0.253" ID Bearings | McMaster-Carr

For silky-smooth motion, the balls inside these bearings roll nearly friction-free. You'll often find them at the end of a shaft or between a stationary and rotating surface, such as on a propeller or rotary table.

These bearings come as three separate pieces—one cage and two washers. The cage holds the balls in place, while the washers create a surface for the balls to roll on. This 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.

Stainless Steel—These bearings won't degrade from water or mild chemicals, such as the ammonia in cleaning solutions. However, they're not as strong as steel bearings.

	OD	Thk.	Cage Material	Dynamic Thrust Load Cap., lb.	Max. Rotation Speed, rpm	Temp. Range, ° F	Includes		Each
Steel



	1/4"	9/16"	0.193"	Nylon	130	5,000	-40 to 220	Two Washers	6655K13	00000


	Stainless Steel



			1/4"	9/16"	0.193"	Nylon	90	5,000	-40 to 220	Two Washers	6655K33	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.

Mineral Oil Base—Mineral oil consistently lubricates at most temperatures but doesn’t last as long as synthetic oil.

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



	1/4"	5/16"	5/8"	310 lb. @ 120 rpm	Mineral Oil	10 to 220	6391K331	00000

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.

MDS-Filled Nylon—A step up from standard nylon bearings. Upgraded with fine particles of molybdenum disulfide (MDS), these bearings have extra lubricity and wear resistance. However, they’re still nylon, which will swell and weaken when exposed to moisture.

	For Housing ID	Lg.	Flange OD	Flange Thk.	Dynamic Radial Load Cap. @ Speed	Dynamic Thrust Load Cap. @ Speed	Color	Temp. Range, ° F		Each
MDS-Filled Nylon



	1/4"	3/8"	5/16"	1/2"	1/16"	27 lb. @ 120 rpm	28 lb. @ 120 rpm	Black	-40 to 170	6294K203	00000


	1/4"	3/8"	3/8"	1/2"	1/16"	32 lb. @ 120 rpm	28 lb. @ 120 rpm	Black	-40 to 170	6294K204	0000
	1/4"	3/8"	1/2"	1/2"	1/16"	43 lb. @ 120 rpm	28 lb. @ 120 rpm	Black	-40 to 170	6294K205	0000
	1/4"	3/8"	1/2"	1/2"	3/32"	43 lb. @ 120 rpm	28 lb. @ 120 rpm	Black	-40 to 170	6294K206	0000

Dry-Running Thrust Bearings

Made of naturally slippery plastic so there's no lubricant to maintain or make a mess. These bearings are ideal for spic-and-span spaces since oil won't drip off, wash out, or collect dust over time. They'll also never rust.

High-Load PEEK—Our strongest all-plastic bearings. PEEK also resists a range of harsh chemicals, including most acids and bases.

	OD	Thk.	Dynamic Thrust Load Cap. @ Speed	Color	Temp. Range, ° F		Each
High-Load PEEK



	1/4"	5/8"	1/16"	320 lb. @ 120 rpm	Black	-40 to 500	1252N1	00000

Shims for Ball Bearing Outer Rings

Image of Product. Front orientation. CrossSection, ZoomedIn view. Contains Annotated. Shims. Round, For Ball Bearing Outer Rings, Sold Individually.

Boost bearing efficiency and lifespan. Often used on motor shafts, these shims evenly distribute the load between multiple bearings by creating space between their outer rings. This prevents excessive pressure on any single bearing, maintaining proper alignment for smooth operation and reduced wear.

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.

Highly Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these shims won't degrade when exposed to harsh weather, salt water, and most chemicals.

Brass—With a warm, polished look, these shims are often chosen for their appearance. Similar to 18-8 stainless steel, brass is corrosion resistant enough to stand up to wet environments.

	For Bearing
	Trade No.	ID	OD	ID	ID Tolerance	OD	OD Tolerance	Min. Hardness	Choose a Thickness	Pkg. Qty.		Pkg.
18-8 Stainless Steel



		R2, R166	1/8", 3/16"	3/8"	0.253"	0" to 0.005"	0.373"	-0.005" to 0"	Rockwell B70	0.003", 0.005", 0.007", 0.01", 0.02"	25	93574A500	000000


		Highly Corrosion-Resistant 316 Stainless Steel



				R2, R166	1/8", 3/16"	3/8"	0.253"	0" to 0.005"	0.373"	-0.005" to 0"	Rockwell B90	0.005", 0.007", 0.01", 0.02"	10	91182A150	00000


				Brass



						R2, R166	1/8", 3/16"	3/8"	0.253"	0" to 0.005"	0.373"	-0.005" to 0"	Rockwell B70	0.003", 0.005", 0.007", 0.01", 0.02"	10	92409A500	0000

Press-Fit Drill Bushings

Also known as jig bushings, these drill bushings fit inside fixture plate holes to precisely guide drill bits, counterbores, reamers, and other cutting tools. They improve accuracy so your drilled holes and cuts are consistent from part to part. Known for their versatility, drill bushings are also used as spacers, shims, and machinery bushings.

Press into place with a manual or hydraulic press. Since these bushings are sized slightly larger than the hole for an extremely tight fit, they’ll stay put permanently. These are ANSI Type P bushings—also known as headless bushings—which means you don’t need to counterbore the hole to mount them flush.

Don't see the size you need? Additional sizes are available.

					Tolerance							Each
	OD	Lg.	For Drill Bit Size	For Drill Bit Size Decimal Equiv.	ID	OD	Lg.	Drill Bushing Type	Material	Hardness		1-9	10-49	50-Up
0.253" ID



		3/8"	1/2"	1/4", E	0.25"	0.0001" to 0.0005"	0.0013" to 0.0016"	-0.01" to 0.01"	P	Steel	Rockwell C61	8491A843	00000	00000	00000

Press-Fit Reamer Bushings

With ID tolerances sized specifically for reamers, these bushings ensure steady and precise hole finishing. Press them into a fixture plate with a manual or hydraulic press for permanent installation. Also known as headless bushings, these ANSI-type P bushings don’t need counterboring to be mounted flush. They are made of hardened, ground steel that holds its shape and resists wear, so they last for many cycles without needing to be replaced.

				Tolerance
ID	OD	Lg.	For Reamer Dia.	ID	OD	Lg.	Drill Bushing Type	Material	Hardness		Each
0.253"	1/2"	1/2"	0.253"	0.0006" to 0.001"	0.0014" to 0.0017"	-0.01" to 0.01"	P	Steel	Rockwell C61	9473N299	00000