Grounding Rings | McMaster-Carr

Filter by

Conduit Trade Size

Construction

Shaft Diameter

Motor Frame Size

Conduit Connection

Material

Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

REACH

RoHS

DFARS Specialty Metals

Exempt

Thread Size

5-40

6-32

Mounting Fastener Thread Size

5-40

6-32

Mounting Fastener Head Style

Conduit Type

For Use With

Fitting Connection

28 Products

Shaft Grounding Rings

Shaft Grounding Ring Shown

Installed

One Piece

Two Piece

Prevent motor downtime by protecting bearings from stray currents generated by variable frequency drives. These grounding rings create a path for stray currents, so they won't damage bearing surfaces. Use them on AC motors.

One Piece—One-piece rings slide on from the end of the shaft.

Two Piece—Two-piece rings simplify installation when motors are connected to equipment.

					One Piece		Two Piece
	For Shaft Dia.	For Motor Frame Size	Mounting Hardware Included	Includes		Each		Each
Aluminum



		5/8"	NEMA 56	Yes	16 Brackets (4 each of 4 Common Styles)	4805N11	0000000	4805N22	0000000


		7/8"	NEMA 56HZ, NEMA 143T, NEMA 145T	Yes	16 Brackets (4 each of 4 Common Styles)	4805N12	000000	4805N23	000000
		1 1/8"	NEMA 182T, NEMA 184T	Yes	16 Brackets (4 each of 4 Common Styles)	4805N13	000000	4805N24	000000
		1 3/8"	NEMA 213T, NEMA 215T	Yes	16 Brackets (4 each of 4 Common Styles)	4805N14	000000	4805N25	000000
		1 5/8"	NEMA 254T, NEMA 256T, NEMA 284TS, NEMA 286TS	Yes	16 Brackets (4 each of 4 Common Styles)	4805N15	000000	4805N26	000000
		1 7/8"	NEMA 284T, NEMA 286T, NEMA 324TS, NEMA 326TS, NEMA 364TS, NEMA 365TS	Yes	16 Brackets (4 each of 4 Common Styles)	4805N16	000000	4805N27	000000
		2 1/8"	NEMA 324T, NEMA 326T, NEMA 404TS, NEMA 405TS	Yes	16 Brackets (4 each of 4 Common Styles)	4805N17	000000	4805N28	000000
		2 3/8"	NEMA 364T, NEMA 365T, NEMA 444TS, NEMA 445TS, NEMA 447TS, NEMA 449TS	Yes	16 Brackets (4 each of 4 Common Styles)	4805N18	000000	4805N29	000000
		2 7/8"	NEMA 404T, NEMA 405T	Yes	16 Brackets (4 each of 4 Common Styles)	4805N19	000000	4805N31	000000
		3 3/8"	NEMA 444T, NEMA 445T, NEMA 447T, NEMA 449T	Yes	16 Brackets (4 each of 4 Common Styles)	4805N21	000000	4805N32	00000000

Accessories for Grounding Rings

Conductive Adhesives

Image of Product. Front orientation. Grounding Rings.

Use adhesives to install rings without having to drill or tap into motor frames.

Container
Size, fl. oz.	Type	Begins to Harden, min.	Reaches Full Strength, hr.	Mix Ratio		Each
0.5	Adhesive	10	24	1:1	4805N33	0000000

Conductive Coatings

Apply conductive coatings to motor shafts before installing the rings to improve the conductivity of the steel shaft surface that touches the grounding ring.

Container		Dry Time
Size, fl. oz.	Type	Touch, min.	Overall, hr.	Max. Temp., ° F	Application Temp., ° F	Color		Each
0.5	Bottle	30	24	330	72 to 300	Gray	4805N34	0000000

Grounding Conduit Clamps


Grounding Clamp	Grounding Clamp with Hinge

Ground conduit by running a ground wire through the attached lug. The included grommet protects wire and cable from abrasion when being pulled. Use with medium-wall (IMC) and thick-wall (rigid) steel conduit.

Hinge—Grounding clamps with hinge open for quick installation around conduit and secure with a screw.

	Pipe Size	Thread Type	Gender	Material	For Use With		Each
Grounding Clamp



	1/2	1/2	NPSM	Female	Zinc	Aluminum Wire, Copper Wire	7513K251	000000


	Grounding Clamp with Hinge



			3/4	—	—	Female	Zinc	Aluminum Wire, Copper Wire	7513K252	00000


			1	—	—	Female	Zinc	Aluminum Wire, Copper Wire	7513K253	00000
			1 1/4	—	—	Female	Zinc	Aluminum Wire, Copper Wire	7513K254	00000
			1 1/2	—	—	Female	Zinc	Aluminum Wire, Copper Wire	7513K255	00000
			2	—	—	Female	Zinc	Aluminum Wire, Copper Wire	7513K256	00000