3 1/4" OD 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"	3 1/4"	0.65"	LM104949/LM104911	4,350	23,400	2,250	20,800	2,300	Required	-60 to 200	5709K91	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.

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

	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 1/2"	3 1/4"	1 1/2"	15,800	36,400	5,300	Required	16	0 to 245	Lubrication Groove, Lubrication Hole	7929K203	000000	—	———	0


		For Radial Load—Sealed with Steel Ring



				2 1/2"	3 1/4"	1 3/4"	15,800	36,400	1,500	Required	16	-30 to 250	Lubrication Groove, Lubrication Hole	8258K103	000000	2"	7929K504	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
	For Shaft Dia.	OD	Thk.	Cage Material	Dynamic Thrust Load Cap., lb.	Max. Rotation Speed, rpm	Temp. Range, ° F		Each	Thk.		Each
Steel



		2 1/2"	3 1/4"	5/64"	Steel	6,200	3,300	0 to 240	5909K27	000000	0.032"	5909K271	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 1/2"	3 1/4"	0.032"	Steel	5909K271	00000

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

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.

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	Temp. Range, ° F		Each
841 Bearing Bronze



	2 1/2"	3 1/4"	1/8"	6,600 lb. @ 30 rpm	Synthetic Oil	-35 to 300	5906K589	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
3/8" Thick Wall



	3 1/4"	2 1/2"	M07	ASTM B505	8911K354	000000	0000000	0000000


	1/2" Thick Wall



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


			5/8" Thick Wall



					3 1/4"	2"	M07	ASTM B505	8911K419	000000	000000	000000


					7/8" Thick Wall



							3 1/4"	1 1/2"	M07	ASTM B505	8911K393	000000	000000	000000

Thrust Bearings

With no moving parts, these bearings are the plainest way to support thrust loads while reducing friction. They don't come with lubricant, so you can choose the oil that's best for your application. Make sure to mount them where they're easy to access, since you'll need to replenish the oil frequently. All are fabricated and inspected in the U.S.

High-Load 932 Bearing Bronze—Cast from an alloy of leaded tin bronze for uniform rigidity and strength. Also known as 660 leaded bronze.

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



	2 1/2"	3 1/4"	1/8"	Not Rated	-350 to 450	7814K446	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 1/2"	3 1/4"	1/8"	6,600 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	7421K135	000000


	High-Load 863 Iron Copper



			2 1/2"	3 1/4"	1/8"	4,500 lb. @ 30 rpm	Synthetic Oil	PTFE	-60 to 300	—	7380N169	00000

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	Color	Flammability Rating		Each
Standard Tolerance







	1/8" Thick Wall

	3 1/4"	3"	6	Extruded	-40	180	Clear	UL 94 HB	8532K65	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
1/2" Thick Wall



	3 1/4"	2 1/4"	Not Rated	ASTM B438	8931K421	0000000	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	Color		Each
Undersized Tolerance/Tight Tolerance







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

	3 1/4"	2 3/4"	6"	Extruded	-20	180	White	1988T16	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.

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

	OD Tolerance	Min. Hardness	Pkg. Qty.		Pkg.
Carbon Steel







	1 3/4" ID × 3 1/4" OD

	0.134"	-0.008" to 0.008"	0.01" to 0.025"	-0.01" to 0.01"	Rockwell B38	1	97063A535	00000

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	Color		Each		Each
Oversized Tolerance







				1/2" Thick Wall

				3 1/4"	2 1/4"	Cast	250	Blue	8413N161	000000	8413N162	0000000

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


	5/8" Thick Wall



			3 1/4"	2"	M07	ASTM B505	8918K147	000000	000000

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	Color		Each
Oversized Tolerance







	1/2" Thick Wall

	3 1/4"	2 1/4"	1	Cast	Not Rated	230	Gray	4363N128	000000


	3 1/4"	2 1/4"	2	Cast	Not Rated	230	Gray	4363N129	000000




			1" Thick Wall

			3 1/4"	1 1/4"	1	Cast	Not Rated	230	Gray	4363N164	00000


			3 1/4"	1 1/4"	2	Cast	Not Rated	230	Gray	4363N165	000000