3" Spacers | McMaster-Carr

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	6391K842	000000


	2 1/2"	3"	2 1/2"	12,500 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K691	00000
	2 1/2"	3"	3"	15,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K841	00000
	2 1/2"	3"	4"	20,000 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K428	000000
	2 3/4"	3"	1 1/2"	8,250 lb. @ 30 rpm	Synthetic Oil	-35 to 300	6391K846	00000
	2 3/4"	3"	2 1/2"	13,750 lb. @ 30 rpm	Mineral Oil	10 to 220	6391K89	00000


	High-Load 863 Iron Copper



			2 1/2"	3"	4"	17,800 lb. @ 30 rpm	Synthetic Oil	-15 to 300	2868T274	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	6381K578	000000


	2 1/2"	3"	5"	47,700 lb. @ 30 rpm	-350 to 450	6381K391	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	9368T255	0000000