37mm 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







				Steel

				12	37	12	1	2,150	28,500	-20	230	Standard	6301	5972K318	00000


				20	37	9	1	1,400	19,000	-20	230	Standard	6904	5972K245	00000
				25	37	7	1	960	18,000	-20	230	Standard	6805	5972K216	00000
				30	37	4	1	250	7,000	-50	130	Standard	6706	6656K116	00000




						Corrosion-Resistant 440C Stainless Steel

						12	37	12	1	1,850	25,000	-40	240	Standard	6301	6153K128	00000


						30	37	4	1	250	7,000	-50	130	Standard	6706	6656K117	00000


						Shielded







										Steel

										12	37	12	1	2,150	20,000	-20	230	Standard	6301-2Z	5972K347	00000


										12	37	12	3	2,250	22,000	-20	230	Standard	6301-2Z	6661K62	00000
										20	37	9	1	1,400	19,000	-20	230	Standard	6904-2Z	5972K168	00000
										25	37	7	1	960	18,000	-20	230	Standard	6805-2Z	5972K158	00000




												Corrosion-Resistant 440C Stainless Steel

												12	37	12	1	1,850	22,000	-40	240	Standard	6301-2Z	6153K154	00000


												25	37	7	1	960	18,000	-40	150	Standard	6805-2Z	6656K207	00000


												Sealed







																Steel

12	37															12	1	2,150	13,000	-20	230	Standard	6301-2RS	5972K86	00000


12	37															12	3	2,250	14,000	-30	210	Standard	6301-2RS	6661K122	00000
20	37	9														1	1,400	19,000	-20	230	Standard	6904-2RS	5972K291	0000
25	37	7	1													960	18,000	-20	230	Standard	6805-2RS	5972K281	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







				Steel

				12	37	12	1	1,700	12,000	10	200	Standard	6301	2349K712	000000


				20	37	9	1	1,400	10,500	10	200	Standard	6904	2349K737	00000
				25	37	7	1	390	9,500	10	200	Standard	6805	2349K731	00000




						Corrosion-Resistant 440C Stainless Steel

						20	37	9	1	1,400	10,000	-10	200	Standard	6904	4668K168	00000


						30	37	4	1	250	9,000	-10	200	Standard	6706	4668K148	00000


						Sealed







										Steel

										12	37	12	1	1,700	12,000	10	200	Standard	6301-2RS	2349K767	00000


										20	37	9	1	1,430	10,500	10	200	Standard	6904-2RS	2349K793	00000
										25	37	7	1	850	9,600	10	200	Standard	6805-2RS	2349K786	00000




												Corrosion-Resistant 440C Stainless Steel

												12	37	12	1	1,700	12,000	-10	200	Standard	6301-2RS	4668K314	00000


												20	37	9	1	1,400	10,000	-10	200	Standard	6904-2RS	4668K278	00000
												25	37	7	1	960	9,000	-10	200	Standard	6805-2RS	4668K267	00000
												30	37	4	1	250	9,000	-10	200	Standard	6706-2RS	4668K258	00000

Flanged Ball Bearings

Open

Shielded

Install these bearings inside a housing and they won't budge. The flange presses against the housing wall, so vibration and other sudden forces parallel to the shaft (thrust loads) won't knock them off-kilter.

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.

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

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







				Steel

				30	37	4	39	1	1	250	7,000	-50	280	Standard	6706	4390N145	000000


				Shielded







								Steel

								20	37	9	40	2	1	1,400	19,000	-50	300	Standard	6904-2Z	4390N177	00000


								25	37	7	40	1.5	1	960	18,000	-50	300	Standard	6805-2Z	4390N178	00000

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

				12	37	12	1	1,850	12,000	-40	200	Standard	FDA Compliant 21 CFR 178.3570	6301-2RS	4648K22	000000


				20	37	9	1	1,200	10,000	-40	200	Standard	FDA Compliant 21 CFR 178.3570	6904-2RS	4648K241	00000
				25	37	7	1	820	9,000	-40	200	Standard	FDA Compliant 21 CFR 178.3570	6805-2RS	4648K232	00000
				30	37	4	1	250	5,500	-40	200	Standard	FDA Compliant 21 CFR 178.3570	6706-2RS	4648K326	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 Bearing—Open bearings dissipate heat more efficiently than sealed bearings.

Sealed Bearing—Sealed bearings block out dust and other contaminants better than open bearings, but retain more heat.

				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



		30	37	12	2,700	4,100	8,600	Required	8	-40 to 280	DIN 618, ISO 3245	5905K362	000000


		30	37	16	3,850	6,500	8,600	Required	8	-20 to 280	DIN 618, ISO 3245	5905K552	00000
		30	37	20	4,900	8,850	8,600	Required	8	-20 to 280	DIN 618, ISO 3245	5905K553	00000
		30	37	26	6,250	12,100	8,600	Required	8	-20 to 280	DIN 618, ISO 3245	5905K554	00000
		30	37	38	8,400	17,750	8,600	Required	8	-20 to 280	DIN 618, ISO 3245	5905K555	00000


		For Radial Load—Sealed on One Side with Steel Ring



				30	37	18	3,850	6,500	5,200	Lubricated	8	0 to 210	DIN 618	5905K578	00000


				For Radial Load—Sealed on Both Sides with Steel Ring



						30	37	16	2,700	4,050	5,200	Lubricated	8	0 to 210	DIN 618	5905K597	00000


						30	37	20	3,850	6,500	5,200	Lubricated	8	0 to 210	DIN 618	5905K598	00000

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

				12	37	12	3	Steel	2,350	24,000	Required	40°	-40	300	7301	6680K23	000000

Combination Ball/Needle-Roller Bearings

A built-in thrust ball bearing reduces wear from adjacent shaft components, while the needle rollers support high radial loads. Install anywhere you would use separate bearings for radial and thrust loads.

						Radial Load Cap., lb.		Thrust Load Cap., lb.
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ball Bearing OD, mm	Ball Bearing Wd., mm	Dynamic	Static	Dynamic	Static	Max. Rotation Speed, rpm	Lubrication	For Shaft Surface Smoothness, Ra, μin	Temp. Range, ° F	Features		Each
For Combined Radial and Thrust Load—Open with Steel Ring



		25	37	30	43	11	4,250	6,700	4,050	6,670	6,300	Required	8	-20 to 230	Lubrication Groove, Lubrication Hole	1418N105	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



	20	37	12	Steel	3,350	7,500	-40 to 240	Two Washers	6681K15	000000

One-Way Locking Needle-Roller Bearing Clutches

Triple-Row

Bearing

The needles in these bearings roll freely in one direction, but lock to transmit torque when the rotation of the shaft is reversed. Also known as drawn-cup roller clutches. An arrow on the lip indicates the rotational direction that locks the bearings.

Triple-Row Bearing—Triple-row bearings support radial loads.

301 Stainless Steel Springs—Bearings with 301 stainless steel springs handle higher temperatures than bearings with acetal springs.

					Radial Load Cap., lb.
	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Rotation Speed, rpm	Max. Torque, ft·lbf	Lubrication	For Shaft Surface Smoothness, Ra, μin	Temp. Range, ° F		Each
Triple-Row Bearing







				301 Stainless Steel Springs

				30	37	30	Steel	2,550	3,350	7,300	70	Required	16	-20 to 250	1553N17	0000000

Mounted Linear Bearings for Ball Splines

A flange with mounting holes makes it easy to attach a load to these bearings. Create a compact linear and rotary motion system for robots and other applications requiring complex, fast movements, by combining them with ball splines. These bearings move smoothly and precisely even at high speeds along ball splines while grooves on the ball spline transmit rotary power. Clip a retaining ring (not included) into the groove on these bearings to position them in your system.

Steel Bearings


		For 4 Splines

												Groove, mm
For Spline Dia., mm	For No. of Splines	Overall Lg., mm	Flange OD, mm	Bolt Circle Dia., mm	OD, mm	Dynamic Load Cap., lb.	Static Load Cap., lb.	Max. Dynamic Torque, in·lbf	Max. Static Torque, in·lbf	Max. Temp., ° F	With Retaining Ring Grooves	Wd.	Dia.	No. of Mounting Holes		Each



	23	4	70	60	47	37	2,750	3,600	1,433	2,115	176	Yes	3.5	36.1	4	61145K47	0000000