NEMA L21-20 Plugs | 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).

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).

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).

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.

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

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.

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