68mm OD Bearings | McMaster-Carr

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About Ball and Roller Bearings

About Shaft Collars

Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.

Ball Bearings

Shielded bearings block out dust and other contaminants, but do not dissipate heat as efficiently as open bearings.

Sealed bearings block out dust and other contaminants better than open and shielded bearings, but retain the most heat.

For technical drawings and 3-D models, click on a part number.

Shielded

					Radial Load Cap., lbs.
Bearing Trade Number	For Shaft Dia.	For Housing ID	Wd.	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating	Specifications Met		Each
6008-2Z	40mm	68mm	15mm	Steel	4,000	2,550	12,000	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	00000000	000000

Sealed

					Radial Load Cap., lbs.
Bearing Trade Number	For Shaft Dia.	For Housing ID	Wd.	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating	Specifications Met		Each
6008-2RS	40mm	68mm	15mm	Steel	4,000	2,550	5,400	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	00000000	000000

Stainless Steel Ball Bearings

Bearings are 440C stainless steel for good corrosion resistance.

Open bearings dissipate heat more efficiently than shielded and sealed bearings.

Shielded bearings block out dust and other contaminants, but do not dissipate heat as efficiently as open bearings.

For technical drawings and 3-D models, click on a part number.

Open

					Radial Load Cap., lbs.
Bearing Trade Number	For Shaft Dia.	For Housing ID	Wd.	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating		Each
6008	40mm	68mm	15mm	440C Stainless Steel	3,200	2,050	12,000	Lubricated	-40° to 240°	ABEC-1	00000000	0000000

Shielded

					Radial Load Cap., lbs.
Bearing Trade Number	For Shaft Dia.	For Housing ID	Wd.	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating		Each
6008-2Z	40mm	68mm	15mm	440C Stainless Steel	3,200	2,050	10,000	Lubricated	-40° to 240°	ABEC-1	00000000	0000000

Permanently Lubricated Stainless Steel Ball Bearings

A solid polymer lubricant surrounds the balls, eliminating the need for additional lubrication. The solid lubricant blocks out water and dust, extending the life of the bearing.

Sealed bearings have even better resistance to dust and contaminants than open bearings.

For technical drawings and 3-D models, click on a part number.

Metric Bearings

					Radial Load Cap., lbs.
Bearing Trade Number	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating		Each
Open
6008	40	68	15	440C Stainless Steel	2,900	2,200	5,000	Lubricated	-10° to 200°	ABEC-1	00000000	0000000
6909	45	68	12	440C Stainless Steel	3,150	2,400	5,000	Lubricated	-10° to 200°	ABEC-1	00000000	000000
Sealed
6008-2RS	40	68	15	440C Stainless Steel	2,900	2,200	5,000	Lubricated	-10° to 200°	ABEC-1	00000000	000000
6909-2RS	45	68	12	440C Stainless Steel	3,150	2,400	5,000	Lubricated	-10° to 200°	ABEC-1	00000000	000000

Food Industry Permanently Lubricated Stainless Steel Ball Bearings

Good for applications with incidental food contact, these 440C stainless steel bearings have a food-grade, solid polymer lubricant between the balls and ring that eliminates the need for additional lubrication. The solid lubricant blocks out water and dust, extending the life of the bearing.

Sealed bearings have even better resistance to dust and contaminants than open bearings.

For technical drawings and 3-D models, click on a part number.

Metric Bearings

					Radial Load Cap., lbs.
Bearing Trade Number	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating	Specifications Met		Each
Sealed
6008-2RS	40	68	15	440C Stainless Steel	3,200	2,050	5,000	Lubricated	-40° to 200°	ABEC-1	FDA Compliant 21 CFR 178.3570	00000000	0000000
6909-2RS	45	68	12	440C Stainless Steel	2,650	1,950	5,000	Lubricated	-40° to 200°	ABEC-1	FDA Compliant 21 CFR 178.3570	00000000	000000

Angular-Contact Thrust Ball Bearings

Open

Install these bearings for use with combined radial and thrust loads. They are often used in spindle applications and can be combined with cylindrical roller bearings to better handle radial loads.

Single-row bearings handle thrust loads on one side. For applications with thrust loads on both sides, mount them in pairs.

Open bearings dissipate heat more efficiently than shielded and sealed bearings.

For technical drawings and 3-D models, click on a part number.

					Combined Load Cap., lbs.
Bearing Trade Number	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Contact Angle	Temp. Range, °F	ABEC Rating		Each
Single Row
Open
7008	40	68	15	Steel	3,750	2,450	20,000	Required	15°	-30° to 140°	ABEC-7	0000000	0000000

Ultra-Thin Ball Bearings

Shielded

These bearings have twice as many contact points as angular-contact ball bearings. Fit onto large-diameter hollow shafts to run air and hydraulic lines, electrical wiring, and other components through moving parts in assemblies such as index and rotary tables, packaging equipment, and robotics.

Shielded bearings block out dust and other contaminants, but do not dissipate heat as efficiently as open bearings.

For technical drawings and 3-D models, click on a part number.

			Radial Load Cap., lbs.		Thrust Load Cap., lbs.		Moment Load Cap., ft.-lbs.
For Shaft Dia.	For Housing ID	Wd.	Dynamic	Static	Dynamic	Static	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	ABEC Rating		Each
Steel Ring
Shielded
45mm	68mm	12mm	3,150	2,400	Not Rated	Not Rated	Not Rated	Not Rated	9,700	Lubricated	-40° to 150°	ABEC-1	00000000	000000

Thrust Ball Bearings

Steel balls and washers allow these bearings to handle higher loads than bearings with stainless steel components. With an open design, they dissipate heat more efficiently than one-piece thrust ball bearings.

Bearings with steel cage and with bronze cage handle higher loads and speeds than bearings with a plastic cage.

For technical drawings and 3-D models, click on a part number.

					Thrust Load Cap., lbs.
For Shaft Dia.	OD	Thick.	Cage Material	Washer Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	Includes		Each
Open
40mm	68mm	19mm	Steel	Steel	10,500	22,100	3,900	Required	-40° to 250°	Two Washers	00000000	000000
45mm	68mm	16mm	Steel	Steel	6,500	14,600	3,600	Required	-40° to 240°	Two Washers	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.

For technical drawings and 3-D models, click on a part number.

				Radial Load Cap., lbs.		Thrust Load Cap., lbs.
For Shaft Dia.	For Housing ID	Wd.	Bearing Trade Number	Dynamic	Static	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F		Each
Steel Ring
Open
40mm	68mm	14.5mm	32008	3,000	16,100	1,900	17,700	2,700	Required	-60° to 200°	0000000	000000
40mm	68mm	14.5mm	32008	10,550	15,100	6,650	Not Rated	5,300	Required	-50° to 300°	0000000	00000

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 bearings dissipate heat more efficiently than sealed bearings.

For technical drawings and 3-D models, click on a part number.

				Radial Load Cap., lbs.
For Shaft Dia.	For Housing ID	Wd.	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	For Shaft Surface Smoothness (Ra), microinch	Temp. Range, °F	Specifications Met		Each
Open
60mm	68mm	12mm	Steel	3,900	7,150	4,450	Required	8	-20° to 280°	DIN 618, ISO 3245	00000000	000000
60mm	68mm	20mm	Steel	7,500	16,850	4,450	Required	8	-20° to 280°	DIN 618, ISO 3245	00000000	00000
60mm	68mm	32mm	Steel	11,900	30,300	4,450	Required	8	-20° to 280°	DIN 618, ISO 3245	00000000	00000

Bearing Retaining Locknuts

Zinc-Plated 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.

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

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

For technical drawings and 3-D models, click on a part number.

Metric

Thread							Zinc-Plated Carbon Steel
Size	Pitch, mm	Spacing	OD	Wd., mm	Insert Max. Temp., °F	Specifications Met		Each
Chamfered Face
M50	1.5	Extra Fine	68mm	13	210°	DIN 1805	0000000	000000

Bearing Retaining Nuts

Stepped

Often paired with spring lock washers to strengthen their hold, these retaining 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. Made of carbon steel, they’re strong and wear resistant.

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

For technical drawings and 3-D models, click on a part number.

Nuts
Thread									Optional Washers
Size	Pitch, mm	Spacing	OD, mm	Wd., mm	Specifications Met	For Lock Washer Specifications Met		Each		Each
Carbon Steel
Stepped Face
M45	1.5	Extra Fine	68	12	DIN 1804	DIN 462	0000000	000000	000000000	00000

Bearing Retaining Jam Nuts

Used in pairs or with another bearing retaining nut, these jam 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 jam nuts have holes on the side, so you can tighten and loosen them with a pin spanner wrench. Made of carbon steel, they’re strong and wear resistant. All meet DIN 1816, an international standard for bearing locknut dimensions.

For technical drawings and 3-D models, click on a part number.

Thread
Size	Pitch, mm	Spacing	OD, mm	Wd., mm	Specifications Met		Each
Carbon Steel
Stepped Face
M45	1.5	Extra Fine	68	12	DIN 1816	0000000	000000

Ring Shims

Precisely align, level, and adjust spacing on fasteners, shafts, and machinery with these shims.

For accurate leveling, choose materials such as steel or stainless steel, which are hard enough to resist scratching and deforming. Softer shims, like copper or aluminum, can be used as wear plates between components that rub together, preventing damage to equipment.

Stainless steel shims are more corrosion resistant than steel shims.Carbon steel shims have excellent strength and can be welded, but aren't as corrosion resistant as other shims.

Spring steel shims are comparable in strength to carbon steel shims, but are harder and hold their shape better. They aren't as corrosion resistant as other shims.

For technical drawings and 3-D models, click on a part number.

18-8 Stainless Steel

0.1 mm Thick. (-0.013 mm to 0.013 mm Tolerance)
ID	ID Tolerance	OD	OD Tolerance	Material	Min. Hardness	Pkg. Qty.		Pkg.
55mm	-0.3mm to 0.3mm	68mm	-0.05mm to 0.05mm	18-8 Stainless Steel	Rockwell B70	5	000000000	000000
0.2 mm Thick. (-0.023 mm to 0.023 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.05mm to 0.05mm	18-8 Stainless Steel	Rockwell B70	5	000000000	00000
0.3 mm Thick. (-0.055 mm to 0.055 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.05mm to 0.05mm	18-8 Stainless Steel	Rockwell B70	5	000000000	00000
0.5 mm Thick. (-0.064 mm to 0.064 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.05mm to 0.05mm	18-8 Stainless Steel	Rockwell B70	5	000000000	00000
1 mm Thick. (-0.105 mm to 0.105 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.05mm to 0.05mm	18-8 Stainless Steel	Rockwell B70	5	000000000	00000

Carbon Steel

2 mm Thick. (-0.21 mm to 0.21 mm Tolerance)
ID	ID Tolerance	OD	OD Tolerance	Material	Min. Hardness	Pkg. Qty.		Pkg.
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	Carbon Steel	Rockwell B40	5	00000000	000000

1008-1010 Carbon Steel

0.1 mm Thick. (-0.013 mm to 0.013 mm Tolerance)
ID	ID Tolerance	OD	OD Tolerance	Material	Min. Hardness	Pkg. Qty.		Pkg.
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	1008-1010 Carbon Steel	Rockwell B40	1	00000000	000000
0.2 mm Thick. (-0.045 mm to 0.045 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	1008-1010 Carbon Steel	Rockwell B40	1	00000000	00000
0.3 mm Thick. (-0.072 mm to 0.072 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	1008-1010 Carbon Steel	Rockwell B40	1	00000000	00000
0.5 mm Thick. (-0.064 mm to 0.064 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	1008-1010 Carbon Steel	Rockwell B40	10	00000000	0000
1 mm Thick. (-0.105 mm to 0.105 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	1008-1010 Carbon Steel	Rockwell B40	10	00000000	00000
1.5 mm Thick. (-0.14 mm to 0.14 mm Tolerance)
55mm	-0.3mm to 0.3mm	68mm	-0.5mm to 0.5mm	1008-1010 Carbon Steel	Rockwell B40	5	00000000	00000

1074-1095 Spring Steel

0.2 mm Thick. (-0.04 mm to 0 mm Tolerance)
ID	ID Tolerance	OD	OD Tolerance	Material	Min. Hardness	Specifications Met	Pkg. Qty.		Pkg.
55mm	0.03mm to 0.4mm	68mm	-0.47mm to -0.04mm	1074-1095 Spring Steel	Rockwell B85	DIN 988	5	000000000	00000
0.3 mm Thick. (-0.05 mm to 0 mm Tolerance)
55mm	0.03mm to 0.4mm	68mm	-0.47mm to -0.04mm	1074-1095 Spring Steel	Rockwell B85	DIN 988	5	000000000	0000
0.5 mm Thick. (-0.05 mm to 0 mm Tolerance)
55mm	0.03mm to 0.4mm	68mm	-0.47mm to -0.04mm	1074-1095 Spring Steel	Rockwell B85	DIN 988	5	000000000	0000
1 mm Thick. (-0.05 mm to 0 mm Tolerance)
55mm	0.03mm to 0.4mm	68mm	-0.47mm to -0.04mm	1074-1095 Spring Steel	Rockwell B85	DIN 988	5	000000000	0000