Metric Jacks | McMaster-Carr

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42 Products

Barrel-Style DC Connectors

Made with industry standard barrel-style ends, these connectors carry DC power between electronic devices and power supplies.

Housing Connection—Pair connectors that have the same type of housing connection. Push-in connectors are quick to connect and disconnect. Screw-together connectors take longer to connect, but are more secure. They’re good for preventing power loss if vibration might loosen the connection or the connector could get yanked out.

Wire Connection—Choose based on your application. Wire leads come ready to connect and don’t require any preparation. Screw-clamp terminals are easy to use; just insert the wire into the terminal and tighten the screw to clamp it in place. Solder connections are the most secure and permanent connection.

IP68-Rated Connectors—Create a sealed connection when the plug and socket, receptacle, or adapter are also IP68 rated. All are dust tight, even when there’s continuous airflow. They also withstand submersion in water for more than 30 minutes.

Receptacles—Mount them in a panel. Receptacles with an off (Normally Open) circuit position turn equipment on when you plug in a device. Receptacles with an on (Normally Closed) circuit position have an internal switch, or shunt, to transfer power from one component to another when you plug in a device. They’re often used with equipment that can run on either battery or wall power, switching off the battery connection when you plug into the wall. You can also use them to turn on a light inside the device when you plug it in.

Adapters—Convert to the right barrel size for your connection.

Push-In Plugs with Wire Leads

Straight Push-In Plug with Wire Leads

									Cable					Black
End ID, mm	End OD, mm	End Length, mm	Number of Poles	Voltage	Current, A	Wire Lead Gauge	OD, mm	Lg., ft.	OD, mm	Color	Cable Lead Lg., ft.	Housing Material	Temp. Range, °F		Each
2.1	5.5	12	2	48V DC	7	18	9.6	6	5.2	Black	5.9	Plastic	-40° to 175°	00000000	00000
2.1	5.5	12	2	48V DC	8.5	18	9.6	15	5.2	Black	14.9	Plastic	-10° to 175°	00000000	00000
2.5	5.5	12	2	48V DC	7	18	9.6	6	5.2	Black	5.9	Plastic	-40° to 175°	00000000	0000
2.5	5.5	12	2	48V DC	8	18	9.6	15	5.2	Black	14.9	Plastic	-10° to 175°	00000000	00000

Push-In Plugs with Screw-Clamp Terminals

Push-In Plug with Screw-Clamp Terminals

												Black
End ID, mm	End OD, mm	End Length, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	Lg., mm	Wd., mm	Ht., mm	Housing Material	Temp. Range, °F		Each
2.1	5.5	12	2	48V DC	8.5	24-18	44.6	11	11	Plastic	-10° to 155°	0000000	00000

Push-In Plugs with Solder Connection

Push-In Plug with Solder Connection

												Black
End ID, mm	End OD, mm	End Length, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	For Max. Cable OD, mm	OD, mm	Lg., mm	Housing Material	Temp. Range, °F		Each
1.3	3.5	9.5	2	12V DC	5	24, 22, 20, 18	4.5	9	44	Plastic	-10° to 140°	00000000	00000
2	5.5	24.7	2	24V DC	11	20	5.5	8.5	51.8	Rubber	-40° to 220°	0000000	00000
2.1	5.5	9.5	2	12V DC	5	24, 22, 20, 18	4.5	9	33.2	Plastic	-10° to 140°	00000000	0000
2.5	5.5	9.5	2	12V DC	5	24, 22, 20, 18	4.5	9	33.2	Plastic	-10° to 140°	00000000	0000

Screw-Together Plugs with Solder Connection

Screw-Together Plug with Solder Connection (Black)

Screw-Together Plug with Solder Connection (Red)

Black
End ID, mm	End OD, mm	End Length, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	For Max. Cable OD, mm	OD, mm	Lg., mm	Housing Material	Housing Thread Location	Temp. Range, °F		Each
2.1	5.5	9.5	2	24V DC	5	20	5.5	9.5	43.2	Plastic	Internal	-40° to 85°	0000000	00000
2.5	5.5	9.5	2	24V DC	5	20	5.5	9.5	43.2	Plastic	Internal	-40° to 85°	0000000	0000
Red
2.1	5.5	9.5	2	24V DC	5	20	5.5	9.5	43.2	Plastic	Internal	-40° to 85°	0000000	0000
2.5	5.5	9.5	2	24V DC	5	20	5.5	9.5	43.2	Plastic	Internal	-40° to 85°	0000000	0000

Screw-Together Plugs with Solder Connection

IP68-Rated
Screw-Together Plug
with Solder Connection

														Black
End ID, mm	End OD, mm	End Length, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	For Max. Cable OD, mm	OD, mm	Lg., mm	Housing Material	Housing Thread Location	Temp. Range, °F	Environmental Rating		Each
2	5.5	24.7	2	24V DC	11	20	3.8	12.7	63.3	Rubber	Internal	-40° to 220°	IP68	0000000	000000
2	5.5	24.7	2	24V DC	11	20	4.4	12.7	63.3	Rubber	Internal	-40° to 220°	IP68	0000000	00000
2	5.5	24.7	2	24V DC	11	20	5.3	12.7	63.3	Rubber	Internal	-40° to 220°	IP68	0000000	00000

Push-In Sockets with Wire Leads

Push-In Socket with Wire Leads

										Black
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	Wire Lead Gauge	OD, mm	Lg., ft.	Housing Material	Temp. Range, °F		Each
2.1	5.5	2	48V DC	7	18	11.4	6	Plastic	-40° to 175°	00000000	00000
2.5	5.5	2	48V DC	7	18	11.4	6	Plastic	-40° to 175°	00000000	0000

Push-In Sockets with Screw-Clamp Terminals

Push-In Socket with Screw-Clamp Terminals

											Black
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	Lg., mm	Wd., mm	Ht., mm	Housing Material	Temp. Range, °F		Each
2.1	5.5	2	48V DC	7	24-18	32.5	11	11	Plastic	-10° to 155°	0000000	00000

Push-In Receptacles with Wire Leads

Push-In Receptacle with Wire Leads

								Cable						Mounting Thread			Black
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	Wire Lead Gauge	OD, mm	Lg., ft.	OD, mm	Color	Cable Lead Lg., ft.	Housing Material	Housing Thread Location	For Panel Cutout Dia., mm	Size	Pitch, mm	Temp. Range, °F		Each
Off (Normally Open)
2.1	5.5	2	48V DC	9	18	15	1	5.4	Black	1	Plastic	External	12	M12	1	-10° to 175°	0000000	000000
2.5	5.5	2	48V DC	8	18	15	1	5.4	Black	1	Plastic	External	12	M12	1	-10° to 175°	0000000	00000

Push-In Receptacles with Solder Connection

IP68-Rated Push-In Receptacle with Solder Connection

											Mounting Thread
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	OD, mm	Lg., mm	Housing Material	Housing Thread Location	For Panel Cutout Dia., mm	Size	Type	Temp. Range, °F	Environmental Rating		Each
Off (Normally Open)
2	5.5	2	24V DC	13	20	11.9	36.3	Nickel-Plated Brass	External	8	5/16"-32	UNEF	-40° to 220°	IP68	0000000	000000

Screw-Together Receptacles with Wire Leads

Screw-Together Receptacle with Wire Leads

											Mounting Thread			Black
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	Wire Lead Gauge	OD, mm	Lg., ft.	Housing Material	Housing Thread Location	For Panel Cutout Dia., mm	Size	Pitch, mm	Temp. Range, °F		Each
Off (Normally Open)
2.1	5.5	2	48V DC	7.5	18	12.5	1	Plastic	External	11	M11	1	-40° to 175°	00000000	00000
2.5	5.5	2	48V DC	7.5	18	12.5	1	Plastic	External	11	M11	1	-40° to 175°	00000000	0000

Screw-Together Receptacles with Solder Connection

Screw-Together Receptacle
with Solder Connection
and Off Circuit Position

Screw-Together Receptacle
with Solder Connection
and On Circuit Position

											Mounting Thread				Black
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	For Wire Gauge	OD, mm	Lg., mm	Housing Material	Housing Thread Location	For Panel Cutout Dia., mm	Size	Pitch, mm	Features	Temp. Range, °F		Each
Off (Normally Open)
1.3	3.5	2	12V DC	5	24, 22, 20, 18	10.8	21	Plastic	External	8	M8	0.75	__	-10° to 140°	00000000	00000
2.1	5.5	2	12V DC	5	24, 22, 20, 18	10.6	19.9	Plastic	External	8	M8	0.75	__	-10° to 140°	00000000	0000
2.5	5.5	2	12V DC	5	24, 22, 20, 18	10.8	21.4	Plastic	External	8	M8	0.75	__	-10° to 140°	00000000	0000
On (Normally Closed)
2.1	5.5	2	12V DC	5	24, 22, 20, 18	10.8	21.4	Plastic	External	8	M8	0.75	Internal Switch	-10° to 140°	00000000	0000
2.5	5.5	2	12V DC	5	24, 22, 20, 18	10.8	21.4	Plastic	External	8	M8	0.75	Internal Switch	-10° to 140°	00000000	0000

Socket × Plug Push-In Adapter

Socket x Plug Push-In Adapter

Socket		Plug									Black
For Plug End ID, mm	For Plug End OD, mm	End ID, mm	End OD, mm	End Lg., mm	Voltage	Current, A	OD, mm	Lg., mm	Housing Material	Temp. Range, °F		Each
2.1	5.5	2.5	5.5	12	48V DC	7	11.4	42	Plastic	-10° to 155°	0000000	00000

Circuit Board Barrel-Style DC Connectors

Install these connectors directly onto circuit boards to carry DC power from a power supply to your device. The industry standard barrel-style ends are often found on power supplies for laptops, wireless routers, and other common electronics. Push the contacts through holes in your circuit board and solder them in place.

Push-in connectors are quicker to connect and disconnect than screw-together connectors.

Screw-together connectors are less likely to disconnect from vibration or getting yanked out than push-in connectors. This makes them good for preventing power loss. However, they take longer to connect and disconnect.

For technical drawings and 3-D models, click on a part number.

90° Elbow Push-In Receptacles

Off (Normally Open)
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	Lg., mm	Wd., mm	Ht., mm	Color	Housing Material	Temp. Range, °F	Specifications Met		Each
1.3	3.5	2	24V DC	5	14.5	9	11	Black	Plastic	-20° to 145°	UL Recognized Component	0000000	00000
2	5.5	2	24V DC	5	14.5	9	11	Black	Plastic	-20° to 145°	UL Recognized Component	0000000	0000
2.5	5.5	2	24V DC	5	14.5	9	11	Black	Plastic	-20° to 145°	UL Recognized Component	0000000	0000

Straight Screw-Together Receptacles

										Mounting Thread
For Plug End ID, mm	For Plug End OD, mm	Number of Poles	Voltage	Current, A	OD, mm	Lg., mm	Color	Housing Material	Housing Thread Location	Size	Type	Temp. Range, °F	Specifications Met		Each
Off (Normally Open)
1.3	3.5	2	24V DC	7.5	11	13.7	Beige	Plastic	External	5/16"-32	UNEF	-40° to 220°	UL Recognized Component	0000000	00000
2	5.5	2	24V DC	5	11	13.7	Black	Plastic	External	5/16"-32	UNEF	-65° to 185°	UL Recognized Component	0000000	0000
2.1	5.5	2	24V DC	5	11	13.7	Red	Plastic	External	5/16"-32	UNEF	-65° to 185°	__	0000000	0000
2.5	5.5	2	24V DC	5	11	13.7	Black	Plastic	External	5/16"-32	UNEF	-65° to 185°	UL Recognized Component	0000000	0000

Caps for Micro M12 Screw-Together Connectors

For Plugs

For Sockets

Protect M12 connectors when not in use.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Type	Location	Material	Color	Temp. Range, °F		Each
For Plugs
M12	1	Metric	Internal	Anodized Aluminum	Black	0° to 220°	0000000	000000
For Sockets
M12	1	Metric	External	Anodized Aluminum	Black	0° to 220°	0000000	00000

Caps for Harsh Environment Micro M12 Screw-Together Connectors

For Plugs

For Sockets

Protect harsh environment M12 connectors when not in use. These caps are stainless steel for excellent corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Type	Location	Material	Temp. Range, °F		Each
For Plugs
M12	1	Metric	Internal	Stainless Steel	0° to 220°	0000000	000000
For Sockets
M12	1	Metric	External	Stainless Steel	0° to 220°	0000000	00000

Leveling Micrometer Heads

Precisely level heavy machines, surface plates, and other devices when accuracy is crucial. These heads raise and lower objects in 0.01 mm increments, which is as thin as a single sheet of paper. Turn the handle to adjust their height, even when under a machine.

					Overall
Measuring Range, mm	Measuring Increments, mm	Point Angle	Spindle Face Material	Capacity, lbs.	Wd.	Ht.	Base Dia.	Handle Lg.	Features	Manufacturer	Manufacturer Model Number		Each
Plain Thimble—Rotating Spindle
60 to 75	0.01	90°	Steel	850	4 19/32"	2 3/8"	2 17/32"	3 11/32"	Handle	Mitutoyo	7850	0000000	0000000