2 1/4" 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



		2 1/4"	3 13/16"	5/8"	387A/382A	4,900	24,100	2,950	24,900	2,000	Required	-60 to 200	5709K94	000000

High-Load Tapered-Roller Bearings


Assembled View	Exploded View

Double rows of tapered bearings support large shafts with heavy loads. They also handle thrust loads in either direction as well as radial loads. All come assembled and ready to use.

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



		2 1/4"	4 1/4"	2 1/8"	462/452D	Out	62,900	37,200	20,700	36,400	0.012"	Two Direction	6,700	Required	-65 to 250	One Spacer	4456N12	0000000

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.

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.

				Retaining Ring						Temp. Range, ° F
	For Shaft Dia.	For Housing ID	Wd.	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

				2 1/4"	4 21/64"	1 1/4"	4 37/64"	0.094"	Sealed	1	11,750	3,000	-20	220	ER36	8090T41	0000000

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.

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.

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.

Sealmaster—Famous for exceptional sealing, Sealmaster bearings include a signature three-part seal in the inner ring. This design blocks out gritty debris and purges old grease to extend the life of the bearing.

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
Powder-Coated Cast Iron Housing







				Set Screw

				2 1/4"	2 3/4"	9 1/2"	2 15/16"	11,700	3,000	Steel	Sealed	2°	Sealmaster	7728T76	0000000


				Nickel-Plated Cast Iron Housing







								Set Screw

								2 1/4"	2 3/4"	9 1/2"	2 15/16"	11,750	2,000	Steel	Sealed	2°	McMaster-Carr Approved	6494K84	000000

Mounted Ball Bearings with Two-Bolt Flange

Smoother than smooth—the balls inside these bearings roll nearly friction-free. The sturdy housing supports the shaft and secures with a two-bolt flange, the most common type of flanged bearing.

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.

SKF—Manufactured in Europe with a strong focus on precision. The more precise the bearing, the more efficiently it will run.

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.	Lg.	Wd.	Flange Thk.	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Bearing Material	Bearing Seal Type	Misalignment Capability	Manufacturer		Each
Powder-Coated Cast Iron Housing







				Set Screw

				2 1/4"	9 1/4"	2 29/32"	13/16"	11,800	3,400	Steel	Sealed	2°	SKF	5968K115	0000000

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 1/4"	3 23/32"	13/16"	Steel	11,200	1,900	-40 to 245	60715K51	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	Lg.	Dynamic Radial Load Cap. @ Speed	Temp. Range, ° F		Each
High-Load 932 Bearing Bronze



	2 1/4"	2 3/4"	2"	18,000 lb. @ 30 rpm	-350 to 450	6381K58	000000


	2 1/4"	2 3/4"	3"	27,000 lb. @ 30 rpm	-350 to 450	6381K381	00000
	2 1/4"	2 3/4"	4"	36,000 lb. @ 30 rpm	-350 to 450	6381K29	00000

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.

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 1/4"	2 3/4"	10 1/2"	4"	11,600	3,450	2,400	Steel	Sealed	1495N18	0000000

Dry-Running Metal-Reinforced Plastic Thrust Bearings

Combine naturally slippery PTFE with the strength of metal. These bearings don't need lubricant, so there's no oil to maintain, drip off, or attract dust. Backed with steel, they're as strong as other all-metal thrust bearings. However, they're best for dry environments since moisture will cause the steel to rust.

	OD	Thk.	Dynamic Thrust Load Cap. @ Speed	Temp. Range, ° F		Each
Steel-Backed PTFE



	2 1/4"	3 1/4"	3/32"	17,250 lb. @ 30 rpm	-320 to 530	1262N39	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.

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 if the bearing heats up.

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



	2 1/4"	4 1/2"	1/8"	16,500 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	7421K134	000000


	High-Load 863 Iron Copper



			2 1/4"	4"	1/8"	10,400 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	—	7380N168	00000

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 1/4"	3"	1/32"	Steel	5909K973	00000
2 1/4"	3 1/8"	3/32"	Steel	5909K982	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 1/4"	4 1/2"	1/8"	16,500 lb. @ 30 rpm	Synthetic Oil	-35 to 300	5906K621	000000

Multipurpose 932 Bearing Bronze Round Tubes

Balancing strength, corrosion resistance, and machinability, 932 is everything you want in a bearing bronze. It's most commonly made into thrust bearings and bushings. Also known as SAE 660.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	ID	Temper Designation	Specs. Met		3" Long	6 1/2" Long	13" Long
1/4" Thick Wall



	2 3/4"	2 1/4"	M07	ASTM B505	8911K334	000000	000000	0000000


	3/8" Thick Wall



			3"	2 1/4"	M07	ASTM B505	8911K353	00000	000000	000000


			1/2" Thick Wall



					3 1/4"	2 1/4"	M07	ASTM B505	8911K365	000000	000000	000000

Clear Scratch- and UV-Resistant Acrylic Round Tubes

When compared to cast acrylic tubes, these extruded acrylic tubes offer nearly the same performance at a fraction of the cost. Use them for sight gauges and protective covers. This scratch- and UV-resistant material stands up to outdoor use better than polycarbonate and maintains clarity over time.

	Fabrication	Min. Temp., ° F	Max. Temp., ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Color	Flammability Rating		Each
Standard Tolerance







	1/8" Thick Wall

	2 1/2"	2 1/4"	6	Extruded	-40	180	9,195 to 11,030	0.04	Clear	UL 94 HB	8532K47	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 2517

				2 1/4"	1 3/4"	1/2"	1/4"	8°	430	Set Screws	57095K218	000000

Oil-Embedded 841 Bearing Bronze Round Tubes

With a porous surface that releases oil over time, this bronze lubricates itself. Turn it into parts that you can't easily access to relubricate, such as bearings, well pumps, and turbine blades. The oil may burn away if temperatures climb too high, however. For extreme heat up to 700° F, consider graphite-embedded bearing bronze instead.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	ID	Temper Designation	Specs. Met		3" Long	6 1/2" Long
3/8" Thick Wall



	3"	2 1/4"	Not Rated	ASTM B438	8931K321	0000000	0000000


	1/2" Thick Wall



			3 1/4"	2 1/4"	Not Rated	ASTM B438	8931K421	000000	000000

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"	1/2"	1/4"	360	Sintered Steel	Clamping Screws	2 1/4"	6086K637	000000




						Bushing Trade Number SK

						1 15/16"	1/2"	1/8"	180	Sintered Cast Iron	Clamping Screws, Machine Key	2 1/4"	6086K859	00000

Highly Machinable 936 Bearing Bronze Round Tubes

With almost twice as much lead, 936 bearing bronze machines more easily than 932. It's often made into bearings and bushings for oil pumps and gasoline engines. Also known as modified SAE 64.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

	ID	Temper Designation	Specs. Met		6" Long	13" Long
1/2" Thick Wall



	3 1/4"	2 1/4"	M07	ASTM B505	8918K137	0000000	0000000

Telescoping Delrin® Acetal Round Tubes

Telescoping tubes, also known as bushing stock, slide over rods and inside shafts to increase or decrease the diameter. Their precise sizing also allows ascending sizes to fit inside each other to increase the wall thickness.

Easy to machine to close tolerances, these dimensionally stable tubes resist expanding when exposed to heat and moisture. They have a naturally slippery surface along with excellent wear resistance. Use them to make precision gears, bushings, and bearings. Delrin® acetal resin, also known as acetal homopolymer, is stronger and stiffer than acetal copolymer.

									White
	OD	ID	Fabrication	Temp., ° F	Lg.	Tensile Strength, psi	Impact Strength, ft·lbf/in	Food Industry Std.		Each
Tight Tolerance







				1/8" Thick Wall (-0.005" to 0.005" Tolerance)

				2 1/2"	2 1/4"	Extruded	0 to 180	6"	7,690	1 to 1.5	FDA Standard, NSF Standard	1989T19	0000000

Telescoping UHMW Polyethylene Round Tubes

Telescoping tubes, also known as bushing stock, slide over rods and inside shafts to increase or decrease the diameter. Their precise sizing allows ascending sizes to fit inside each other to create a thicker wall. These impact- and wear-resistant tubes offer 360° protection from scrapes and strikes to wires, cords, and anything that can slide through them. UHMW has a low-friction surface that resists sticking and binding.

	Fabrication	Min. Temp., ° F	Max. Temp., ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Color		Each
Undersized Tolerance/Tight Tolerance







	1/4" Thick Wall (-0.06" to 0" Tolerance)

	2 3/4"	2 1/4"	6"	Extruded	-20	180	4,350 to 5,800	16.8	White	1988T15	000000

High-Temperature Cast Nylon Round Tubes

A good choice for making sprockets and pulleys, these cast nylon 6 tubes withstand higher temperatures and are easier to machine than standard nylon 6/6 tubes. This material is comparable to Nylatron and Nycast.

Oversized Tolerance—Oversized tubes have an oversized OD and an undersized ID for finishing to the sizes listed.

								1 ft. Long		2 ft. Long
	OD	ID	Fabrication	Max. Temp., ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Color		Each		Each
Oversized Tolerance







				1/2" Thick Wall

				3 1/4"	2 1/4"	Cast	250	10,000 to 13,500	1 to 2.5	Blue	8413N161	000000	8413N162	0000000

Highly Wear-Resistant Machinable Cast Nylon Round Tubes

The addition of MDS gives these tubes exceptional wear resistance along with a self-lubricating surface. They're made of cast nylon 6, making them easier to machine and better electrical insulators than other MDS-filled nylon tubes. Tubes can be used to fabricate pulleys, bushings, and bearings installed in hard-to-reach areas where adding a lubricant would be difficult. This material is comparable to Nylatron and Nycast.

Oversized Tolerance—Oversized tubes have an oversized OD and an undersized ID for finishing to the sizes listed.

	Fabrication	Min. Temp.	Max. Temp., ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Color		Each
Oversized Tolerance







	1/2" Thick Wall

	3 1/4"	2 1/4"	1	Cast	Not Rated	230	10,000	1.4	Gray	4363N128	000000


	3 1/4"	2 1/4"	2	Cast	Not Rated	230	10,000	1.4	Gray	4363N129	000000