2 3/4" Bearings | McMaster-Carr

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System of Measurement

Shaft Diameter

Bearing Type

For Load Direction

Combined Radial and Thrust

Material

Bearing Trade Number

Length

Dynamic Thrust Load Capacity

Less than 10,000 lb.

10,000 lb. to 19,999 lb.

Static Radial Load Capacity

Less than 10,000 lb.

10,000 lb. to 99,999 lb.

Bearing Seal Type

Mounted Bearing Type

For Housing ID

Width

Thickness

Ball Material

Maximum Rotation Speed

Bearing Construction

Shaft Type

Dynamic Radial Load Capacity

Less than 10,000 lb.

10,000 lb. to 19,999 lb.

RoHS

REACH

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

25 Products

Tapered-Roller Bearings

Found anywhere from machine tool spindles to conveyor rollers, these bearings have a two-piece design that allows for adjustment.

					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



		2 3/4"	4 7/16"	3/4"	29675/29620	5,950	37,200	4,950	52,800	1,600	Required	-60 to 200	5709K451	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.

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 3/4"	3"	1 1/2"	8,250 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K846	000000


	2 3/4"	3"	2 1/2"	13,750 lb. @ 30 rpm	Mineral Oil	10 to 220	6391K89	00000
	2 3/4"	3 1/8"	2 3/4"	15,100 lb. @ 30 rpm	Mineral Oil	10 to 220	6391K892	00000
	2 3/4"	3 1/8"	4"	22,000 lb. @ 30 rpm	Mineral Oil	10 to 220	6391K893	000000
	2 3/4"	3 1/4"	1 1/2"	8,250 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K847	00000
	2 3/4"	3 1/4"	2"	11,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K692	00000
	2 3/4"	3 1/4"	3"	16,500 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K693	00000
	2 3/4"	3 1/4"	4"	22,000 lb. @ 30 rpm	Mineral Oil	10 to 220	6391K894	000000

Mounted Ball Bearings

Smoother than smooth—the balls inside these bearings roll nearly friction-free. The sturdy housing bolts down to support shafts as they turn.

Lubricate regularly to keep your bearing in tip-top shape. Bearings with seals and shields keep lubricants in and contaminants out, and come packed with grease. Open bearings require initial lubrication and offer less protection against dust and debris.

Nickel-Plated Cast Iron Housing—Combine the strength of iron with the corrosion resistance of stainless steel at an affordable price point. Nickel-plated iron is also unlikely to chip.

Set Screw—Turn the screw to lock your shaft in place. A simple, reliable choice, set screws grip tightly, but they can mar shaft surfaces.

Misalignment Capability—Bearings compensate for as much shaft misalignment as the degree listed. This extends the life of the bearing and protects against wear if shafts are slightly askew.

			Overall
	For Shaft Dia.	Ctr. Ht.	Lg.	Wd.	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Bearing Material	Bearing Seal Type	Misalignment Capability	Manufacturer		Each
Nickel-Plated Cast Iron Housing







				Set Screw

				2 3/4"	3 1/8"	10 15/32"	3 5/32"	13,950	2,000	Steel	Sealed	2°	McMaster-Carr Approved	6494K87	0000000

Oil-Embedded Flanged Sleeve Bearings

Flanged sleeve bearings combine a sleeve and thrust bearing in one. The flange supports thrust loads and prevents the bearing from being pushed out of place. The sleeve is 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.	Flange OD	Flange Thk.	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	2 3/4"	3 1/4"	1 1/2"	4"	3/16"	8,250 lb. @ 30 rpm	10,500 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6338K614	000000

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.

				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 Radial Load—Open with Steel Ring



		2 3/4"	3 1/2"	1 1/2"	16,400	39,600	4,800	Required	16	0 to 245	Lubrication Groove, Lubrication Hole	7929K204	000000


		For Radial Load—Sealed with Steel Ring



				2 3/4"	3 1/2"	1 3/4"	16,300	39,600	1,400	Required	16	-30 to 250	Lubrication Groove, Lubrication Hole	8258K104	000000

One-Piece Thrust Ball Bearings

No need to assemble cages and washers—these thrust ball bearings come as one piece for easy installation. The balls spin inside a raceway instead of a cage, so there's room for more balls to support higher loads than three-piece bearings. An outer band holds the balls inside the raceway, keeping lubricant in and dirt out.

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

	OD	Thk.	Cage Material	Dynamic Thrust Load Cap., lb.	Max. Rotation Speed, rpm	Temp. Range, ° F		Each
Steel



	2 3/4"	4 15/32"	1"	Steel	18,200	1,600	-40 to 245	60715K53	0000000

Mounted Tapered-Roller Bearings

Support heavier loads than mounted ball or needle-roller bearings, but at lower speeds. These bearings also withstand thrust loads, which are forces acting parallel to the shaft. The sturdy housing bolts down to support shafts as they turn.

Lubricate your bearings regularly to keep them in tip-top shape. These bearings come packed with grease and sealed to block out dust and contaminants.

Powder-Coated Cast Iron Housing—A rugged iron base coated in thick powder that protects against water, mild detergents, and oil. However, if the coating is scratched or chipped, the underlying iron may rust.

Set Screw—Turn the screw to lock your shaft in place. A simple, reliable choice, set screws grip tightly, but they can mar shaft surfaces.

			Overall		Dynamic Load Cap., lb.
	For Shaft Dia.	Ctr. Ht.	Lg.	Wd.	Radial	Thrust	Max. Rotation Speed, rpm	Bearing Material	Bearing Seal Type		Each
Powder-Coated Cast Iron Housing







				Set Screw

				2 3/4"	3 1/8"	12"	4 1/2"	12,300	5,150	2,000	Steel	Sealed	1495N21	000000000

High-Temperature Graphite-Lubricated Thrust Bearings

Keep parts spinning in temperatures as hot as 750° F. Lubricated with graphite, these bearings stay slippery where oil would burn off or solidify. You can install and forget them since the lubricant lasts forever. All are fabricated, lubricated, and inspected in the U.S.

Extreme-Temperature Chemical-Resistant Graphalloy—From the freezer to the furnace, these bearings glide in extreme temperatures where other bearings grind and fail. They withstand strong acids and bases found in cleaning fluids. They even work underwater without swelling or warping.

	OD	Thk.	Dynamic Thrust Load Cap. @ Speed	Temp. Range, ° F		Each
Extreme-Temperature Chemical-Resistant Graphalloy



	2 3/4"	5 7/16"	31/64"	5,000 lb. @ 24 rpm	-450 to 750	4457N17	0000000

Flanged 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.

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.	Flange OD	Flange Thk.	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Temp. Range, ° F		Each
High-Load 932 Bearing Bronze



	2 3/4"	3 1/4"	1 1/2"	4"	3/16"	14,300 lb. @ 30 rpm	15,800 lb. @ 30 rpm	-350 to 450	7815K841	000000

Needle-Roller Thrust Bearings


Bearings	Washers

Small but mighty, our thinnest rolling thrust bearings slot into tight spaces and spin at whirring speeds. Their long, slender rollers support thrust loads and reduce friction in everything from machine tool spindles to gearboxes.

A cage holds the rollers in place. You can install these bearings without washers between hardened, ground surfaces for the thinnest profile. If you’re working with unhardened, unground surfaces, you’ll need two washers for the rollers to run on. This three-piece design is easy to lubricate, but the oil will attract dust and grime since it’s exposed.

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

	Thrust Bearings									Thin Washers			Thick Washers
	For Shaft Dia.	OD	Thk.	Cage Material	Dynamic Thrust Load Cap., lb.	Max. Rotation Speed, rpm	Temp. Range, ° F		Each	Thk.		Each	Thk.		Each
Steel



		2 3/4"	3 5/8"	1/8"	Steel	10,700	4,600	0 to 240	5909K954	000000	1/32"	5909K974	00000	1/16"	5909K983	000000

Washers for Needle-Roller Thrust Bearings

These hardened steel washers protect softer shafts and housings from the rolling contact of needle rollers. Without them, needle rollers can indent and score unhardened surfaces, leading to premature wear and bearing failure. Positioned between the bearing and each mating surface, these washers distribute thrust loads evenly and extend service life. They adapt needle-roller thrust bearings for unhardened, unground surfaces.

For Shaft Dia.	OD	Thk.	Washer Material		Each
2 3/4"	3 5/8"	1/32"	Steel	5909K974	00000
2 3/4"	3 5/8"	1/16"	Steel	5909K983	00000

Oil-Embedded Thrust Bearings

Our simplest-to-use thrust bearings, with no moving parts and no need to lubricate. Their porous surface releases oil over time, so you can install and forget them. While they run in most conditions, oil may drip away if temperatures climb too high. For extremely hot environments, consider graphite-lubricated bearings. All are fabricated, lubricated, and inspected in the U.S.

841 Bearing Bronze—A balance of strength and speed makes these bearings a good choice for most applications. Also known as SAE 841 bearing bronze.

	OD	Thk.	Dynamic Thrust Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	2 3/4"	3 7/8"	1/4"	9,600 lb. @ 30 rpm	Synthetic Oil	-35 to 300	5906K591	000000

Ultra-Low-Friction Oil-Embedded Thrust Bearings

Our slipperiest metal thrust bearings glide on machines with frequent starts and stops, such as conveyors. Their oil contains nonstick PTFE particles that reduce wear and heat, extending the life of your equipment. All are fabricated, lubricated, and inspected in the U.S.

841 Bearing Bronze—A balance of strength and speed makes these bearings a good choice for most applications. Also known as SAE 841 bearing bronze.

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 run at slower speeds. The increased iron content also makes them appear silver.

	OD	Thk.	Dynamic Thrust Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	2 3/4"	3 7/8"	1/4"	9,800 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	7421K136	000000


	High-Load 863 Iron Copper



			2 3/4"	3 7/8"	1/4"	6,600 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	—	7380N171	00000

Quick-Disconnect (QD) Bushings


Clamp-On Shaft Mount

The screw connections on these bushings easily mate to compatible quick-disconnect sprockets and pulleys. Bushings fit quick-disconnect (QD) sprockets and pulleys of the same bushing trade number. As you tighten the included screws, the bushing grips the shaft and pulls it into the sprocket or pulley.

		Keyway
	Overall Wd.	Wd.	Dp.	Fastener Tightening Torque, in·lbf	Material	Includes	For Shaft Dia.		Each
Clamp-On Shaft Mount







				Bushing Trade Number SF

				2 1/16"	5/8"	1/16"	360	Sintered Cast Iron	Clamping Screws, Machine Key	2 3/4"	6086K867	000000

Taper-Lock Bushings

Mount these hubless bushings flush into your sprocket or pulley for a slim profile with no protruding screws. They are for use with taper-lock sprockets of the same bushing trade number. As you tighten the included set screws, the bushing grips the shaft and pulls it into your sprocket or pulley.

			Keyway
	For Shaft Dia.	Overall Wd.	Wd.	Dp.	Taper	Fastener Tightening Torque, in·lbf	Includes		Each
Steel







				Bushing Trade Number 3020

				2 3/4"	2"	5/8"	5/16"	8°	800	Set Screws	57095K343	0000000