90mm Housing ID Bearings

Smoother than smooth—the balls inside these bearings roll nearly friction-free. You’ll often find them on rapidly rotating parts, from the whirring chuck on a power drill to the spinning shaft on an electric motor.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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.

Corrosion-Resistant 440C Stainless Steel—Combine the strength of steel with the corrosion resistance of stainless steel. These bearings won't degrade from water or mild chemicals, such as the ammonia in cleaning solutions. However, they'll weaken when exposed to salt water and harsh chemicals, such as bleach.

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	Min.	Max.	Inner Ring Type	Bearing Trade No.		Each
Open







				Steel

				40	90	23	1	9,550	10,800	-20	230	Standard	6308	5972K124	000000


				50	90	20	1	6,650	7,100	-20	230	Standard	6210	5972K129	00000
				70	90	10	1	2,700	8,100	-50	130	Standard	6814	6656K153	00000


				Shielded







								Steel

								40	90	23	1	9,550	7,500	-20	230	Standard	6308-2Z	5972K355	00000


								40	90	23	3	9,500	8,500	-20	230	Standard	6308-2Z	6661K69	000000
								50	90	20	1	6,650	7,100	-20	230	Standard	6210-2Z	5972K366	00000
								50	90	20	3	8,300	8,000	-20	230	Standard	6210-2Z	6661K52	000000
								55	90	18	1	6,700	9,100	-20	230	Standard	6011-2Z	5972K273	000000
								55	90	18	3	6,650	8,000	-20	230	Standard	6011-2Z	4481N21	000000
								70	90	10	1	2,700	6,800	-40	150	Standard	6814-2Z	6656K241	00000


								Sealed







												Steel

												40	90	23	1	9,550	4,800	-20	230	Standard	6308-2RS	5972K61	00000


												40	90	23	3	9,500	5,000	-30	210	Standard	6308-2RS	6661K129	000000
												50	90	20	1	8,200	4,300	-20	230	Standard	6210-2RS	5972K52	00000
												50	90	20	3	8,300	4,800	-30	210	Standard	6210-2RS	6661K112	000000
												55	90	18	1	6,700	4,100	-20	230	Standard	6011-2RS	5972K235	000000
												55	90	18	3	6,650	5,000	-30	210	Standard	6011-2RS	4481N67	000000




														Corrosion-Resistant 440C Stainless Steel

														50	90	20	1	7,850	4,500	-20	210	Standard	6210-2RS	6138K113	000000


55														90	18	1	6,350	4,200	-20	210	Standard	6011-2RS	6138K114	000000

Angular Contact Ball Bearings


Single Row Open	Single Row Sealed	Double Row Open	Double Row Shielded	Double Row Sealed

Support radial and thrust loads at the same time. These bearings are often found inside equipment such as gearboxes and pumps. For example, a bearing inside a gearbox withstands a radial load when the gear is engaged and a momentary thrust load when you shift to a new one. While they don't handle as much force from radial loads as standard bearings, you can pair them with a cylindrical roller bearing to increase their load capacity.

Single Row—Single-row bearings withstand thrust loads from one direction.

Double Row—Double-row bearings handle thrust loads from both directions.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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.

										Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Material	Dynamic Combined Load Cap., lbf	Max. Rotation Speed, rpm	Lubrication	Contact Angle	Min.	Max.	Bearing Trade No.		Each
Single Row







				Open

				40	90	23	3	Steel	10,300	9,000	Required	40°	-40	300	7308	6680K31	0000000


				50	90	20	3	Steel	8,450	8,500	Required	40°	-40	300	7210	6680K22	000000




						Sealed

						40	90	23	1	Steel	11,900	4,500	Lubricated	40°	-20	230	7308-2RS	6680K49	000000


						Double Row







										Open

										50	90	30.2	3	Steel	11,400	7,000	Required	30°	-40	250	3210	8828T121	000000




												Shielded

												50	90	30.2	3	Steel	11,400	7,000	Lubricated	30°	-40	300	3210-2Z	8828T221	000000




														Sealed

														50	90	30.2	3	Steel	11,400	4,800	Lubricated	30°	-40	210	3210-2RS	8828T321	000000

Spherical-Roller Bearings

Two rows of rollers give these bearings dynamic radial load capacities over five times higher than comparably sized tapered-roller bearings. Also known as rock crusher bearings, they handle heavy shock loads and are used for metal milling machinery, mining and oil field equipment, and in paper mills.

						Combined Load Cap., lbf
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Bearing Trade No.	Ring Material	Dynamic	Static	Max. Rotation Speed, rpm	Lubrication	Max. Temp., ° F		Each
Open Bearing



		40	90	33	22308	Steel	35,000	33,400	7,600	Required	212	2721T26	0000000


		50	90	23	22210	Steel	24,500	24,000	9,800	Required	212	2721T21	000000

Permanently Lubricated Ball Bearings

Install and forget these self-lubricating bearings. Their lubricant is a solid material that fills the space between the balls and releases oil over time, so you'll never need to add more.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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.

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







				Steel

				40	90	23	1	7,050	4,600	10	200	Standard	6308	2349K719	000000


				50	90	20	1	6,050	4,000	10	200	Standard	6210	2349K708	00000


				Sealed







								Steel

								40	90	23	1	7,050	4,600	10	200	Standard	6308-2RS	2349K775	00000


								50	90	20	1	6,050	4,000	10	200	Standard	6210-2RS	2349K763	00000
								55	90	18	1	4,900	4,000	10	200	Standard	6011-2RS	2349K752	000000




										Corrosion-Resistant 440C Stainless Steel

										50	90	20	1	6,050	4,000	-10	200	Standard	6210-2RS	4668K336	000000

Quick-Mount Ball Bearings

Set-Screw

Shaft Mount

Slip onto a shaft and secure with the turn of a screw. You don't need any special tools to mount these bearings.

Set-Screw Shaft Mount—Tighten the screws against the shaft to hold the bearing in place. For high-speed applications, consider clamp-on shaft mounts, which are less likely to slip.

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

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.

				Retaining Ring, mm						Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	OD	Thk.	Bearing Seal Type	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Min.	Max.	Bearing Trade No.		Each
Set-Screw Shaft Mount







				Black-Oxide Steel

				50	90	28.6	96	2.4	Sealed	1	7,850	3,550	-20	220	ER210	5629N17	0000000

High-Precision Angular Contact Ball Bearings

Open

Sealed

Our most precise bearings for tackling radial and thrust loads at once, with tolerances tighter than a speck of dust. Rated ABEC 7 out of 9, they meet strict tolerance standards established by the Annular Bearing Engineers Committee (ABEC). Choose them for equipment that requires both high speed and pinpoint accuracy, such as machine tool spindles. For example, a bearing on a spindle withstands a radial load as it spins at high speeds and a thrust load when the cutting tool touches the workpiece. These bearings don’t handle as much force from radial loads as standard ones, but you can pair them with a cylindrical roller bearing to increase their load capacity.

Single Row—Single-row bearings withstand thrust loads from one direction.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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.

										Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Material	Dynamic Combined Load Cap., lbf	Max. Rotation Speed, rpm	Lubrication	Contact Angle	Min.	Max.	Bearing Trade No.		Each
Single Row







				Open

				50	90	20	7	Steel	10,100	16,500	Required	15°	-40	245	7210	4487N31	0000000




						Sealed

						55	90	18	7	Steel	8,050	15,900	Lubricated	15°	0	230	7011	4487N16	00000000

Electrical Insulating Ball Bearings

Shielded

Protect bearings from stray currents. The ceramic balls insulate bearings from electrical charges in electric motors and power generators that can damage the inner ring over time. The balls also generate less heat than metal ones, so you don’t have to lubricate them as often to keep bearings running smoothly.

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

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

							Temp. Range, ° F			Ceramic Balls
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Min.	Max.	Bearing Trade No.		Each
Shielded







				Steel

				40	90	23	1	11,400	11,000	-20	245	6308-2Z	1389N57	0000000


				50	90	20	1	9,600	10,800	-20	245	6210-2Z	1389N42	000000

Sleeve Bearings

These bearings don’t come with a lubricant, so you can select the oil that meets the needs of your application. You’ll need to refill the oil, so make sure the bearing is located where you can access it. All are fabricated and inspected in the U.S.

With no moving parts, sleeve bearings are the simplest way to support the load of a rotating shaft while reducing friction. Also known as plain bearings.

High-Load 932 Bearing Bronze—These bearings are strong enough for sudden starts and stops, plus they resist wear and tear. They are cast from an alloy of leaded tin bronze for uniform rigidity and strength. Also known as 660 leaded bronze bearings.

	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Temp. Range, ° F		Each
High-Load 932 Bearing Bronze



	75	90	100	37,550 lb. @ 30 rpm	-350 to 450	7811K325	000000

Self-Aligning Ball Bearings

Open

Misalignments correct themselves on the fly in these bearings. Two rows of balls have separate raceways in the inner ring and a shared raceway in the outer ring, so the balls rock back and forth to compensate for misalignment. This construction also reduces noise and vibration.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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

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







				Steel

				40	90	23	1	6,650	6,700	4°	Not Rated	210	Standard	1308	6660K335	0000000

High-Load Crossed-Roller Bearings

The thicker inner and outer raceways on these bearings can handle heavier loads than the thin-profile crossed-roller bearings. The rollers face in alternating directions to allow for rigid, accurate motion under any combination of radial, thrust, and moment (twisting) loads. Use in applications where highly accurate motion is necessary, such as machine tools and industrial robots.

Open Bearing—Open bearings dissipate heat more efficiently than sealed bearings.

Sealed Bearing—Sealed bearings block out dust and other contaminants better than open bearings, but retain more heat.

				Combined Load Cap., lbf
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Dynamic	Static	Max. Rotation Speed, rpm	Lubrication	Temp. Range, ° F	Features		Each
For Combined Radial, Thrust, and Moment Load—Open with Steel Ring



		60	90	13	4,200	5,450	1,000	Required	0 to 230	Lubrication Groove, Two Lubrication Holes	1378N12	0000000


		For Combined Radial, Thrust, and Moment Load—Sealed with Steel Ring



				60	90	13	4,200	5,400	800	Lubricated	0 to 210	Lubrication Groove, Two Lubrication Holes	1378N22	000000