3" Housing ID Bearings | McMaster-Carr

					Radial Load Cap., lb.		Thrust Load Cap., lb.
	For Shaft Dia.	For Housing ID	Wd.	Bearing Trade No.	Dynamic	Static	Dynamic	Static	Max. Rotation Speed, rpm	Lubrication	Temp. Range, ° F		Each
For Combined Radial and Thrust Load—Open with Steel Ring



		1 7/16"	3"	15/16"	31597/31521	5,500	24,100	3,800	28,200	2,800	Required	-60 to 200	00000000	0000000


		1 1/2"	3"	3/4"	2788/2720	4,650	23,000	2,400	20,300	2,800	Required	-60 to 200	0000000	00000

Four-Point Angular Contact Ball Bearings

Support complex movement in multiple directions with a single compact bearing. The balls distribute weight at four points, so these bearings handle radial, thrust, and moment loads all at once. For example, you’ll often find them in robot arms, which rotate, extend, and twist while supporting an object’s weight. Thinner than two standard angular contact ball bearings paired together, these bearings squeeze into tight spaces. They’re commonly paired with large hollow shafts to run electrical wire and other lines.

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.

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.

					Dynamic Load Cap.					Temp. Range, ° F
	For Shaft Dia.	For Housing ID	Wd.	ABEC Rating	Radial, lb.	Thrust, lb.	Moment, ft·lbf	Max. Rotation Speed, rpm	Contact Angle	Min.	Max.	Inner Ring Type		Each
Open







				Steel

				2 1/2"	3"	1/4"	1F	580	910	50	1,200	30°	-60	250	Standard	0000000	0000000

Oil-Embedded Sleeve Bearings

Install and forget these self-lubricating bearings. All are made from porous metal and saturated with oil to reduce maintenance and downtime. A good all-around choice, they are used in everything from palm-sized fans in electronics to tire-sized pulleys. Although these bearings will work in most conditions, oil may drip away if temperatures get too high. Consider a graphite-lubricated bearing for higher temperatures or places where you can’t afford the mess. All are fabricated, lubricated, 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.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

High-Load 863 Iron Copper—Iron makes these bearings harder, stronger, and more resistant to sudden starts and stops than 841 bearing bronze. However, they operate at slower speeds. The increased iron content makes these bearings appear silver.

Mineral Oil Base—Mineral oil consistently lubricates at most temperatures but doesn’t last as long as synthetic oil.

Synthetic Oil Base—A high-quality lubricant makes all the difference. Synthetic oil is less sensitive to temperature changes than mineral oil, so it won't get runny and leak away at higher temperatures.

	For Housing ID	Lg.	Dynamic Radial Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	2 1/2"	3"	2"	10,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	00000000	000000


	2 1/2"	3"	2 1/2"	12,500 lb. @ 30 rpm	Synthetic Oil	-35 to 300	00000000	00000
	2 1/2"	3"	3"	15,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	00000000	00000
	2 1/2"	3"	4"	20,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	00000000	000000
	2 3/4"	3"	1 1/2"	8,250 lb. @ 30 rpm	Synthetic Oil	-35 to 300	00000000	00000
	2 3/4"	3"	2 1/2"	13,750 lb. @ 30 rpm	Mineral Oil	10 to 220	0000000	00000


	High-Load 863 Iron Copper



			2 1/2"	3"	4"	17,800 lb. @ 30 rpm	Synthetic Oil	-15 to 300	00000000	00000

Precision Needle-Roller Bearings


	Bearing

Install these bearings directly onto hardened and ground shafts. They have higher load capacity, speed, and accuracy than standard needle-roller bearings.

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.

Shaft Liners—Shaft liners allow you to use the bearing on unhardened and unground shafts.

	Roller Bearings												Shaft Liners
				Radial Load Cap., lb.
	For Shaft Dia.	For Housing ID	Wd.	Dynamic	Static	Max. Rotation Speed, rpm	Lubrication	For Shaft Surface Smoothness, Ra, μin	Temp. Range, ° F	Features		Each	For Shaft Dia.		Each
For Radial Load—Open with Steel Ring



		2 1/4"	3"	1 1/2"	15,100	33,200	5,900	Required	16	0 to 245	Lubrication Groove, Lubrication Hole	00000000	000000	1 3/4"	00000000	000000


		For Radial Load—Sealed with Steel Ring



				2 1/4"	3"	1 3/4"	15,100	33,200	1,700	Required	16	-30 to 250	Lubrication Groove, Lubrication Hole	00000000	000000	1 3/4"	00000000	00000

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



	2 1/2"	3"	4"	38,150 lb. @ 30 rpm	-350 to 450	00000000	000000


	2 1/2"	3"	5"	47,700 lb. @ 30 rpm	-350 to 450	00000000	00000

High-Temperature Graphite-Lubricated Sleeve Bearings

Made of a graphite and metal alloy, these bearings stay slippery at high temperatures where oil burns off and other bearings fail. With no need for refills, they require little to no maintenance. You’ll find them in pumps, propellers, and mixers that spin near steam or inside ovens. However, graphite may eventually flake off, dropping flecks and leaving smudges. If you need a spic-and-span space, consider dry-running bearings made of slippery plastic instead. All are fabricated, lubricated, 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.

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID	Lg.	Dynamic Radial Load Cap. @ Speed	Temp. Range, ° F		Each
841 Bearing Bronze



	2 1/2"	3"	4"	16,000 lb. @ 30 rpm	-50 to 700	00000000	0000000