White, Green, Green/Black, Green/White, Orange, Orange/Black, Red, Red/Black, Red/White, White, White/Black	Uninsulated Ground Wire	CM, CMG	10, 20, 25, 50, 100, 500	00000000	0000	0000
24	25	24/25	0° to 175°	0.37"	Gray	Black, Black/Red, Black/White, Black/White/Red, Blue, Blue/Black, Blue/Red, Blue/White, Green, Green/Black, Green/Black/White, Green/White, Orange, Orange/Black, Orange/Green, Orange/Red, Red, Red/Black, Red/Black/White, Red/Green, Red/White, White, White/Black, White/Black/Red, White/Red	Uninsulated Ground Wire	CM, CMG	10, 20, 25, 50, 100, 500	00000000	0000	0000