Ferrite Rings | McMaster-Carr

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32 Products

Ferrite Cores

Often used as inductors and transformers in electrical circuits, these cores generate a magnetic hold when magnet wire (sold separately) is wrapped over them and energized. Remove the electric current and the cores lose their magnetism.

Ring

Thk.	OD	Hole Dia.	Temp., ° F	Material		Each
1/16"	15/64"	1/8"	-65 to 250	Ferrite Ceramic	8495K281	00000
1/8"	3/8"	3/16"	-65 to 250	Ferrite Ceramic	8495K381	0000
1/4"	1/2"	5/16"	-65 to 250	Ferrite Ceramic	8495K481	0000
1/2"	1"	39/64"	-65 to 250	Ferrite Ceramic	8495K571	0000

Ceramic Disc Magnets

Our most economical magnets cut costs, not reliability. They stay strong in temperatures up to 400° F and resist some corrosion. They’re also nonconductive to prevent short circuits in DC motors, transformers, and speakers. However, they are not as strong as rare earth magnets.

Warning: Maximum pull ratings are based on direct contact with rust-free, unpainted iron surfaces. Variations in material condition will significantly reduce these ratings. Do not use for lifting over people.

Magnets With Unthreaded Hole


	Magnetized Through Thickness

Mount with pins, bolts, or rivets. There's no need for threading.

Magnetized Through Thickness—Magnetized from one flat face to the other, these magnets deliver a concentrated magnetic force. They’re best for direct contact with flat surfaces.

	Hole Dia.	Max. Pull, lbf	Max. Temp., ° F	Magnet Grade	Direction of Magnetization	Mounting Hole Style		Each
0.118" Thick



	11/16"	19/64"	0.4	400	C8	Through Thickness	Straight	5856K11	00000


	1/8" Thick



			1/2"	3/16"	0.1	400	C1	Through Thickness	Straight	5856K1	0000


			3/16" Thick



					1 1/4"	3/8"	1	400	C5	Through Thickness	Straight	5856K12	0000


					15/64" Thick



							1 1/8"	3/8"	0.6	400	C1	Through Thickness	Straight	5856K3	0000


							1/4" Thick



									3/4"	17/64"	0.3	400	C1	Through Thickness	Straight	5856K2	0000


									1 3/64"	0.597"	0.7	400	C1	Through Thickness	Straight	5856K4	0000
									1 45/64"	0.705"	0.7	400	C1	Through Thickness	Straight	5856K8	0000


									9/32" Thick



											2 3/8"	1"	3	400	C5	Through Thickness	Straight	5856K14	0000


											19/64" Thick



													2 1/32"	0.705"	1.7	400	C1	Through Thickness	Straight	5856K7	0000


													5/16" Thick



															1 49/64"	0.866"	2.5	400	C5	Through Thickness	Straight	5856K13	0000


															21/64" Thick



																	2 51/64"	1 13/64"	4	400	C5	Through Thickness	Straight	5856K15	0000


13/32" Thick



																	4 35/64"	1 3/4"	9	400	C5	Through Thickness	Straight	5856K17	00000


	27/64" Thick



																	3 3/8"	1.28"	7	400	C5	Through Thickness	Straight	5856K16	00000


			7/16" Thick



																	1 15/64"	0.885"	0.6	400	C1	Through Thickness	Straight	5856K5	0000


																	35/64" Thick



																	5 17/64"	2.21"	17	400	C5	Through Thickness	Straight	5856K18	00000

Encased Ceramic Disc Magnets


2	3

4	8

Our most economical magnets with built-in durability. A protective case shields them from cracks and chips caused by bumps and drops. Ceramic magnets deliver a cost-effective balance of corrosion and temperature resistance. However, they are not as strong as rare earth magnets.

Warning: Maximum pull ratings are based on direct contact with rust-free, unpainted iron surfaces. Variations in material condition will significantly reduce holding strength. Do not use for lifting over people.

Magnets With Unthreaded Hole


2	3

4

Mount with pins, bolts, or rivets. There's no need for threading.

Zinc-Plated Steel Case—Withstands occasional exposure to moisture.

Chrome-Plated Steel Case—The bright, shiny finish resists salt water and chemicals better than other finishes and is less likely to wear off.

Stainless Steel Case—Our most corrosion-resistant case withstands exposure to chemicals. However, it's not as strong as steel.

Anodized Aluminum Case—The anodized finish adds an extra layer of corrosion resistance.

	Thk.	OD	Hole Dia.	Max. Pull, lbf	Max. Temp., ° F	Magnet Grade	Mounting Hole Style	For Screw Size		Each
Zinc-Plated Steel Case



	2	33/64"	3 7/8"	3/8"	147	245	C8	Straight	5/16"	5685K83	000000


	3	3/16"	1 15/64"	0.138"	15	245	C8	Straight	No. 6	5819K31	0000
	3	5/16"	2 1/32"	0.19"	42	245	C8	Straight	No. 10	5819K33	0000
	3	3/8"	2 5/8"	1/4"	80	245	C8	Straight	1/4"	5819K35	00000
	3	7/16"	3 3/16"	1/4"	140	245	C8	Straight	1/4"	5819K37	00000


	Chrome-Plated Steel Case



			3	19/64"	2 1/32"	3/16"	35	170	C5	Straight	No. 8	5685K82	0000


			3	33/64"	3 3/8"	3/8"	120	170	C5	Straight	5/16"	5685K81	00000


			Stainless Steel Case



					2	7 mm	32 mm	6 mm	13	425	—	Countersunk	M5	5685K73	0000


					2	8 mm	40 mm	6 mm	16	425	—	Countersunk	M5	5685K74	0000
					2	10 mm	50 mm	9 mm	32	425	—	Straight	M8	5685K75	00000
					2	14 mm	63 mm	7 mm	50	425	—	Straight	M6	5685K76	00000


					Anodized Aluminum Case



							4	1/2"	3"	1/4"	24	180	C8	Straight	1/4"	5782K71	00000

Magnets With Mounting Plate

Add a magnetic surface anywhere. Install the mounting plate, then screw on the magnet.

Chrome-Plated Steel Case—The bright, shiny finish resists salt water and chemicals better than other finishes and is less likely to wear off.

									Mounting
	Style	Thk.	OD	Hole Dia.	Max. Pull, lbf	Max. Temp.	Mounting Hole Style	Thread Size	Plate Material	Hole Dia.	Plate Thk.		Each
Chrome-Plated Steel Case



		8	0.73"	2 5/64"	0.275"	4.5	Not Rated	Straight	1/4"-20	Plastic	0.085"	0.35"	1046A5	000000