Schmidt Couplings | McMaster-Carr

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System of Measurement

Shaft Diameter

Shaft Type

For Shaft Misalignment Type

Overall Length

Keyway Width

Flexible Shaft Coupling Type

For Rotary Motion

Material

Length

Keyway Depth

Component

Maximum Torque

10 in·lbf to 24 in·lbf

25 in·lbf to 99 in·lbf

100 in·lbf to 249 in·lbf

250 in·lbf or greater

Clamping Screw Material

Stainless Steel

Steel

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

Performance

Flexible Shaft Coupling Trade Size

REACH

RoHS

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

1C998

EAR99

Maximum Rotation Speed

Parallel Misalignment Capability

Torque

10 in·lbf to 24 in·lbf

25 in·lbf to 99 in·lbf

100 in·lbf to 249 in·lbf

250 in·lbf or greater

Axial Misalignment Capability

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44 Products

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For Shaft Type

Round

Hubs for the standard shaft type

30 products

Keyed

Mount onto shafts with a matching keyway

14 products

Component

Hub

Grip a center component to transmit torque between shafts

20 products

Disc

Flex or allow shafts to slide to accommodate misalignment

39 products

High-Angular-Misalignment Flex Disc Couplings

With a flexible center disc, these couplings handle high misalignment in conveyor rollers, printing machines, and other assemblies that tilt or flex. They also transmit torque fully between shafts (zero backlash). The plastic disc prevents metal-to-metal contact between hubs, so they don't require lubrication. Also known as Schmidt couplings. For a complete coupling, select two hubs and one flex disc. Choose components of the same trade size to ensure they'll fit together.

Hubs for a 1/2" shaft diameter and above have a keyway. Hubs for metric sizes do not have a keyway—with the exception of hubs for 10mm and 15mm shaft diameters, which do have a keyway.

Hubs

The metal body mounts onto shafts to transmit torque from one shaft to the other through the flexible center.

Aluminum—Lightweight and corrosion resistant.

Clamp-On Shaft Mount—Grip shafts evenly without marring them and hold tighter than set screws. Tighten the clamping screws to secure.

	Shaft Coupling Trade Size	Overall Lg.	Shaft Mount Type	Choose a Shaft Dia.		Each
Aluminum



	47/64"	C008P	5/8"	Clamp On	1/8", 1/4", 3/8", 6 mm, 8 mm, 10 mm	60635K1	000000


	63/64"	C011P	1"	Clamp On	1/8", 1/4", 3/8", 1/2", 6 mm, 8 mm, 10 mm, 12 mm	60635K2	00000
	1 15/32"	C016P	1 3/16"	Clamp On	1/8", 3/16", 1/4", 3/8", 1/2", 5/8", 6 mm, 10 mm, 15 mm	60635K3	00000
	2 3/16"	C023P	1 3/4"	Clamp On	3/8", 1/2", 5/8", 3/4", 7/8"	60635K9	00000
	2 15/16"	C031P	2 3/16"	Clamp On	3/8", 1/2", 5/8", 3/4", 7/8", 1"	60635K5	00000

Discs

Insert the pins of the hubs into the small holes on the disc to lock the hubs in place. Also known as frogs.

Acetal—Provide a balance of stiffness and flexibility while withstanding high torque. The best plastic discs for damp and wet environments, these won't swell or lose their strength if exposed to moisture.

					Misalignment Capability
	For Hub OD	Shaft Coupling Trade Size	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Axial		Each
Acetal



		47/64"	C008P	12,000	6	0.013"	1.5°	0.01"	60635K86	000000


		63/64"	C011P	11,000	13	0.019"	1.5°	0.014"	60635K87	00000
		1 15/32"	C016P	8,000	45	0.028"	1.5°	0.021"	60635K88	00000
		2 3/16"	C023P	6,000	150	0.041"	1.5°	0.031"	60635K99	00000
		2 15/16"	C031P	5,000	360	0.055"	1.5°	0.042"	60635K75	00000

Cleaned and Bagged Slotted Disc Couplings

Prevent contamination in electronics plants and other extra-clean environments. These couplings are cleaned, assembled, and individually bagged in a clean room. The smooth plastic center won't outgas much and won't collect bacteria, dirt, or dust.

Also known as Oldham couplings, these connect shafts that are in parallel misalignment. The center disc allows the shafts and hubs to slide independently, unlike couplings with centers that flex to compensate for misalignment. No lubrication required.

Hubs and Discs

Image of Product. Front orientation. Flexible Shaft Couplings. Cleaned and Bagged Slotted Disc Couplings.

With two perpendicular slots (one on each side), these discs allow shafts to slide, adjusting for parallel misalignment.

Aluminum Hub with PEEK Disc—Both hubs and the disc are lightweight and corrosion resistant.

					Misalignment Capability
Choose a Shaft Dia.	Overall Lg., mm	OD, mm	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel, mm	Angular	Temp. Range, ° F		Each







			Aluminum Hub with PEEK Disc

			5 mm × 5 mm	22	20	31,000	10	1.3	2°	0 to 240	8819N37	0000000


			5 mm × 6 mm	22	20	31,000	10	1.3	2°	0 to 240	8819N38	000000
			5 mm × 8 mm	22	20	31,000	10	1.3	2°	0 to 240	8819N39	000000
			6 mm × 6 mm	22	20	31,000	10	1.3	2°	0 to 240	8819N41	000000
			6 mm × 8 mm	22	20	31,000	10	1.3	2°	0 to 240	8819N42	000000
			8 mm × 8 mm	27	25	25,000	20	1.5	2°	0 to 240	8819N44	000000
			8 mm × 10 mm	27	25	25,000	20	1.5	2°	0 to 240	8819N45	000000
			10 mm × 10 mm	33	32	19,000	45	2	2°	0 to 240	8819N47	000000
			10 mm × 11 mm	33	32	19,000	45	2	2°	0 to 240	8819N48	000000
			10 mm × 12 mm	33	32	19,000	45	2	2°	0 to 240	8819N49	000000
			10 mm × 14 mm	33	32	19,000	45	2	2°	0 to 240	8819N51	000000


			11 mm × 11 mm	33	32	19,000	45	2	2°	0 to 240	8819N52	000000
			11 mm × 12 mm	33	32	19,000	45	2	2°	0 to 240	8819N53	000000
			11 mm × 14 mm	33	32	19,000	45	2	2°	0 to 240	8819N54	000000
			12 mm × 12 mm	33	32	19,000	45	2	2°	0 to 240	8819N55	000000

High-Parallel-Misalignment Slotted Disc Couplings

Unlike couplings that flex to handle offset shafts, these have a slotted center disc that allows shafts to slide independently to compensate for parallel misalignment. The plastic center disc also helps transmit torque while preventing metal-to-metal contact between hubs, so there's no lubrication required. Also known as Oldham couplings. For a complete coupling, select two hubs and one disc. Choose components of the same trade size to ensure they'll fit together.

Discs

With two perpendicular slots (one on each side), these discs allow shafts to slide, adjusting for parallel misalignment.

Nylon—Keep these wear-resistant discs dry, since they'll swell and weaken if exposed to moisture.

PEEK—Stronger, stiffer, and more wear resistant than nylon and acetal discs.

					Misalignment Capability
	For Hub OD	Shaft Coupling Trade Size	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Axial		Each
Acetal



		1/2"	8/13	4,500	6	0.004"	0.5°	0.002"	59985K61	00000


		3/4"	12/19	4,500	20	0.008"	0.5°	0.004"	59985K62	0000
		1"	16/25	4,500	42	0.008"	0.5°	0.004"	59985K63	00000
		1 5/16"	21/33	4,500	70	0.008"	0.5°	0.006"	59985K64	00000
		1 5/8"	26/41	4,500	130	0.01"	0.5°	0.006"	59985K65	00000
		2"	32/51	4,500	250	0.01"	0.5°	0.008"	59985K715	00000
		2 1/4"	36/57	4,500	375	0.01"	0.5°	0.008"	59985K717	00000


		Nylon



				1/2"	8/13	4,500	1.5	0.004"	0.5°	0.002"	59985K91	00000


				3/4"	12/19	4,500	5	0.008"	0.5°	0.004"	59985K92	00000
				1"	16/25	4,500	10	0.008"	0.5°	0.004"	59985K93	00000
				1 5/16"	21/33	4,500	18	0.008"	0.5°	0.006"	59985K94	00000
				1 5/8"	26/41	4,500	32	0.01"	0.5°	0.006"	59985K95	00000


				PEEK



						1/2"	8/13	4,500	6	0.004"	0.5°	0.002"	59985K719	00000


						3/4"	12/19	4,500	20	0.008"	0.5°	0.004"	59985K711	00000
						1"	16/25	4,500	42	0.008"	0.5°	0.004"	59985K712	00000
						1 5/16"	21/33	4,500	70	0.008"	0.5°	0.006"	59985K713	00000
						1 5/8"	26/41	4,500	130	0.01"	0.5°	0.006"	59985K714	00000
						2"	32/51	4,500	250	0.01"	0.5°	0.008"	59985K716	000000
						2 1/4"	36/57	4,500	375	0.01"	0.5°	0.008"	59985K718	00000