3mm Spacers | McMaster-Carr

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51 Products

Dry-Running Flanged Sleeve Bearings

Made of naturally slippery plastic so you’ll never have to add lubricant. They’re ideal for clean environments where you need to prevent oil drips or graphite flakes. Compared to metal bearings, they are lighter and will never rust.

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.

Ultra-Chemical-Resistant PTFE—The most chemical-resistant bearings we offer. PTFE is unaffected by the harsh fluids that other plastics can't handle, including all strong acids and bases. PTFE also reduces friction better than nylon but is not as strong.

High-Load PEEK—Get the strength of reinforced PTFE without compromising on heat resistance. With no additives, such as polyester fabric, PEEK bearings won’t melt at high temperatures. They’re also nearly as slippery and chemical resistant as plain PTFE.

Ultra-Low-Friction Rulon J—These bearings glide effortlessly for applications with frequent starts and stops, such as conveyor systems.

Moisture-Resistant Ultra-Low-Friction Plastic Blend—These bearings won't warp or swell from humidity or direct contact with water. They glide effortlessly for applications with frequent starts and stops, such as conveyor systems.

High-Load Ultra-Low-Friction Plastic Blend—Create the least amount of friction of any bearings that we offer. They handle heavier loads than Rulon J bearings but can't withstand the same extreme temperatures.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Color	Temp. Range, ° F	Food Industry Std.		Each
Ultra-Chemical-Resistant PTFE



	3	6	4	9	1.5	5 lb. @ 120 rpm	7.5 lb. @ 120 rpm	White	-200 to 450	FDA Compliant 21 CFR 177.1550	2706T511	000000


	High-Load PEEK



			3	6	4	9	1.5	70 lb. @ 120 rpm	110 lb. @ 120 rpm	Beige	-20 to 450	—	6627K501	00000


			Ultra-Low-Friction Rulon J



					3	6	5	9	1.5	17 lb. @ 120 rpm	55 lb. @ 120 rpm	Gold	-400 to 500	—	6377K311	00000


					Moisture-Resistant Ultra-Low-Friction Plastic Blend



							3	4.5	3	7.5	0.75	36 lb. @ 120 rpm	60 lb. @ 120 rpm	Yellow	-50 to 190	—	2705T111	0000


							3	4.5	5	7.5	0.75	60 lb. @ 120 rpm	60 lb. @ 120 rpm	Yellow	-50 to 190	—	2705T112	0000


							High-Load Ultra-Low-Friction Plastic Blend



									3	4.5	5	7.5	0.75	85 lb. @ 120 rpm	85 lb. @ 120 rpm	Yellow	-55 to 190	—	2706T72	0000

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.

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, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	3	5	4	37 lb. @ 120 rpm	Mineral Oil	10 to 220	6658K412	00000


	3	6	4	37 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K64	0000
	3	6	6	55 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K111	0000
	3	6	10	90 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6658K721	0000


	High-Load 863 Iron Copper



			3	6	4	70 lb. @ 120 rpm	Synthetic Oil	-15 to 300	2868T304	0000


			3	6	10	185 lb. @ 120 rpm	Synthetic Oil	-15 to 300	2868T305	0000

Set Screw Shaft Collars

Slide these traditional collars from one end of the shaft and tighten the set screw. They dig into the shaft for a secure hold, but one that leaves a gouge. For maximum holding power, make sure the set screw is harder than the shaft.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.

Blue Passivated Zinc-Plated Carbon Steel—Withstand moisture and mild chemicals better than standard zinc-plated-steel collars. The blue passivated finish makes it easy to identify metric collars at a glance.

Carbon Steel—Strong and easy to machine. Use in dry environments, since moisture will cause steel to rust.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

				Set Screw
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Black-Oxide Carbon Steel



		3	10	5	Hex Socket	1	57485K63	00000


		Blue Passivated Zinc-Plated Carbon Steel



				3	7	5	Hex Socket	1	6057N11	0000


				Carbon Steel



						3	7	5	Hex Socket	1	6056N11	0000


						303 Stainless Steel



								3	7	5	Hex Socket	1	6058N11	0000


								3	10	5	Hex Socket	1	57485K12	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, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Temp. Range, ° F		Each
High-Load 932 Bearing Bronze



	3	6	3	55 lb. @ 120 rpm	-350 to 450	7811K111	00000

Dry-Running 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.

Ultra-Low-Friction Rulon J—These bearings glide effortlessly for applications with frequent starts and stops, such as conveyor systems.

								Each
	For Shaft Dia., mm	For Housing ID, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Color	Temp. Range, ° F		1-24	25-99	100-Up
Ultra-Low-Friction Rulon J



		3	6	5	17 lb. @ 120 rpm	Gold	-400 to 550	6377K511	000000	000000	000000

Oil-Embedded Flanged Sleeve 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.

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



	3	4.5	3	7.5	0.75	27 lb. @ 120 rpm	115 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K201	000000


	3	4.5	5	7.5	0.75	46 lb. @ 120 rpm	115 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K202	00000
	3	6	4	9	1.5	37 lb. @ 120 rpm	175 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K64	0000
	3	6	5	9	1.5	46 lb. @ 120 rpm	175 lb. @ 120 rpm	Synthetic Oil	-35 to 300	6659K203	00000
	3	6	6	9	1.5	55 lb. @ 120 rpm	175 lb. @ 120 rpm	Mineral Oil	10 to 220	6659K111	0000


	High-Load 863 Iron Copper



			3	6	4	9	1.5	70 lb. @ 120 rpm	270 lb. @ 120 rpm	Synthetic Oil	-15 to 300	2938T75	0000

Flanged Sleeve Bearings

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



	3	6	4	9	1.5	70 lb. @ 120 rpm	350 lb. @ 120 rpm	-350 to 450	5448T411	000000

Ultra-Low-Friction Oil-Embedded Sleeve Bearings

Our slipperiest metal bearings, these are ideal for machinery with frequent starts and stops, such as conveyors. With nonstick PTFE particles added to the oil, they reduce friction to minimize wear and heat, so equipment runs more efficiently and lasts longer. 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, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	3	6	4	37 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1688K114	00000


	3	6	10	90 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1688K115	0000


	High-Load 863 Iron Copper



			3	6	4	70 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7460N114	0000


			3	6	10	185 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7460N115	0000

Conical Disc Springs


	Stacking Configurations

The strongest disc springs we offer for maintaining tension and separating components on shafts, under bolt heads, and at the end of valves. Unlike spring lock washers, they return to their original height again and again when decompressed. Also known as Belleville disc springs.

To increase working load or deflection, stack multiple springs. A nested stack increases working load; an inverted stack increases deflection. In a nested and inverted stack, both load and deflection increase. Multiply the original working load or deflection (depending on your configuration) by the number of springs to find your new total.

Steel—Strong and resilient, but best suited for dry environments since moisture will cause these springs to rust.

Thk., mm	Ht., mm	Compressed Ht. @ Working Load, mm	Deflection @ Working Load, mm	Working Load, lb.	Flat Load, lbf	Material	Pkg. Qty.		Pkg.







Steel

3	3.2	6	0.3	0.45	0.337	0.113	26	34	Chrome-Vanadium Steel	12	96445K101	00000


3	3.2	8	0.3	0.55	0.363	0.187	23	28	Chrome-Vanadium Steel	12	96445K157	0000
3	3.2	8	0.5	0.7	0.55	0.15	80	104	Chrome-Vanadium Steel	12	96445K173	0000

Linear Ball Bearings

Bearings are for use with round end-supported shafts. To install, slide bearings into a housing (not included).

Fixed Alignment

Without Retaining

Ring Grooves

Fixed-alignment bearings are for use where shaft misalignment is unlikely.

Stainless Steel Ball—Bearings with stainless steel balls are more corrosion resistant than bearings with steel balls.

							Load Capacity, lb.		Temp., ° F
	For Shaft Dia., mm	Overall Lg., mm	OD, mm	For Housing ID	With Retaining Ring Grooves	With End Seals	Dynamic	Static	Min.	Max.	For Shaft Material		Each
440C Stainless Steel Bearings with Stainless Steel Balls



		3	10	7	7.000 mm to 7.015 mm	No	No	15	20	-4	176	Stainless Steel, Steel	61205K97	000000


		Steel Bearings with Steel Balls



				3	10	7	7.000 mm to 7.015 mm	No	No	15	20	-4	176	Stainless Steel, Steel	61205K71	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, mm	Thk., mm	Dynamic Thrust Load Cap. @ Speed	Base Oil	Temp. Range, ° F		Each
841 Bearing Bronze



	3	6	1.5	210 lb. @ 120 rpm	Synthetic Oil	-35 to 300	2011N36	00000

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.

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, mm	Thk., mm	Dynamic Thrust Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F		Each
High-Load 863 Iron Copper



	3	6	1.5	125 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	7380N173	000000

Shaft Collars

Slide these collars from one end of your shaft and tighten the clamping screw. They grip firmly and evenly without marring the shaft, so you can reposition or remove them later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

Zinc-Plated Carbon Steel—A step up from plain carbon steel collars, these withstand occasional exposure to moisture.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

Aluminum—One-third the weight of steel and corrosion resistant.

Black Anodized Aluminum—One-third the weight of steel and more corrosion resistant than unfinished aluminum.

				Clamping Screw
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Black-Oxide Carbon Steel



		3	18	9	Socket Head	1	57445K28	00000


		Zinc-Plated Carbon Steel



				3	16	9	Socket Head	1	57445K436	00000


				303 Stainless Steel



						3	18	9	Socket Head	1	9616T12	00000


						Aluminum



								3	18	9	Socket Head	1	9506T18	0000


								Black Anodized Aluminum



										3	16	9	Socket Head	1	9506T332	00000

Two-Piece Shaft Collars

For Round Shafts

Attach these collars anywhere along your shaft, which helps when other components are already installed or you can't access the end. They clamp firmly and evenly without marring the shaft, so you can reposition or remove collars later.

Black-Oxide Carbon Steel—Dark and matted for a finished look, but with minimal corrosion resistance. Best for dry environments.

303 Stainless Steel—Withstand moisture and mild cleaning solutions, such as acetone and ammonia. These are easier to machine than other stainless steel collars.

Aluminum—One-third the weight of steel and corrosion resistant.

				Clamping Screw		For Round Shafts
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Black-Oxide Carbon Steel



		3	16	9	Socket Head	2	6063K44	000000


		303 Stainless Steel



				3	16	9	Socket Head	2	3369K41	00000


				Aluminum



						3	16	9	Socket Head	2	9520T27	00000

High-Temperature Linear Ball Bearings

The choice for low-friction motion in high-temperature environments. Bearings are for use with round end-supported shafts and have a fixed-alignment design for applications where shaft misalignment is unlikely. To install, slide bearings into a housing (not included).

Fixed Alignment

Without Retaining

Ring Grooves

							Load Capacity, lb.			Temp., ° F
	For Shaft Dia., mm	Overall Lg., mm	OD, mm	For Housing ID	With Retaining Ring Grooves	With End Seals	Dynamic	Static	Dynamic Load Cap. @ Temp.	Min.	Max.	For Shaft Material		Each
Steel Bearings with Steel Balls



		3	10	7	7.000 mm to 7.015 mm	No	No	15	20	15 lb. @ 230° F	-4	230	Stainless Steel, Steel	63255K41	000000

Plastic Shaft Collars

Lightweight alternatives to metal collars for weight-sensitive applications. Slide these collars from one end of your shaft and tighten the clamping screw. They grip firmly and evenly without marring the shaft, so you can reposition or remove them later.

Acetal—Resist swelling when exposed to moisture.

				Clamping Screw
	For Shaft Dia., mm	OD, mm	Wd., mm	Type	No. Included		Each
Acetal



		3	16	9	Socket Head	1	3761N115	000000

Oil-Embedded Sleeve Bearings for Food and Beverage

These lead-free bearings are infused with a food-grade oil that is odorless, colorless, tasteless, and safe for unintended contact with food. They’re often used in food and beverage processing, packing, and handling equipment. All are made from porous metal and saturated with oil to reduce maintenance and downtime. If you need a bearing rated for contact with food, consider dry-running sleeve bearings for food and beverage. 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, mm	Lg., mm	Dynamic Radial Load Cap. @ Speed	Base Oil	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	3	6	10	90 lb. @ 120 rpm	Synthetic Oil	-75 to 300	FDA Compliant 21 CFR 178.3570	7095K115	00000


	High-Load 863 Iron Copper



			3	6	4	70 lb. @ 120 rpm	Synthetic Oil	-75 to 300	FDA Compliant 21 CFR 178.3570, ASTM B439	7407N114	0000

Ultra-Low-Friction Oil-Embedded Flanged Sleeve Bearings

841 Bearing Bronze—A classic choice for a starter pick. Also known as SAE 841 bearings.

	For Housing ID, mm	Lg., mm	Flange OD, mm	Flange Thk., mm	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Base Oil	Lubricant Additive	Temp. Range, ° F	Specs. Met		Each
841 Bearing Bronze



	3	6	4	9	1.5	37 lb. @ 120 rpm	175 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	ASTM B438	1677K214	00000


	High-Load 863 Iron Copper



			3	6	4	9	1.5	70 lb. @ 120 rpm	270 lb. @ 120 rpm	Synthetic Oil	PTFE	-60 to 300	—	7119N113	0000