Sprag Bearings | McMaster-Carr

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Shaft Diameter

Width

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Bearing Trade Number

Material

Shaft Mount Type

Maximum Torque

100 ft·lbf to 199 ft·lbf

200 ft·lbf to 249 ft·lbf

250 ft·lbf to 999 ft·lbf

1,000 ft·lbf or greater

For Housing ID

Maximum Rotation Speed

Shaft Type

Bearing Type

Cage Material

Dynamic Radial Load Capacity

Less than 1,000 lb.

1,000 lb. to 1,499 lb.

1,500 lb. to 1,999 lb.

2,000 lb. to 2,499 lb.

Performance

Spring Material

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

Yes

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

1C999

EAR99

DFARS Specialty Metals

RoHS

Torque

100 ft·lbf to 199 ft·lbf

200 ft·lbf to 249 ft·lbf

250 ft·lbf to 999 ft·lbf

1,000 ft·lbf or greater

Rotation Speed

Less than 2,000 rpm

2,000 rpm to 3,999 rpm

4,000 rpm to 9,999 rpm

10,000 rpm to 19,999 rpm

20,000 rpm or greater

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86 Products

One-Way-Locking Ball Bearings

Prevent shafts from reversing direction. These bearings have internal components (sprags) that lock against the outer ring to transmit torque one way but spin freely in the other. They're often found in backstopping, indexing, and overrunning applications. For example, they're used to prevent conveyors from reversing.

Shielded—The balls are covered just enough to keep out large particles while allowing air to pass through and dissipate heat.

Sealed—The best choice for dirty environments. A barrier seals out dust so it won't gunk up or wear down the balls. However, these bearings retain the most heat since air can't flow through.

Steel—Strong and wear resistant. However, these bearings are best for dry environments since moisture will cause them to rust.

ABEC Rating—Bearings with an ABEC rating meet industry tolerance standards established by the Annular Bearing Engineers Committee (ABEC). They're rated on a scale from 1 to 9. The higher the rating, the tighter the tolerance. Bearings rated ABEC 1 or 3 are precise enough for most applications. If your application consistently runs at high speeds or requires high accuracy, consider bearings rated ABEC 5 or higher, since they generate less friction and heat.

								Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Max. Torque, ft·lbf	Min.	Max.	Inner Ring Type	Bearing Trade No.		Each
Shielded







				Steel

				8	22	9	1	720	15,000	1.5	-40	170	Standard	608-2Z	4752N11	0000000


				12	32	10	1	1,150	10,000	6.5	-40	170	Standard	FZ 6201	4752N22	000000
				15	35	11	1	1,160	9,400	15	-40	170	Standard	FZ 6202	4752N32	000000
				17	40	12	1	1,270	8,200	23	-40	170	Standard	FZ 6203	4752N42	000000
				20	47	14	1	1,540	6,800	64	-40	170	Standard	FZ 6204	4752N52	000000
				25	52	15	1	1,620	5,600	70	-40	170	Standard	FZ 6205	4752N62	000000
				30	62	16	1	1,730	4,000	165	-40	170	Standard	FZ 6206	4752N72	000000
				35	72	17	1	1,830	3,600	240	-40	170	Standard	FZ 6207	4752N82	000000
				40	80	22	1	2,010	3,000	305	-40	170	Standard	FZ 6208	4752N92	000000


				Sealed







								Steel

								12	32	14	1	1,150	10,000	6.5	-40	170	Standard	FZ 6201 2RS	4752N23	000000


								15	35	16	1	1,160	8,400	15	-40	170	Standard	FZ 6202 2RS	4752N24	000000
								17	40	17	1	1,270	7,300	23	-40	170	Standard	FZ 6203 2RS	4752N25	000000
								20	47	19	1	1,540	6,000	64	-40	170	Standard	FZ 6204 2RS	4752N26	000000
								25	52	20	1	1,620	5,200	70	-40	170	Standard	FZ 6205 2RS	4752N27	000000
								30	62	21	1	1,730	4,200	165	-40	170	Standard	FZ 6206 2RS	4752N28	000000
								35	72	22	1	1,830	3,600	240	-40	170	Standard	FZ 6207 2RS	4752N29	000000
								40	80	27	1	2,010	3,000	305	-40	170	Standard	FZ 6208 2RS	4752N33	000000

One-Way Locking Needle-Roller Bearing Clutches

The needles in these bearings roll freely in one direction, but lock to transmit torque when the rotation of the shaft is reversed. Also known as drawn-cup roller clutches. An arrow on the lip indicates the rotational direction that locks the bearings.

Single-Row Bearing—Single-row bearings do not support loads from any direction. To support radial loads, use with our Needle-Roller Bearings.

Triple-Row Bearing—Triple-row bearings support radial loads.

301 Stainless Steel Springs—Bearings with 301 stainless steel springs handle higher temperatures than bearings with acetal springs.

					Radial Load Cap., lb.
	For Shaft Dia.	For Housing ID	Wd.	Ring Material	Dynamic	Static	Max. Rotation Speed, rpm	Max. Torque, ft·lbf	Lubrication	For Shaft Surface Smoothness, Ra, μin	Temp. Range, ° F		Each
Single-Row Bearing







				Acetal Springs

				1/8"	9/32"	1/4"	Steel	—	—	34,000	0.2	Required	16	-20 to 200	2489K21	000000


				1/4"	7/16"	1/2"	Steel	—	—	20,000	1.5	Required	16	-20 to 200	2489K22	00000
				3/8"	5/8"	1/2"	Steel	—	—	18,000	4	Required	16	-20 to 200	2489K23	00000
				1/2"	3/4"	1/2"	Steel	—	—	17,000	6.5	Required	16	-20 to 200	2489K24	00000
				5/8"	7/8"	5/8"	Steel	—	—	14,000	12	Required	16	-20 to 200	2489K5	00000
				3/4"	1"	5/8"	Steel	—	—	12,000	17	Required	16	-20 to 200	2489K6	00000
				1"	1 5/16"	5/8"	Steel	—	—	8,700	35	Required	16	-20 to 200	2489K7	00000




						301 Stainless Steel Springs

						1/4"	7/16"	1/2"	Steel	—	—	20,000	1.5	Required	16	-20 to 250	2489K28	00000


						3/8"	5/8"	1/2"	Steel	—	—	18,000	4	Required	16	-20 to 250	2489K29	00000
						1/2"	3/4"	1/2"	Steel	—	—	17,000	6.5	Required	16	-20 to 250	2489K31	00000
						5/8"	7/8"	5/8"	Steel	—	—	14,000	12	Required	16	-20 to 250	2489K12	00000
						3/4"	1"	5/8"	Steel	—	—	12,000	17	Required	16	-20 to 250	2489K13	00000
						1"	1 5/16"	5/8"	Steel	—	—	8,700	35	Required	16	-20 to 250	2489K14	00000




								Steel Springs

								6 mm	10 mm	12 mm	Steel	—	—	23,000	1.3	Required	16	10 to 150	6392K41	00000


								8 mm	12 mm	12 mm	Steel	—	—	17,000	2.3	Required	16	10 to 150	6392K42	00000
								10 mm	14 mm	12 mm	Steel	—	—	14,000	3.9	Required	16	10 to 150	6392K43	00000
								12 mm	18 mm	16 mm	Steel	—	—	11,000	9	Required	16	10 to 150	6392K44	00000
								14 mm	20 mm	16 mm	Steel	—	—	9,500	12	Required	16	10 to 150	6392K45	00000
								16 mm	22 mm	16 mm	Steel	—	—	8,500	15	Required	16	10 to 150	6392K46	00000
								18 mm	24 mm	16 mm	Steel	—	—	7,500	17	Required	16	10 to 150	6392K47	00000
								20 mm	26 mm	16 mm	Steel	—	—	7,000	21	Required	16	10 to 150	6392K48	00000
								25 mm	32 mm	20 mm	Steel	—	—	5,500	45	Required	16	10 to 150	6392K49	00000
								30 mm	37 mm	20 mm	Steel	—	—	4,500	65	Required	16	10 to 150	6392K51	00000
								35 mm	42 mm	20 mm	Steel	—	—	3,900	85	Required	16	10 to 150	6392K52	00000


								Triple-Row Bearing







												301 Stainless Steel Springs

												3/8"	5/8"	7/8"	Steel	1,350	1,100	18,000	4	Required	16	-20 to 250	1553N21	00000


1/2"	3/4"											7/8"	Steel	1,600	1,450	17,000	6.5	Required	16	-20 to 250	1553N22	00000
5/8"	7/8"											1"	Steel	1,800	1,800	14,000	12	Required	16	-20 to 250	1553N23	00000
3/4"	1"											1"	Steel	2,000	2,200	12,000	17	Required	16	-20 to 250	1553N24	00000
1"	1 5/16"	1.063"										Steel	3,450	3,950	8,700	35	Required	16	-20 to 250	1553N25	00000
8 mm	14 mm	20 mm	Steel									940	680	21,000	3.2	Required	16	-20 to 250	1553N11	00000
10 mm	16 mm	20 mm	Steel									1,050	850	19,000	4.2	Required	16	-20 to 250	1553N12	00000
12 mm	18 mm	26 mm	Steel									1,400	1,300	19,000	10	Required	16	-20 to 250	1553N13	00000
16 mm	22 mm	26 mm	Steel									1,450	1,600	14,000	16	Required	16	-20 to 250	1553N14	00000
20 mm	26 mm	26 mm	Steel									1,800	2,100	11,000	24	Required	16	-20 to 250	1553N15	00000
25 mm	32 mm	30 mm	Steel									2,500	2,900	8,700	50	Required	16	-20 to 250	1553N16	00000


30 mm	37 mm	30 mm	Steel									2,550	3,350	7,300	70	Required	16	-20 to 250	1553N17	000000

One-Way Clutches

Since they transfer torque in one direction and spin freely in the other, these clutches are useful in applications where you don’t want motion to reverse, such as in backstopping, indexing, and overrunning. For example, they can be used to prevent a conveyor from reversing direction.

When choosing a clutch, consider how much torque you need to transfer. You should also consider how the clutch will attach to your mounted component.

Roller Engagement—Knurled Hub

Roller clutches are best for low- to medium-torque transfer in overrunning and indexing applications.

Clutches with a knurled hub can be press fit into the bore of your component.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Set-Screw Shaft Mount—Clutches that mount to shafts with set screws bite into your shaft when tightened to hold it.

								Shaft		Hub		Clockwise Drive		Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type	Dia.	Lg.		Each		Each
Through Shaft



		1/4"	Round	0.83	5,000	15/16"	31/32"	Steel	—	Set Screw	5/8"	9/32"	4550N41	0000000	4550N42	0000000


		3/8"	Keyed	1.25	5,000	1 3/16"	1"	Steel	3/32" × 3/64"	Set Screw	9/16"	3/8"	4550N43	000000	4550N44	000000
		1/2"	Keyed	4.16	2,000	1 1/2"	1 9/32"	Steel	1/8" × 1/16"	Set Screw	7/8"	1/2"	4550N45	000000	4550N46	000000

Roller Engagement—Keyed Hub

Roller clutches are best for low- to medium-torque transfer in overrunning and indexing applications.

Clutches with a keyed hub let you slip on your component.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Slip-Fit Shaft Mount—Clutches that mount to shafts with a slip fit must be secured with a shaft collar or in some other way that prevents them from moving along the length of your shaft.

								Shaft		Hub			Clockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type	Dia.	Lg.	Keyway Wd. × Keyway Dp.		Each
Through Shaft



		1/4"	Keyed	5	1,800	1 5/8"	1 15/16"	Steel	1/16" × 1/32"	Slip Fit	7/8"	13/16"	3/16" × 3/32"	4550N11	0000000


		3/8"	Keyed	14	1,800	2"	2 1/8"	Steel	3/32" × 3/64"	Slip Fit	1 1/4"	1"	3/16" × 3/32"	4550N12	000000
		1/2"	Keyed	14	1,800	2"	2 1/8"	Steel	1/8" × 1/16"	Slip Fit	1 1/4"	1"	3/16" × 3/32"	4550N13	000000
		5/8"	Keyed	28	1,500	2 5/8"	2 23/32"	Steel	3/16" × 3/32"	Slip Fit	1 3/8"	1 5/16"	3/16" × 3/32"	4550N14	000000
		3/4"	Keyed	100	1,000	3 5/8"	3 11/32"	Steel	3/16" × 3/32"	Slip Fit	2 1/4"	1 1/2"	3/8" × 3/16"	4550N15	000000
		1"	Keyed	100	1,000	3 5/8"	3 11/32"	Steel	1/4" × 1/8"	Slip Fit	2 1/4"	1 1/2"	3/8" × 3/16"	4550N16	000000
		1 1/4"	Keyed	100	1,000	3 5/8"	3 11/32"	Steel	1/4" × 1/8"	Slip Fit	2 1/4"	1 1/2"	3/8" × 3/16"	4550N17	000000
		1 1/2"	Keyed	200	800	4 1/2"	4 1/2"	Steel	3/8" × 3/16"	Slip Fit	3"	2 1/16"	3/8" × 3/16"	4550N18	000000

Sprag Engagement—Keyed Hub

Sprag clutches handle higher torque than roller clutches because they have more contact points. This makes them best for backstopping applications.

Clutches with a keyed hub let you slip on your component.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Set-Screw Shaft Mount—Clutches that mount to shafts with set screws bite into your shaft when tightened to hold it.

				Max. Rotation Speed, rpm					Shaft		Hub			Clockwise Drive		Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Inner-Race	Outer-Race	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type	Dia.	Lg.	Keyway Wd. × Keyway Dp.		Each		Each
Through Shaft



		5/8"	Keyed	110	1,950	900	2"	2 3/4"	Steel	3/16" × 3/32"	Set Screw	1 1/4"	1"	3/16" × 3/32"	4550N32	000000000	4550N31	000000000


		3/4"	Keyed	300	1,950	750	2.88"	3.19"	Steel	3/16" × 3/32"	Set Screw	1 3/8"	1 5/16"	3/16" × 3/32"	4550N34	00000000	4550N33	00000000
		1"	Keyed	450	1,650	600	3 1/4"	3.56"	Steel	1/4" × 1/8"	Set Screw	1 3/4"	1 7/16"	1/4" × 1/8"	4550N36	00000000	4550N35	00000000
		1 1/4"	Keyed	675	1,250	350	3 3/4"	3 1/2"	Steel	5/16" × 5/32"	Set Screw	2 1/4"	1 7/16"	5/16" × 5/32"	4550N38	00000000	4550N37	00000000

Sprag Engagement—Flush Hub


	Covers


Torque Arm Shown Installed	Torque Arms

Sprag clutches handle higher torque than roller clutches because they have more contact points. This makes them best for backstopping applications.

Clutches with a flush hub have a precision ground outer race, so they can be press fit directly into a component and positioned anywhere along the length of your shaft. They also have mounting holes on their face you can use to secure your component or an anti-rotation device, such as a torque arm, for a different backstopping setup.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Slip-Fit Shaft Mount—Clutches that mount to shafts with a slip fit must be secured with a shaft collar or in some other way that prevents them from moving along the length of your shaft.

Covers—Covers protect you from rotating equipment when the clutch is mounted to the end of the shaft.

Torque Arms—Clutch torque arms work as an anchor for clutches in backstopping applications. Mount to the outer race of your clutch and a stationary piece of equipment.

	Clutches												Covers		Torque Arms
				Max. Rotation Speed, rpm					Shaft		Clockwise or Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Inner-Race	Outer-Race	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type		Each		Each		Each
Through Shaft



		3/4"	Keyed	300	2,800	850	3 1/2"	2 3/4"	Steel	3/16" × 3/32"	Slip Fit	4550N21	000000000	4550N201	0000000	4550N301	0000000


		1"	Keyed	1,175	2,500	800	4 1/4"	3 1/2"	Steel	1/4" × 1/8"	Slip Fit	4550N22	00000000	4550N202	000000	4550N302	000000
		1 1/4"	Keyed	1,175	2,500	800	4 1/4"	3 1/2"	Steel	1/4" × 1/8"	Slip Fit	4550N23	00000000	4550N202	000000	4550N302	000000
		1 1/2"	Keyed	2,250	2,200	750	5 3/8"	3 3/4"	Steel	3/8" × 3/16"	Slip Fit	4550N24	00000000	4550N203	000000	4550N303	000000
		1 3/4"	Keyed	2,250	2,200	750	5 3/8"	3 3/4"	Steel	3/8" × 3/16"	Slip Fit	4550N25	00000000	4550N203	000000	4550N303	000000