NEMA L21-20 Connectors | McMaster-Carr

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30 Products

About NEMA Plugs, Sockets, and Receptacles

Turn-Lock Plugs, Sockets, and Receptacles

A quarter turn locks these connectors in place to remain secure in high-vibration applications and prevent accidental disconnection.

Receptacles for outlet boxes fit standard wall plates (not included).

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

Five-Blade Plugs

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	2.2"	Screw Terminals	0.23"-1.15"	UL Listed, CSA Certified	Black	0000000	000000

Five-Blade 90° Elbow Plugs

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	2.6"	Screw Terminals	0.23"-1.15"	UL Listed	Black	0000000	000000

Five-Slot Sockets

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	2.2"	Screw Terminals	0.23"-1.15"	UL Listed, CSA Certified	Black	0000000	000000

Five-Slot Single Female Receptacles

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	Face Dia.	Wire Connection Type	Receptacle Terminal Location	Mounting Location	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	1.6"	Screw Terminals	Back	Outlet Box	UL Listed, CSA Certified	Black	0000000	000000

Five-Slot Panel-Mount Female Receptacles

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	Wire Connection Type	Receptacle Terminal Location	For Panel Cutout Dia.	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	Screw Terminals	Back, Side	2.1"	UL Listed, CSA Certified	Gray	0000000	000000

Five-Blade Panel-Mount Male Receptacles

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	Wire Connection Type	Receptacle Terminal Location	For Panel Cutout Dia.	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	Screw Terminals	Back, Side	2.3"	UL Listed, CSA Certified	Gray	0000000	000000

Premium Turn-Lock Plugs, Sockets, and Receptacles

Also known as twist-lock devices, these connectors are built to handle tough, repetitive-use applications, and are more durable than standard turn-lock connectors. A quarter turn locks them in place to remain secure in high-vibration applications and prevent accidental disconnection.

Receptacles for outlet boxes fit standard wall plates (not included).

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

Five-Blade Plugs

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color	Environmental Rating	Specifications Met		Each
L21-20	120V AC/208V AC	20A	2.3"	Screw Terminals	0.35"-1.15"	Black	IP20	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 94 HB, UL 498	0000000	000000

Five-Slot Sockets

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color	Specifications Met		Each
L21-20	120V AC/208V AC	20A	2.3"	Screw Terminals	0.35"-1.15"	Black	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 94 HB, UL 498	0000000	0000000

Five-Slot Single Female Receptacles

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	Face Dia.	Wire Connection Type	Receptacle Terminal Location	Mounting Location	Color	Environmental Rating	Specifications Met		Each
L21-20	120V AC/208V AC	20A	1.6"	Screw Terminals	Back, Side	Outlet Box	Black	IP20	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 94 V-2, UL 498	0000000	000000

Five-Slot Panel-Mount Female Receptacles

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	Wire Connection Type	Receptacle Terminal Location	For Panel Cutout Dia.	Color	Environmental Rating	Specifications Met		Each
L21-20	120V AC/208V AC	20A	Screw Terminals	Back	2.2"	White	IP20	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 94 HB, UL 498	00000000	0000000

Five-Blade Panel-Mount Male Receptacles

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	Wire Connection Type	Receptacle Terminal Location	For Panel Cutout Dia.	Color	Environmental Rating	Specifications Met		Each
L21-20	120V AC/208V AC	20A	Screw Terminals	Back	2.2"	White	IP20	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 94 HB, UL 498	0000000	000000

Interference-Limiting Turn-Lock Receptacles

Protect computers and other sensitive equipment from electromagnetic interference (EMI). Also known as isolated ground receptacles, they have a ground terminal that is insulated from the mounting strap so you can run an isolated ground wire through the conduit. When mated with a plug, a quarter turn locks them in place to remain secure in high-vibration applications and prevent accidental disconnection. Receptacles fit standard wall plates (not included).

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

Five-Slot Single Female Receptacles

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	Face Dia.	Wire Connection Type	Receptacle Terminal Location	Mounting Location	Features	Color		Each
L21-20	120V AC/208V AC	20A	1.6"	Screw Terminals	Back, Side	Outlet Box	Green Triangle, Isolated Ground Connection	Orange	0000000	000000

Washdown Turn-Lock Connectors and Cords

When mated, connectors meet NEMA 6P for protection against corrosion and washdowns. All have a multiple-ring seal and rubber housing to keep out liquid. They resist heat, oil, and chemicals. A quarter turn locks them in place to remain secure in high-vibration applications and prevent accidental disconnection.

Plugs mate with female receptacles and female sockets with an attached cover.

Male receptacles mate with female sockets without an attached cover.

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

Five-Blade Plugs

NEMA L21-20 Male

Plugs									Caps for Plugs
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color		Each		Each
Grounded
L21-20	120V AC/208V AC	20A	2.5"	Screw Terminals	0.56"-0.81"	Yellow	000000000	000000	000000000	000000
L21-20	120V AC/208V AC	20A	2.5"	Screw Terminals	0.56"-0.81"	Black	000000000	00000	000000000	00000

Five-Slot Sockets

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color		Each
L21-20	120V AC/208V AC	20A	2.5"	Screw Terminals	0.56"-0.81"	Yellow	000000000	000000

Five-Slot Sockets with Attached Cover

NEMA L21-20 Female

Sockets									Replacement Caps for Sockets
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color		Each		Each
Grounded
L21-20	120V AC/208V AC	20A	2.5"	Screw Terminals	0.56"-0.81"	Yellow	000000000	0000000	000000000	000000
L21-20	120V AC/208V AC	20A	2.5"	Screw Terminals	0.56"-0.81"	Black	000000000	000000	000000000	00000

Five-Slot Single Female Receptacles with Attached Cover

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	Wire Connection Type	Receptacle Terminal Location	Mounting Location	Color		Each
L21-20	120V AC/208V AC	20A	Screw Terminals	Back	Outlet Box	Yellow	000000000	000000
L21-20	120V AC/208V AC	20A	Screw Terminals	Back, Front, Side	Outlet Box	Black	000000000	000000

Outlet Box—3/4 NPT Female Conduit Connection	00000000	Each	000000
Outlet Box—1/2 NPT Female Conduit Connection	00000000	Each	00000

Five-Blade Single Male Receptacles with Attached Cover

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	Wire Connection Type	Receptacle Terminal Location	Mounting Location	Color		Each
L21-20	120V AC/208V AC	20A	Screw Terminals	Back	Outlet Box	Yellow	000000000	0000000

Outlet Box—3/4 NPT Female Conduit Connection	00000000	Each	000000
Outlet Box—1/2 NPT Female Conduit Connection	00000000	Each	00000

Impact-Resistant Turn-Lock Connectors

A rubber housing protects these connectors from damage caused by drops and impact. Lock them in place with a quarter turn to remain secure in high-vibration applications and prevent accidental disconnection. Not intended for use in wet or damp environments.

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

Five-Blade Plugs

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color		Each
L21-20	120V AC/208V AC	20A	1.9"	Screw Terminals	0.33"-0.84"	Yellow	0000000	000000

Five-Slot Sockets

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Color		Each
L21-20	120V AC/208V AC	20A	1.9"	Screw Terminals	0.33"-0.84"	Yellow	0000000	000000

Corrosion-Resistant Turn-Lock Connectors

Stainless steel hardware and nickel-plated blades or slots protect connectors from damage in corrosive environments. A quarter turn locks them in place to remain secure in high-vibration applications and prevent accidental disconnection.

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

Five-Blade Plugs

NEMA L21-20 Male

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Environmental Rating	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	2.2"	Screw Terminals	0.35"-1.15"	IP20	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 498, UL 94 HB	Yellow	0000000	000000

Five-Slot Sockets

NEMA L21-20 Female

Grounded
NEMA Style	Voltage	Current	OD	Wire Connection Type	For Cable OD	Environmental Rating	Specifications Met	Color		Each
L21-20	120V AC/208V AC	20A	2.3"	Screw Terminals	0.35"-1.15"	IP20	UL Listed, CSA Certified, Fed. Spec. W-C-596, UL 498, UL 94 HB	Yellow	0000000	0000000