3" ID Bearings | McMaster-Carr

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

				3"	3 1/2"	1/4"	1F	640	1,000	65	800	30°	-60	250	Standard	6656K13	0000000


				3"	3 5/8"	5/16"	1F	930	1,400	95	1,000	30°	-60	250	Standard	6656K22	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						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

				3"	5 33/64"	1 11/16"	5 13/16"	0.109"	Sealed	1	17,400	2,250	-20	220	ER48	8090T48	0000000

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



		3"	5"	7/8"	42687/42620	8,650	49,800	6,200	60,800	1,500	Required	-60 to 200	5709K461	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.

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

				3"	3 1/4"	10 13/16"	3 13/64"	15,150	2,000	Steel	Sealed	2°	McMaster-Carr Approved	6494K88	0000000

Mounted Tapered-Roller Bearings with Four-Bolt Flange

Support heavier loads than mounted ball bearings, but at lower speeds. These bearings also withstand thrust loads, which are forces acting parallel to the shaft. The four-bolt flange supports shafts with a stronger connection to the mounting surface than two-bolt alternatives.

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.	Lg.	Wd.	Flange Thk.	Radial	Thrust	Max. Rotation Speed, rpm	Bearing Material	Bearing Seal Type		Each
Powder-Coated Cast Iron Housing







				Set Screw

				3"	7 3/4"	4 11/16"	1 5/8"	12,300	5,150	2,000	Steel	Sealed	1498N16	0000000

Oil-Embedded Flanged 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.

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.

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



	3"	3 1/2"	2 3/8"	4"	3/8"	14,250 lb. @ 30 rpm	8,750 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6338K615	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



	3"	3 1/2"	4"	38,150 lb. @ 30 rpm	-350 to 450	6381K401	000000


	3"	4"	6 1/2"	62,050 lb. @ 30 rpm	-350 to 450	6381K579	000000

Oil-Embedded Sleeve Bearings

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	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	3"	3 1/4"	1 1/4"	7,500 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K852	000000


	3"	3 1/4"	2"	12,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K853	00000
	3"	3 1/4"	3"	18,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K694	00000
	3"	4"	6 1/2"	39,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K429	000000

Flanged Sleeve 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



	3"	3 1/2"	2 3/8"	4"	3/8"	22,650 lb. @ 30 rpm	13,100 lb. @ 30 rpm	-350 to 450	7815K842	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



	3"	4 1/2"	1/8"	12,200 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	7421K137	000000


	High-Load 863 Iron Copper



			3"	4"	1/8"	6,000 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	—	7380N172	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

				3"	3 1/8"	12"	4 1/2"	12,300	5,150	2,000	Steel	Sealed	1495N22	000000000

Swivel Joints


Open Bearing	Sealed Bearing

Also known as spherical bearings, swivel joints support angular misalignment. Press them into a hole or housing where a ball joint rod end won’t fit. They need to be lubricated when first installed and periodically after that. Apply any type of bearing grease to the ball, and rotate it to work it into the races.

Sealed Bearing—Sealed joints keep grease in and contaminants out.

	OD	Overall Thk.	Housing Thk.	Max. Ball Swivel	Static Radial Load Cap., lb.	Material	Specs. Met		Each
Open Bearing



	3"	4 3/4"	2 5/8"	2 1/4"	12°	339,500	Bearing Steel	ANSI/ABMA 22.2	63195K35	0000000


	Sealed Bearing



			3"	4 3/4"	2 5/8"	2 1/4"	7°	339,500	Bearing Steel	ANSI/ABMA 22.2	63195K57	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 3/4"	3"	Not Rated	ASTM B438	8931K331	0000000	0000000


	1/2" Thick Wall



			4"	3"	Not Rated	ASTM B438	8931K441	000000	000000


			1" Thick Wall



					5"	3"	Not Rated	ASTM B438	8931K591	000000	000000


					1 1/2" Thick Wall



							6"	3"	Not Rated	ASTM B438	8931K621	000000	000000

Extended-Life Swivel Joints

Specially designed lubrication channels and integral seals allow these joints to last up to three times longer than other swivel joints. Also known as spherical bearings, they support angular misalignment. Press into a hole or housing where a ball joint rod end won’t fit. All have seals to keep grease in and contaminants out. Joints come greased and can be lubricated through a hole in the housing without removing the load.

						Temp.
ID	OD	Overall Thk.	Housing Thk.	Max. Ball Swivel	Static Radial Load Cap., lb.	Min.	Max., ° F	Material		Each



	3"	4 3/4"	2 5/8"	2 1/4"	7°	339,500	Not Rated	250	Bearing Steel	2699K21	0000000

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



	3"	4 1/2"	1/8"	12,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	5906K622	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

				3"	2"	3/4"	1/4"	8°	800	Machine Key, Set Screws	57095K352	0000000

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



	3 1/2"	3"	M07	ASTM B505	8911K337	000000	0000000	0000000


	1/2" Thick Wall



			4"	3"	M07	ASTM B505	8911K368	000000	000000	000000


			1" Thick Wall



					5"	3"	M07	ASTM B505	8911K401	000000	000000	000000


					1 1/2" Thick Wall



							6"	3"	M07	ASTM B505	8911K409	000000	000000	00000000

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

	3 1/4"	3"	6	Extruded	-40	180	9,195 to 11,030	0.04	Clear	UL 94 HB	8532K65	000000

Corrosion-Resistant 954 Bearing Bronze Round Tubes

One of the most corrosion-resistant bearing bronze alloys, 954 withstands everything from sea water to sulfuric acid. It's often turned into bearings and valve bodies for demanding environments such as salt mines. Also known as aluminum bronze. If you need similar corrosion resistance with even greater strength, consider 955 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		6 1/2" Long	13" Long
1/4" Thick Wall



	3 1/2"	3"	M07	ASTM B505	8916K8	0000000	0000000


	1/2" Thick Wall



			4"	3"	M07	ASTM B505	8916K89	000000	000000


			1" Thick Wall



					5"	3"	M07	ASTM B505	8916K107	000000	000000


					1 1/2" Thick Wall



							6"	3"	M07	ASTM B505	8916K108	000000	00000000

Self-Adjusting Spring Bushings

A toothed slot lets these bushings contract for insertion into the bore of your sprocket or pulley and then expand for a snug fit. Made of spring steel, they flex under stress and shock and can handle oscillating or slow rotational motion.

	Overall Wd.	Material		Each
For 3" Diameter Shafts



	3 1/2"	1 1/2"	Steel	58365K79	000000


	3 1/2"	2"	Steel	58365K81	00000
	3 1/2"	2 1/2"	Steel	58365K82	00000
	3 1/2"	3"	Steel	58365K83	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



	4"	3"	M07	ASTM B505	8918K139	0000000	0000000


	3/4" Thick Wall



			4 1/2"	3"	M07	ASTM B505	8918K155	000000	000000


			1" Thick Wall



					5"	3"	M07	ASTM B505	8918K159	000000	000000

Wide-Rim Shims

Spread loads across a wider surface area than standard shims to minimize costly wear between components. With thickness tolerances as fine as a strand of hair, these shims precisely align, space, and level components on shafts, arbors, and machinery.

You can stack multiple shims to achieve your exact thickness, but stacking more than four may cause them to shift. Remember, fewer shims are better, so a couple of thicker shims are more stable than a bunch of thin shims.

18-8 Stainless Steel—The choice for wet and outdoor environments, these shims resist rust. However, they’ll corrode or pit when exposed to salt water and chemicals.

Carbon Steel—Best for dry environments since moisture will cause these shims to rust.

Zinc-Plated Carbon Steel—A common choice for areas with occasional exposure to moisture.

	OD Tolerance	Min. Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	3" ID × 4 1/4" OD

	0.134"	-0.009" to 0.009"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	1	96853A412	000000


	Carbon Steel







					3" ID × 4" OD

					0.187"	-0.017" to 0.003"	0.01" to 0.025"	-0.01" to 0.01"	Not Rated	1	97063A585	0000




							3" ID × 4 1/4" OD

							0.075"	-0.007" to 0.007"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	5	97063A136	00000


							0.134"	-0.008" to 0.008"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	1	97063A560	0000


							Zinc-Plated Carbon Steel







											3" ID × 4" OD

											0.187"	-0.017" to 0.003"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	1	97669A536	0000




													3" ID × 4 1/4" OD

													0.075"	-0.007" to 0.007"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	1	97669A519	0000


													0.134"	-0.008" to 0.008"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	1	97669A532	0000

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

	4"	3"	1	Cast	Not Rated	230	10,000	1.4	Gray	4363N133	000000


	4"	3"	2	Cast	Not Rated	230	10,000	1.4	Gray	4363N134	000000




			3/4" Thick Wall

			4 1/2"	3"	1	Cast	Not Rated	230	10,000	1.4	Gray	4363N155	00000


			4 1/2"	3"	2	Cast	Not Rated	230	10,000	1.4	Gray	4363N156	000000




					1" Thick Wall

					5"	3"	1	Cast	Not Rated	230	10,000	1.4	Gray	4363N173	000000


					5"	3"	2	Cast	Not Rated	230	10,000	1.4	Gray	4363N174	000000




							1 1/2" Thick Wall

							6"	3"	1	Cast	Not Rated	230	10,000	1.4	Gray	4363N186	000000


							6"	3"	2	Cast	Not Rated	230	10,000	1.4	Gray	4363N187	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

				4"	3"	Cast	250	10,000 to 13,500	1 to 2.5	Blue	8413N181	000000	8413N182	0000000




						3/4" Thick Wall

						4 1/2"	3"	Cast	250	10,000 to 13,500	1 to 2.5	Blue	8413N261	000000	8413N262	000000




								1" Thick Wall

								5"	3"	Cast	250	10,000 to 13,500	1 to 2.5	Blue	8413N321	000000	8413N322	000000