Bellows Shaft Couplings | McMaster-Carr

Filter by

System of Measurement

Shaft Diameter

For Shaft Misalignment Type

Overall Length

Shaft Mount Type

Material

Maximum Torque

25 in·lbf to 49 in·lbf

50 in·lbf to 249 in·lbf

250 in·lbf or greater

Maximum Rotation Speed

10,000 rpm

Not Rated

Angular Misalignment Capability

For Rotary Motion

Length

Parallel Misalignment Capability

Axial Misalignment Capability

Bellows Material

Torque

25 in·lbf to 49 in·lbf

50 in·lbf to 249 in·lbf

250 in·lbf or greater

REACH

Compliant

RoHS

Compliant

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Performance

127 Products

Shaft Mount Type

Clamp On

Grip shafts evenly without marring and hold tighter than set screws

117 products

Set Screw

Screws dig into your shaft for a secure hold

10 products

Performance

Lightweight

Minimize weight on the shafts to lower energy use

117 products

Precision Bellows Couplings

With a thin-walled, corrugated-metal center tube (bellows), these couplings flex to handle all types of misalignment while transmitting high torque. They're ideal for stepper motors, encoders, and other equipment that requires torque to be fully transferred between shafts (zero backlash). They have no moving parts or inserts, so they don't require lubrication.

Aluminum with 321 Stainless Steel Bellows—Lightweight aluminum hubs paired with stainless steel bellows for corrosion resistance.

303 Stainless Steel with Nickel Bellows—These corrosion-resistant couplings withstand mild cleaning solutions.

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

Set-Screw Shaft Mount—Screws dig into your shaft for a secure hold.

						Misalignment Capability
	Choose a Shaft Dia.	OD	Overall Lg.	Max. Rotation Speed	Max. Torque, in·lbf	Parallel	Angular	Axial	For Shaft Type	Shaft Mount Type		Each







				Aluminum with 321 Stainless Steel Bellows

				1/8" × 1/8"	19/32"	1 1/16"	10,000 rpm	22	0.004"	1.5°	0.008"	Round	Clamp On	6446K271	0000000


				3/16" × 3 mm	19/32"	1 1/16"	10,000 rpm	22	0.004"	1.5°	0.008"	Round	Clamp On	6446K762	000000
				3/16" × 5 mm	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K769	000000
				1/4" × 1/4"	19/32"	1 1/16"	10,000 rpm	22	0.004"	1.5°	0.008"	Round	Clamp On	6446K276	000000
				1/4" × 1/4"	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K313	000000
				1/4" × 1/4"	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K41	000000
				1/4" × 3/8"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K89	000000
				1/4" × 3 mm	19/32"	1 1/16"	10,000 rpm	22	0.004"	1.5°	0.008"	Round	Clamp On	6446K757	000000
				1/4" × 5 mm	19/32"	1 1/16"	10,000 rpm	22	0.004"	1.5°	0.008"	Round	Clamp On	6446K759	000000
				1/4" × 5 mm	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K766	000000
				1/4" × 6 mm	19/32"	1 1/16"	10,000 rpm	22	0.004"	1.5°	0.008"	Round	Clamp On	6446K761	000000


				1/4" × 6 mm	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K767	000000
				1/4" × 8 mm	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K772	000000
				1/4" × 8 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K782	000000
				1/4" × 10 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K785	000000
				5/16" × 1/4"	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K315	000000
				5/16" × 5/16"	3/4"	1 5/16"	10,000 rpm	40	0.004"	1.5°	0.01"	Round	Clamp On	6446K316	000000
				3/8" × 1/4"	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K563	000000
				3/8" × 3/8"	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K565	000000
				3/8" × 3/8"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K613	000000
				3/8" × 3/8"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K43	000000


				3/8" × 6 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K779	000000
				3/8" × 8 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K781	000000
				3/8" × 10 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K783	000000
				1/2" × 1/4"	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K566	000000
				1/2" × 1/4"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K45	000000
				1/2" × 3/8"	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K568	000000
				1/2" × 3/8"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K615	000000
				1/2" × 3/8"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K44	000000
				1/2" × 1/2"	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K569	000000
				1/2" × 1/2"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K616	000000


				1/2" × 1/2"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K46	000000
				1/2" × 1/2"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K861	000000
				1/2" × 6 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K776	000000
				1/2" × 8 mm	1"	1 11/32"	10,000 rpm	60	0.004"	1.5°	0.012"	Round	Clamp On	6446K777	000000
				1/2" × 8 mm	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K789	000000
				1/2" × 10 mm	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K787	000000
				1/2" × 10 mm	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K794	000000
				1/2" × 15 mm	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K795	000000
				5/8" × 3/8"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K618	000000
				5/8" × 3/8"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K911	000000


				5/8" × 1/2"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K619	000000
				5/8" × 1/2"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K912	000000
				5/8" × 1/2"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K862	000000
				5/8" × 5/8"	1 5/16"	1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K621	000000
5/8" × 5/8"				1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K47	000000
5/8" × 5/8"	2"			2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K863	000000
5/8" × 10 mm	1 5/16"			1 11/16"	10,000 rpm	120	0.006"	1.5°	0.016"	Round	Clamp On	6446K791	000000
5/8" × 12 mm	1 5/8"			2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K803	000000
5/8" × 20 mm	2"			2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K813	000000
3/4" × 3/8"	1 5/8"	2 1/32"		10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K913	000000
3/4" × 1/2"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K914	000000
3/4" × 1/2"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K864	000000
3/4" × 5/8"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K915	000000
3/4" × 5/8"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K865	000000
3/4" × 3/4"	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K916	000000
3/4" × 3/4"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K866	000000
3/4" × 10 mm	1 5/8"	2 1/32"	10,000 rpm	250	0.01"	2°	0.02"	Round	Clamp On	6446K799	000000
3/4" × 12 mm	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K815	000000
3/4" × 25 mm	2 1/4"	3 1/4"	10,000 rpm	530	0.012"	2°	0.03"	Round	Clamp On	6446K821	000000
7/8" × 1/2"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K867	000000
7/8" × 5/8"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K868	000000
7/8" × 3/4"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K869	000000
7/8" × 7/8"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K871	000000
1" × 1/2"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K872	000000
1" × 5/8"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K873	000000
1" × 3/4"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K874	000000
1" × 7/8"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K875	000000
1" × 1"	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K876	000000
1" × 15 mm	2"	2 13/32"	10,000 rpm	400	0.01"	2°	0.02"	Round	Clamp On	6446K807	000000
1" × 20 mm	2 1/4"	3 1/4"	10,000 rpm	530	0.012"	2°	0.03"	Round	Clamp On	6446K826	000000
1 1/4" × 30 mm	2 1/4"	3 1/4"	10,000 rpm	530	0.012"	2°	0.03"	Round	Clamp On	6446K829	000000
5 mm × 3 mm	15 mm	27.3 mm	10,000 rpm	22	0.1 mm	1.5°	0.2 mm	Round	Clamp On	6446K634	000000
5 mm × 5 mm	15 mm	27.3 mm	10,000 rpm	22	0.1 mm	1.5°	0.2 mm	Round	Clamp On	6446K636	000000
5 mm × 5 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K644	000000
6 mm × 4 mm	15 mm	27.3 mm	10,000 rpm	22	0.1 mm	1.5°	0.2 mm	Round	Clamp On	6446K638	000000
6 mm × 5 mm	15 mm	27.3 mm	10,000 rpm	22	0.1 mm	1.5°	0.2 mm	Round	Clamp On	6446K639	000000
6 mm × 5 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K646	000000
6 mm × 6 mm	15 mm	27.3 mm	10,000 rpm	22	0.1 mm	1.5°	0.2 mm	Round	Clamp On	6446K641	000000
6 mm × 6 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K647	000000
8 mm × 4 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K648	000000
8 mm × 5 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K649	000000
8 mm × 6 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K651	000000
8 mm × 6 mm	25.4 mm	34.2 mm	10,000 rpm	60	0.1 mm	1.5°	0.3 mm	Round	Clamp On	6446K662	000000
8 mm × 8 mm	19.1 mm	33.2 mm	10,000 rpm	40	0.1 mm	1.5°	0.25 mm	Round	Clamp On	6446K652	000000
8 mm × 8 mm	25.4 mm	34.2 mm	10,000 rpm	60	0.1 mm	1.5°	0.3 mm	Round	Clamp On	6446K663	000000
8 mm × 8 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K685	000000
10 mm × 6 mm	25.4 mm	34.2 mm	10,000 rpm	60	0.1 mm	1.5°	0.3 mm	Round	Clamp On	6446K654	000000
10 mm × 8 mm	25.4 mm	34.2 mm	10,000 rpm	60	0.1 mm	1.5°	0.3 mm	Round	Clamp On	6446K655	000000
10 mm × 10 mm	25.4 mm	34.2 mm	10,000 rpm	60	0.1 mm	1.5°	0.3 mm	Round	Clamp On	6446K653	000000
10 mm × 10 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K664	000000
10 mm × 10 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K686	000000
12 mm × 10 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K687	000000
12 mm × 12 mm	25.4 mm	34.2 mm	10,000 rpm	60	0.1 mm	1.5°	0.3 mm	Round	Clamp On	6446K657	000000
12 mm × 12 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K688	000000
14 mm × 10 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K669	000000
14 mm × 10 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K689	000000
14 mm × 12 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K671	000000
14 mm × 14 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K692	000000
14 mm × 14 mm	50.8 mm	61.3 mm	10,000 rpm	400	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K712	000000
15 mm × 14 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K676	000000
15 mm × 14 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K695	000000
16 mm × 8 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K684	000000
16 mm × 10 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K679	000000
16 mm × 10 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K697	000000
16 mm × 15 mm	50.8 mm	61.3 mm	10,000 rpm	400	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K718	000000
16 mm × 16 mm	33.3 mm	43.2 mm	10,000 rpm	120	0.15 mm	1.5°	0.4 mm	Round	Clamp On	6446K683	000000
16 mm × 16 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K701	000000
16 mm × 16 mm	57.2 mm	82.2 mm	10,000 rpm	530	0.3 mm	2°	0.75 mm	Round	Clamp On	6446K737	000000
20 mm × 12 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K703	000000
20 mm × 14 mm	41.3 mm	51.7 mm	10,000 rpm	250	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K704	000000
20 mm × 20 mm	50.8 mm	61.3 mm	10,000 rpm	400	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K726	000000
20 mm × 20 mm	57.2 mm	82.2 mm	10,000 rpm	530	0.3 mm	2°	0.75 mm	Round	Clamp On	6446K736	000000
25 mm × 12 mm	50.8 mm	61.3 mm	10,000 rpm	400	0.25 mm	2°	0.5 mm	Round	Clamp On	6446K727	000000
25 mm × 20 mm	57.2 mm	82.2 mm	10,000 rpm	530	0.3 mm	2°	0.75 mm	Round	Clamp On	6446K742	000000
30 mm × 25 mm	57.2 mm	82.2 mm	10,000 rpm	530	0.3 mm	2°	0.75 mm	Round	Clamp On	6446K741	000000
30 mm × 30 mm	57.2 mm	82.2 mm	10,000 rpm	530	0.3 mm	2°	0.75 mm	Round	Clamp On	6446K734	000000



		303 Stainless Steel with Nickel Bellows

		0.12" × 0.12"	1/4"	35/64"	Not Rated	0.7	0.007"	7°	0.023"	Round	Set Screw	59925K83	000000


		3/16" × 3/16"	3/8"	37/64"	Not Rated	1.6	0.009"	6°	0.03"	Round	Set Screw	59925K88	000000
		3/16" × 3/16"	3/8"	1 3/64"	Not Rated	0.7	0.066"	17°	0.09"	Round	Set Screw	59925K85	000000
		1/4" × 1/4"	1/2"	47/64"	Not Rated	6.1	0.01"	5°	0.038"	Round	Set Screw	59925K92	000000
		1/4" × 1/4"	1/2"	27/32"	Not Rated	4.7	0.018"	9°	0.059"	Round	Set Screw	59925K91	000000
		1/4" × 1/4"	1/2"	1 3/32"	Not Rated	3.1	0.044"	12°	0.082"	Round	Set Screw	59925K89	000000
		1/4" × 1/4"	3/4"	1 3/32"	Not Rated	13.1	0.026"	7°	0.067"	Round	Set Screw	59925K94	000000
		1/4" × 1/4"	3/4"	1 11/32"	Not Rated	9.9	0.046"	9°	0.096"	Round	Set Screw	59925K93	000000
		5/16" × 5/16"	1"	1 1/8"	Not Rated	26.3	0.02"	5°	0.067"	Round	Set Screw	59925K97	000000
		5/16" × 5/16"	1"	1 41/64"	Not Rated	14.2	0.068"	11°	0.149"	Round	Set Screw	59925K96	000000