68mm OD Bearings | McMaster-Carr

Smoother than smooth—the balls inside these bearings roll nearly friction-free. You’ll often find them on rapidly rotating parts, from the whirring chuck on a power drill to the spinning shaft on an electric motor.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

Shielded—The balls are covered just enough to keep out large particles while allowing air to pass through and dissipate heat.

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.

Steel—Strong and wear resistant. However, these bearings are best for dry environments since moisture will cause them to rust.

Corrosion-Resistant 440C Stainless Steel—Combine the strength of steel with the corrosion resistance of stainless steel. These bearings won't degrade from water or mild chemicals, such as the ammonia in cleaning solutions. However, they'll weaken when exposed to salt water and harsh chemicals, such as bleach.

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.

							Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Min.	Max.	Inner Ring Type	Bearing Trade No.		Each
Open







				Corrosion-Resistant 440C Stainless Steel

				40	68	15	1	3,200	12,000	-40	240	Standard	6008	00000000	0000000


				Shielded







								Steel

								40	68	15	1	4,000	12,000	-20	230	Standard	6008-2Z	00000000	00000


								40	68	15	3	4,000	11,000	-20	230	Standard	6008-2Z	0000000	00000
								45	68	12	1	3,150	9,700	-40	150	Standard	6909-2Z	00000000	00000




										Corrosion-Resistant 440C Stainless Steel

										40	68	15	1	3,200	10,000	-40	240	Standard	6008-2Z	00000000	000000


										Sealed







														Steel

														40	68	15	1	4,000	5,400	-20	230	Standard	6008-2RS	00000000	00000


														40	68	15	3	4,000	7,000	-30	210	Standard	6008-2RS	0000000	00000

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., mm	For Housing ID, mm	Wd., mm	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



		40	68	14.5	32008	3,000	16,100	1,900	17,700	2,700	Required	-60 to 200	0000000	000000


		40	68	14.5	32008	10,550	15,100	6,650	Not Rated	5,300	Required	-50 to 300	0000000	00000

Permanently Lubricated Ball Bearings

Install and forget these self-lubricating bearings. Their lubricant is a solid material that fills the space between the balls and releases oil over time, so you'll never need to add more.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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.

Steel—Strong and wear resistant. However, these bearings are best for dry environments since moisture will cause them to rust.

							Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Min.	Max.	Inner Ring Type	Bearing Trade No.		Each
Open







				Corrosion-Resistant 440C Stainless Steel

				40	68	15	1	2,900	5,000	-10	200	Standard	6008	00000000	0000000


				45	68	12	1	3,150	5,000	-10	200	Standard	6909	00000000	000000


				Sealed







								Steel

								40	68	15	1	3,200	5,550	10	200	Standard	6008-2RS	00000000	00000




										Corrosion-Resistant 440C Stainless Steel

										40	68	15	1	2,900	5,000	-10	200	Standard	6008-2RS	00000000	000000


										45	68	12	1	3,150	5,000	-10	200	Standard	6909-2RS	00000000	000000

Needle-Roller Bearings

Also known as drawn-cup roller bearings, these are our thinnest roller bearings. The outer ring is drawn out to form a lip that holds the bearing together. Bearings take on the shape of their housing and may be oblong prior to installation.

Open Bearing—Open bearings dissipate heat more efficiently than sealed bearings.

				Radial Load Cap., lb.
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Dynamic	Static	Max. Rotation Speed, rpm	Lubrication	For Shaft Surface Smoothness, Ra, μin	Temp. Range, ° F	Specs. Met		Each
For Radial Load—Open with Steel Ring



		60	68	12	3,900	7,150	4,450	Required	8	-20 to 280	DIN 618, ISO 3245	00000000	000000


		60	68	20	7,500	16,850	4,450	Required	8	-20 to 280	DIN 618, ISO 3245	00000000	00000
		60	68	32	11,900	30,300	4,450	Required	8	-20 to 280	DIN 618, ISO 3245	00000000	00000

High-Precision Angular Contact Ball Bearings

Open

Sealed

Our most precise bearings for tackling radial and thrust loads at once, with tolerances tighter than a speck of dust. Rated ABEC 7 out of 9, they meet strict tolerance standards established by the Annular Bearing Engineers Committee (ABEC). Choose them for equipment that requires both high speed and pinpoint accuracy, such as machine tool spindles. For example, a bearing on a spindle withstands a radial load as it spins at high speeds and a thrust load when the cutting tool touches the workpiece. These bearings don’t handle as much force from radial loads as standard ones, but you can pair them with a cylindrical roller bearing to increase their load capacity.

Single Row—Single-row bearings withstand thrust loads from one direction.

Open—With no rubber seal to block airflow, these bearings dissipate heat quickly, extending the life of the lubricant and reducing friction over time.

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.

Steel—Strong and wear resistant. However, these bearings are best for dry environments since moisture will cause them to rust.

										Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Material	Dynamic Combined Load Cap., lbf	Max. Rotation Speed, rpm	Lubrication	Contact Angle	Min.	Max.	Bearing Trade No.		Each
Single Row







				Open

				40	68	15	7	Steel	3,750	20,000	Required	15°	-30	140	7008	0000000	0000000




						Sealed

						40	68	15	7	Steel	4,850	21,300	Lubricated	15°	0	230	7008	0000000	000000

Ball Bearings for Food and Beverage

Sealed

Food production rolls along smoothly on these bearings. Greased with FDA-compliant lubricant, they’re safe to install on food-processing equipment, such as conveyor belts, so long as they don’t directly touch the food. The lubricant is a solid material that fills the space between the balls and releases oil over time, so you'll never need to add more.

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.

							Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Min.	Max.	Inner Ring Type	Food Industry Std.	Bearing Trade No.		Each
Sealed







				Corrosion-Resistant 440C Stainless Steel

				40	68	15	1	3,200	5,000	-40	200	Standard	FDA Compliant 21 CFR 178.3570	6008-2RS	00000000	0000000


				45	68	12	1	2,650	5,000	-40	200	Standard	FDA Compliant 21 CFR 178.3570	6909-2RS	00000000	000000

Electrically Insulating Ball Bearings

Sealed

Protect bearings from stray currents. The ceramic balls insulate bearings from electrical charges in electric motors and power generators that can damage the inner ring over time. The balls also generate less heat than metal ones, so you don’t have to lubricate them as often to keep bearings running smoothly.

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.

Steel—Strong and wear resistant. However, these bearings are best for dry environments since moisture will cause them to rust.

							Temp. Range, ° F			Ceramic Balls
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Dynamic Radial Load Cap., lb.	Max. Rotation Speed, rpm	Min.	Max.	Bearing Trade No.		Each
Sealed







				Steel

				40	68	15	1	4,000	12,000	-40	210	6008-2RZ	0000000	0000000

Angular Contact Ball Bearings

Single Row

Open

Support radial and thrust loads at the same time. These bearings are often found inside equipment such as gearboxes and pumps. For example, a bearing inside a gearbox withstands a radial load when the gear is engaged and a momentary thrust load when you shift to a new one. While they don't handle as much force from radial loads as standard bearings, you can pair them with a cylindrical roller bearing to increase their load capacity.

Single Row—Single-row bearings withstand thrust loads from one direction.

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.

										Temp. Range, ° F
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	ABEC Rating	Material	Dynamic Combined Load Cap., lbf	Max. Rotation Speed, rpm	Lubrication	Contact Angle	Min.	Max.	Bearing Trade No.		Each
Single Row







				Open

				40	68	15	5	Steel	4,800	21,700	Required	15°	-40	250	7008	00000000	0000000

Thrust Ball Bearings

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.

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



	40	68	19	Steel	10,500	3,900	-40 to 250	Two Washers	00000000	000000


	45	68	16	Steel	6,500	3,600	-40 to 240	Two Washers	0000000	00000

Shims

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.

Stress-Resistant Spring Steel—These shims are harder and hold their shape better than carbon steel. Use them for high-stress applications, such as leveling heavy machinery. They're best for dry environments since moisture will cause them to rust.

	OD Tolerance, mm	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel







	55 mm ID × 68 mm OD

	0.1	-0.013 to 0.013	-0.31 to 0.29	0.02 to 0.12	Rockwell B70	—	5	000000000	000000


	0.2	-0.023 to 0.023	-0.31 to 0.29	0.02 to 0.12	Rockwell B70	—	5	000000000	00000
	0.3	-0.055 to 0.055	-0.31 to 0.29	0.02 to 0.12	Rockwell B70	—	5	000000000	00000
	0.5	-0.064 to 0.064	-0.31 to 0.29	-0.01 to 0.09	Rockwell B70	—	5	000000000	00000
	1	-0.105 to 0.105	-0.31 to 0.29	0.02 to 0.12	Rockwell B70	—	5	000000000	00000


	Carbon Steel







					55 mm ID × 68 mm OD

					0.1	-0.013 to 0.013	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	1	00000000	00000


					0.2	-0.045 to 0.045	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	1	00000000	00000
					0.3	-0.072 to 0.072	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	1	00000000	00000
					0.5	-0.064 to 0.064	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	10	00000000	0000
					1	-0.105 to 0.105	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	10	00000000	00000
					1.5	-0.14 to 0.14	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	5	00000000	00000
					2	-0.21 to 0.21	-0.3 to 0.3	-0.5 to 0.5	Rockwell B40	—	5	00000000	00000


					Stress-Resistant Spring Steel







									55 mm ID × 68 mm OD

									0.2	-0.04 to 0	0.03 to 0.4	-0.47 to -0.04	Rockwell B85	DIN 988	5	000000000	0000


									0.3	-0.05 to 0	0.03 to 0.4	-0.47 to -0.04	Rockwell B85	DIN 988	5	000000000	0000
									0.5	-0.05 to 0	0.03 to 0.4	-0.47 to -0.04	Rockwell B85	DIN 988	5	000000000	0000
									1	-0.05 to 0	0.03 to 0.4	-0.47 to -0.04	Rockwell B85	DIN 988	5	000000000	0000

Bearing Locknuts

Carbon Steel

With a nylon insert that grips your threaded shaft or spindle without damaging its threads, these locknuts—also called shaft nuts—hold bearings, bushings, gears, and pulleys prone to vibration tightly in place. They come as one piece, so you can easily clamp them onto your shaft or spindle. But, since they aren’t made entirely of metal, they don’t stand up to heat as well as all-metal locknuts. Slots in their sides mean you can tighten and loosen them with a spanner wrench or spanner socket. Their face is also chamfered to help keep the size and weight of your assembly at a minimum. All meet international standards for bearing locknut dimensions.

Zinc-Plated Carbon Steel—Zinc-plated carbon steel locknuts resist rusting from some moisture, but you shouldn’t use them with salt water or chemicals. They are strong and resist wear, though they don’t stand up to corrosion as well as 303 stainless steel locknuts.

Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.

	Thread					Zinc-Plated Carbon Steel
	Size	Spacing	OD, mm	Wd., mm	Insert Max. Temp., ° F		Each
Chamfered Face



		M50 × 1.5 mm	Extra Fine	68	13	210	0000000	000000

Bearing Nuts

Carbon Steel

Stepped Face

Often paired with spring lock washers to strengthen their hold, these bearing nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket.

Carbon Steel—Carbon steel bearing nuts are strong and resist wear.

Stepped Face—Use stepped-face bearing nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.

Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.

	Nuts								Bearing Lock Washers
	Thread
	Size	Spacing	OD, mm	Wd., mm	Specs. Met	For Lock Washer Specs. Met		Each		Each
Carbon Steel







				Stepped Face

				M45 × 1.5 mm	Extra Fine	68	12	DIN 1804	DIN 462	0000000	000000	000000000	00000

Thin-Profile Bearing Nuts

Used in pairs or with another bearing nut, these thin-profile nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle. Threading two nuts tightly against each other makes it harder for vibration to loosen your assembly than if you used only one nut. For the nut closer to the bearing, position the stepped face towards the bearing. These thin-profile nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. All meet DIN 1816, an international standard for bearing locknut dimensions.

Carbon Steel—Carbon steel bearing nuts are strong and resist wear.

Thread Spacing—When choosing your thread spacing, consider the precision of your application. The finer the threads, the more control you have when making adjustments.

	Thread
	Size	Spacing	OD, mm	Wd., mm	Specs. Met		Each
Carbon Steel







				Stepped Face

				M45 × 1.5 mm	Extra Fine	68	12	DIN 1816	0000000	000000