Acetal Shaft Couplings | McMaster-Carr

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System of Measurement

Shaft Diameter

Shaft Type

Shaft Mount Type

Overall Length

For Shaft Misalignment Type

Construction

Flexible Shaft Coupling Cut Style

Spiral

Clamping Screw Material

Stainless Steel

Steel

Shaft Coupling Flexibility

For Rotary Motion

Maximum Rotation Speed

1,000 rpm

5,000 rpm

10,000 rpm

Angular Misalignment Capability

Length

Maximum Torque

Less than 10,000 in·lbf

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

Yes

Export Control Classification Number (ECCN)

EAR99

REACH

Compliant

Not Compliant

DFARS Specialty Metals

RoHS

Color

Clamping Screw Type

Number of Clamping Screws Included

Parallel Misalignment Capability

124 Products

Clamping Precision Flexible Shaft Couplings

Spiral Cut

Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft. Tighten the clamping screws to secure.

Spiral Cut—Spiral couplings have long cuts in their body for flexibility to handle parallel, axial, and angular misalignment better than parallel couplings. However, they’re not as rigid. Often used for light duty encoder and stepper drive applications, they allow zero backlash (no play) and never need lubrication. They’re also known as helical beam couplings.

Acetal—Acetal couplings are lightweight and corrosion resistant.

						Misalignment Capability
	For Shaft Diameter	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Temp. Range, ° F	For Rotary Motion		Each
Spiral Cut







				Acetal

				1/8" × 1/8"	3/4"	1/2"	5,000	2.1	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K111	0000000


				3/16" × 3/16"	3/4"	1/2"	5,000	2.1	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K113	00000
				3/16" × 1/4"	29/32"	3/4"	5,000	5.6	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K121	00000
				1/4" × 1/4"	29/32"	3/4"	5,000	5.6	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K122	00000
				1/4" × 1/4"	1 1/4"	1"	5,000	12.3	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K131	000000
				1/4" × 3/8"	1 1/4"	1"	5,000	12.3	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K132	000000
				1/4" × 1/2"	1 3/4"	1 1/4"	5,000	22	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K141	000000
				3/8" × 3/8"	1 1/4"	1"	5,000	12.3	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K133	000000
				3/8" × 1/2"	1 3/4"	1 1/4"	5,000	22	0.005"	5°	0 to 140	Forward/Reverse, Start/Stop	2505K142	000000

Electrically Isolating Servomotor Precision Flexible Shaft Couplings

An acetal spacer at the center of these couplings insulates bearings, encoders, and other shaft components from stray electric current. Use them with servomotors, which sometimes generate current that travels down the shaft and can damage circuit boards, interfere with readings, and cause wear on bearing raceways. Like other servomotor couplings, they're good for high speeds, precise positioning, and frequent starts and stops. They have zero backlash, which means they transfer power with no delays or wasted motion. A pair of disc springs—one on each side of the spacer—allow the coupling to flex and accommodate for all types of misalignment. Clamping screws secure both shafts with an even, nonmarring grip.

						Misalignment Capability
	For Shaft Diameter	Overall Lg.	OD	Max. Rotation Speed, rpm	Max. Torque, in·lbf	Parallel	Angular	Axial	For Rotary Motion		Each
Anodized 2024 Aluminum with Acetal Spacer



		1/4" × 1/4"	1 3/16"	3/4"	10,000	6.2	0.004"	2°	0.008"	Forward/Reverse, Start/Stop	3488N11	0000000


		3/8" × 1/4"	1 3/8"	1"	10,000	12.5	0.006"	2°	0.012"	Forward/Reverse, Start/Stop	3488N12	000000
		3/8" × 3/8"	1 3/8"	1"	10,000	12.5	0.006"	2°	0.012"	Forward/Reverse, Start/Stop	3488N13	000000
		3/8" × 3/8"	1 49/64"	1 5/16"	10,000	25	0.008"	2°	0.016"	Forward/Reverse, Start/Stop	3488N15	000000
		1/2" × 1/4"	1 3/8"	1"	10,000	12.5	0.006"	2°	0.012"	Forward/Reverse, Start/Stop	3488N14	000000
		1/2" × 3/8"	1 49/64"	1 5/16"	10,000	25	0.008"	2°	0.016"	Forward/Reverse, Start/Stop	3488N16	000000
		1/2" × 1/2"	1 49/64"	1 5/16"	10,000	25	0.008"	2°	0.016"	Forward/Reverse, Start/Stop	3488N17	000000
		5/8" × 5/8"	2 11/64"	1 5/8"	10,000	45	0.01"	2°	0.02"	Forward/Reverse, Start/Stop	3488N18	000000
		3/4" × 3/4"	2 33/64"	2"	10,000	87	0.012"	2°	0.025"	Forward/Reverse, Start/Stop	3488N19	000000
		8 mm × 5 mm	1 3/16"	3/4"	10,000	6.1	0.003"	2°	0.007"	Forward/Reverse, Start/Stop	3488N2	000000
		8 mm × 8 mm	1 3/16"	3/4"	10,000	6.1	0.003"	2°	0.007"	Forward/Reverse, Start/Stop	3488N21	000000


		10 mm × 10 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N22	000000
		12 mm × 12 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N23	000000
		14 mm × 8 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N27	000000
		14 mm × 10 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N24	000000
		14 mm × 12 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N25	000000
		14 mm × 14 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N26	000000
		16 mm × 16 mm	1 25/32"	1 5/16"	10,000	25	0.007"	2°	0.015"	Forward/Reverse, Start/Stop	3488N28	000000

Rigid Shaft Coupling Covers

Extend the life of your rigid shaft couplings by blocking out dirt, water, lubricants, and other contaminants. These two-piece covers twist together to form a shell around the coupling. Viton® fluoroelastomer O-rings on the threads and around each shaft complete the seal. The outer surface is knurled for a good grip when tightening by hand. Covers are only for use with round, unkeyed shafts.

	For Rotary Motion		Each
Acetal







	For Round Shafts

	1/2" × 1/2"	2 3/16"	1 3/4"	Continuous, Forward/Reverse, Start/Stop	3403N11	000000


	5/8" × 1/2"	2 9/16"	2"	Continuous, Forward/Reverse, Start/Stop	3403N12	00000
	5/8" × 5/8"	2 9/16"	2"	Continuous, Forward/Reverse, Start/Stop	3403N13	00000
	3/4" × 5/8"	2 15/16"	2 1/4"	Continuous, Forward/Reverse, Start/Stop	3403N14	00000
	1" × 3/4"	3 5/16"	2 1/2"	Continuous, Forward/Reverse, Start/Stop	3403N16	00000
	1" × 1"	3 5/16"	2 1/2"	Continuous, Forward/Reverse, Start/Stop	3403N17	00000
	1 1/8" × 1"	3 9/16"	2 5/8"	Continuous, Forward/Reverse, Start/Stop	3403N18	00000
	1 1/8" × 1 1/8"	3 9/16"	2 5/8"	Continuous, Forward/Reverse, Start/Stop	3403N19	00000
	1 1/4" × 1"	3 11/16"	2 3/4"	Continuous, Forward/Reverse, Start/Stop	3403N21	00000
	1 1/4" × 1 1/4"	3 11/16"	2 3/4"	Continuous, Forward/Reverse, Start/Stop	3403N22	00000
	1 1/2" × 1"	4 1/16"	3"	Continuous, Forward/Reverse, Start/Stop	3403N23	000000


	1 1/2" × 1 1/2"	4 1/16"	3"	Continuous, Forward/Reverse, Start/Stop	3403N24	000000
	2" × 2"	5 3/16"	3 3/4"	Continuous, Forward/Reverse, Start/Stop	3403N25	000000

Precision Single U-Joints


Pin-and-Block Joint	Pin-and-Block Joint

A good choice when you need accurate and repeatable motion, these U-joints have zero backlash (no play), so there’s no motion lost when your shafts change direction. This keeps machines running smoothly. They’re single U-joints, so they connect and transfer torque between shafts that are misaligned at an angle.

Your shafts’ misalignment will affect the speed and torque the U-joint will be able to transmit. The more the shafts are misaligned, the less speed and torque the U-joint will be able to transmit.

Pin-and-Block Joint—Pin-and-block U-joints work well in most applications since they handle higher torque at lower speeds than joints with ball bearings.

Acetal—Acetal U-joints weigh less than metal U-joints. They protect components in your system from stray electrical currents by blocking the flow of electricity between your shafts.

Set-Screw Shaft Mount—U-joints that connect with set screws don’t require you to drill any holes.

Spring-Pin Shaft Mount—U-joints that connect with spring pins require you to drill holes through both the U-joint and your shafts. Spring pins are not included.

Lubrication Not Required—U-joints that don’t require lubrication are often used with optical devices and other sensitive equipment because they're less likely to attract dust and debris compared to lubricated U-joints. They’re also easier to maintain.

	For Shaft							Torque
	Dia.	Dp.	Joint Dia.	Overall Lg.	Max. Operating Angle	Max. Rotation Speed, rpm	Max. Torque, in·lbf	5° Operating Angle	10° Operating Angle	Shaft Mount Type	Lubrication		Each
Pin-and-Block Joint







				Acetal

				1/8"	3/8"	5/16"	1.07"	45°	1,000	4	Not Rated	Not Rated	Set Screw	Not Required	60625K84	000000


				3/16"	1/2"	7/16"	1.48"	45°	1,000	17	Not Rated	Not Rated	Set Screw	Not Required	60625K85	00000
				1/4"	5/8"	9/16"	1.82"	45°	1,000	40	Not Rated	Not Rated	Set Screw	Not Required	60625K86	00000
				3/8"	7/8"	11/16"	2.66"	45°	1,000	60	Not Rated	Not Rated	Set Screw	Not Required	60625K87	00000
				1/2"	25/32"	1 1/8"	2 15/16"	40°	1,000	301	Not Rated	Not Rated	Spring Pin	Not Required	6441K16	00000
				5/8"	27/32"	1 7/16"	3 3/8"	40°	1,000	637	Not Rated	Not Rated	Spring Pin	Not Required	6441K17	00000
				3/4"	27/32"	1 7/16"	3 3/8"	40°	1,000	637	Not Rated	Not Rated	Spring Pin	Not Required	6441K18	00000

Plastic Shaft Collars

Lightweight alternatives to metal collars for weight-sensitive applications. Slide these collars from one end of your shaft and tighten the clamping screw. They grip firmly and evenly without marring the shaft, so you can reposition or remove them later.

Acetal—Resist swelling when exposed to moisture.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Acetal



		1/4"	13/16"	3/8"	Socket Head	1	9410T31	000000


		3/8"	1 1/16"	1/2"	Socket Head	1	9410T33	00000
		1/2"	1 1/4"	9/16"	Socket Head	1	9410T34	00000
		5/8"	1 1/2"	5/8"	Socket Head	1	9410T35	00000
		3/4"	1 3/4"	5/8"	Socket Head	1	9410T36	00000
		7/8"	1 7/8"	3/4"	Socket Head	1	9410T37	00000
		1"	2"	3/4"	Socket Head	1	9410T38	00000
		1 1/4"	2 1/4"	3/4"	Socket Head	1	9410T41	00000
		1 1/2"	2 1/2"	3/4"	Socket Head	1	9410T43	00000
		2"	3 1/4"	15/16"	Socket Head	1	9410T45	00000
		3"	4 1/2"	1 1/8"	Socket Head	1	9410T48	00000


		3 mm	16 mm	9 mm	Socket Head	1	3761N115	00000
		4 mm	16 mm	9 mm	Socket Head	1	3761N101	00000
		5 mm	16 mm	9 mm	Socket Head	1	3761N102	00000
		6 mm	16 mm	9 mm	Socket Head	1	3761N103	00000
		7 mm	18 mm	9 mm	Socket Head	1	3761N116	00000
		8 mm	18 mm	9 mm	Socket Head	1	3761N104	00000
		9 mm	24 mm	9 mm	Socket Head	1	3761N117	00000
		10 mm	24 mm	9 mm	Socket Head	1	3761N105	00000
		11 mm	28 mm	11 mm	Socket Head	1	3761N118	00000
		12 mm	28 mm	11 mm	Socket Head	1	3761N106	00000


		14 mm	30 mm	11 mm	Socket Head	1	3761N107	00000
		15 mm	34 mm	13 mm	Socket Head	1	3761N108	00000
		16 mm	34 mm	13 mm	Socket Head	1	3761N109	00000
		17 mm	36 mm	13 mm	Socket Head	1	3761N12	00000
		18 mm	36 mm	13 mm	Socket Head	1	3761N121	00000
		19 mm	40 mm	15 mm	Socket Head	1	3761N122	00000
		20 mm	40 mm	15 mm	Socket Head	1	3761N11	00000
		22 mm	42 mm	15 mm	Socket Head	1	3761N111	00000
		25 mm	45 mm	15 mm	Socket Head	1	3761N112	00000
		28 mm	48 mm	15 mm	Socket Head	1	3761N113	00000


		30 mm	54 mm	15 mm	Socket Head	1	3761N114	00000

Plastic Two-Piece Shaft Collars

Lightweight alternatives to metal two-piece collars for weight-sensitive applications. Attach these collars anywhere along a shaft when other components are already installed or you can't access the ends. They clamp firmly and evenly without marring the shaft, so you can reposition or remove them later.

Acetal—Resist swelling when exposed to moisture.

				Clamping Screw
	For Shaft Dia.	OD	Wd.	Type	No. Included		Each
Acetal



		1/4"	13/16"	3/8"	Socket Head	2	9708T11	000000


		5/16"	13/16"	3/8"	Socket Head	2	9708T12	00000
		3/8"	1 1/16"	1/2"	Socket Head	2	9708T13	00000
		1/2"	1 1/4"	9/16"	Socket Head	2	9708T14	00000
		5/8"	1 1/2"	5/8"	Socket Head	2	9708T15	00000
		3/4"	1 3/4"	5/8"	Socket Head	2	9708T16	00000
		7/8"	1 7/8"	3/4"	Socket Head	2	9708T17	00000
		1"	2"	3/4"	Socket Head	2	9708T18	00000
		1 3/16"	2 1/8"	3/4"	Socket Head	2	9708T19	00000
		1 1/4"	2 1/4"	3/4"	Socket Head	2	9708T21	00000
		1 3/8"	2 3/8"	3/4"	Socket Head	2	9708T22	00000


		1 7/16"	2 1/2"	3/4"	Socket Head	2	9708T23	00000
		1 1/2"	2 1/2"	3/4"	Socket Head	2	9708T24	00000
		1 5/8"	3"	15/16"	Socket Head	2	9708T25	00000
		1 3/4"	3 1/8"	15/16"	Socket Head	2	9708T26	00000
		1 7/8"	3 1/4"	15/16"	Socket Head	2	9708T27	00000
		1 15/16"	3 1/4"	15/16"	Socket Head	2	9708T28	00000
		2"	3 1/4"	15/16"	Socket Head	2	9708T29	00000
		2 1/4"	3 5/8"	15/16"	Socket Head	2	9708T31	00000
		2 1/2"	4"	1 1/8"	Socket Head	2	9708T32	00000
		2 3/4"	4 1/4"	1 1/8"	Socket Head	2	9708T33	00000


		3"	4 1/2"	1 1/8"	Socket Head	2	9708T34	00000
		4 mm	16 mm	9 mm	Socket Head	2	3585N11	00000
		5 mm	16 mm	9 mm	Socket Head	2	3585N12	00000
		6 mm	16 mm	9 mm	Socket Head	2	3585N13	00000
		7 mm	18 mm	9 mm	Socket Head	2	3585N27	00000
		8 mm	18 mm	9 mm	Socket Head	2	3585N14	00000
		9 mm	24 mm	9 mm	Socket Head	2	3585N28	00000
		10 mm	24 mm	9 mm	Socket Head	2	3585N15	00000
		11 mm	28 mm	11 mm	Socket Head	2	3585N29	00000
		12 mm	28 mm	11 mm	Socket Head	2	3585N16	00000


		14 mm	30 mm	11 mm	Socket Head	2	3585N17	00000
		15 mm	34 mm	13 mm	Socket Head	2	3585N18	00000
		16 mm	34 mm	13 mm	Socket Head	2	3585N19	00000
		18 mm	36 mm	13 mm	Socket Head	2	3585N33	00000
		19 mm	40 mm	15 mm	Socket Head	2	3585N34	00000
		20 mm	40 mm	15 mm	Socket Head	2	3585N21	00000
		21 mm	42 mm	15 mm	Socket Head	2	3585N35	00000
		22 mm	42 mm	15 mm	Socket Head	2	3585N22	00000
		23 mm	45 mm	15 mm	Socket Head	2	3585N36	00000
		24 mm	45 mm	15 mm	Socket Head	2	3585N37	00000


		25 mm	45 mm	15 mm	Socket Head	2	3585N23	00000
		26 mm	48 mm	15 mm	Socket Head	2	3585N38	00000
		28 mm	48 mm	15 mm	Socket Head	2	3585N24	00000
		30 mm	54 mm	15 mm	Socket Head	2	3585N25	00000