55mm Bearings | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	For Shaft Diameter For Shaft Diameter	Show

55mm

	For Shaft Diameter For Shaft Diameter	Hide

	Width Width

	For Housing ID For Housing ID

	Bearing Trade Number Bearing Trade Number

2211
2211K
2311
6011-2RS
6011-2Z
6211
6211-2RS
6211-2Z
6311
6311-2RS
6311-2Z
22211

	OD OD

	ID ID

54.9994mm

55mm

55.06mm

	Bearing Type Bearing Type


Ball	Plain

Roller

	For Load Direction For Load Direction

	Radial
	Combined Radial and Thrust
	Thrust
	Combined Radial, Thrust, and Moment

	Seal Type Seal Type

Open

Sealed

Shielded

	Dynamic Radial Load Capacity Dynamic Radial Load Capacity

	Ball Bearing Type Ball Bearing Type

	Standard

	Maximum Speed Maximum Speed

	For Shaft Type For Shaft Type


Round	Tapered

Keyed

	Lubrication Lubrication

Lubricated

Required

	Construction Construction

Single Row

Double Row

	Shaft Mount Type Shaft Mount Type

	Ball Material Ball Material

Steel

Ceramic

	Lubricant Lubricant

Grease

Grease with Lithium
Thickener

Oil

Solid Polymer

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Maximum Temperature Maximum Temperature

Less than 250° F

250° to 499° F

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

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42 Products

About Plain Bearings

About Ball and Roller Bearings

Ball Bearings

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.

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.

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	Specifications Met		Each
6211	55mm	100mm	21mm	Steel	10,300	6,500	9,500	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	00000000	000000
6311	55mm	120mm	29mm	Steel	17,100	10,600	8,500	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	00000000	00000

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
6011-2Z	55mm	90mm	18mm	Steel	6,700	4,750	9,100	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	00000000	0000000
6211-2Z	55mm	100mm	21mm	Steel	9,750	5,850	6,300	Lubricated	-20° to 230°	ABEC-1	__	00000000	00000
6311-2Z	55mm	120mm	29mm	Steel	16,000	10,100	5,600	Lubricated	-20° to 230°	ABEC-1	__	00000000	00000

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
6011-2RS	55mm	90mm	18mm	Steel	6,700	4,750	4,100	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	00000000	000000
6311-2RS	55mm	120mm	29mm	Steel	17,100	10,600	3,500	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	0000000	00000
6211-2RS	55mm	100mm	21mm	Steel	9,650	6,500	3,900	Lubricated	-20° to 230°	ABEC-1	DIN 625-1	0000000	00000

Permanently Lubricated Ball Bearings

A solid polymer lubricant surrounds the balls, eliminating the need for additional lubrication. Because it's solid, the 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.

					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
Open
6211	55mm	100mm	21mm	Steel	7,500	5,850	3,700	Lubricated	10° to 200°	ABEC-1	00000000	0000000
6311	55mm	120mm	29mm	Steel	13,100	10,100	3,300	Lubricated	10° to 200°	ABEC-1	00000000	000000
Sealed
6011-2RS	55mm	90mm	18mm	Steel	4,900	4,100	4,000	Lubricated	10° to 200°	ABEC-1	00000000	000000
6211-2RS	55mm	100mm	21mm	Steel	7,500	5,850	3,700	Lubricated	10° to 200°	ABEC-1	00000000	000000
6311-2RS	55mm	120mm	29mm	Steel	13,100	10,100	3,300	Lubricated	10° to 200°	ABEC-1	00000000	000000

Self-Aligning Ball Bearings

Open

With a spherical raceway and two rows of balls, these bearings compensate for shaft misalignment.

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.
Bearing Trade Number	For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Misalignment Capability	Temp. Range, °F	ABEC Rating		Each
Open
2211	55	100	25	Steel	6,000	2,200	6,000	Required	4°	Not Rated	ABEC-1	00000000	0000000
2311	55	120	43	Steel	17,150	5,350	4,800	Required	4°	Not Rated	ABEC-1	00000000	000000

Electrically Insulated Ball Bearings

Good for use in electric motors and power generators, these bearings have ceramic balls that insulate against stray current to prevent damage to the bearing. The ceramic balls generate less heat than steel balls, so they require lubrication less frequently. Shields keep out dust and contaminants.

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

					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
Shielded
6211-2Z	55	100	21	Steel	11,400	7,300	9,600	Lubricated	-20° to 245°	ABEC-1	0000000	0000000

Tapered Bore Self-Aligning Ball Bearings

Tapered Shaft

For use on tapered shafts and round shafts with adapter sleeves, these ball-bearings have a spherical raceway to compensate for shaft misalignment.

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

					Radial Load Capacity
Bearing Trade Number	For Shaft Diameter, mm	For Housing ID, mm	Width, mm	Ring Material	Dynamic	Static, lbs.	Maximum Speed, rpm	Lubrication	Misalignment Capability	Maximum Temperature, °F	Rate of Taper	ABEC Rating		Each
Open
2211K	55	100	25	Steel	6,000	2,200	6,000	Required	4°	240°	1:12	ABEC-1	0000000	0000000

Ultra-Thin Ball Bearings

Open

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.

Open bearings dissipate heat more efficiently than shielded 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.

			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
Open
55mm	72mm	9mm	1,950	1,800	Not Rated	Not Rated	Not Rated	Not Rated	10,000	Lubricated	-50° to 130°	ABEC-1	00000000	000000
55mm	80mm	13mm	3,700	3,150	Not Rated	Not Rated	Not Rated	Not Rated	10,000	Lubricated	-50° to 130°	ABEC-1	00000000	00000
Shielded
55mm	72mm	9mm	1,950	1,800	Not Rated	Not Rated	Not Rated	Not Rated	8,700	Lubricated	-40° to 150°	ABEC-1	00000000	00000
55mm	80mm	13mm	3,700	3,150	Not Rated	Not Rated	Not Rated	Not Rated	8,700	Lubricated	-40° to 150°	ABEC-1	00000000	00000

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
55mm	78mm	18mm	Steel	Steel	8,400	21,000	3,000	Required	-40° to 240°	Two Washers	0000000	000000
55mm	90mm	25mm	Steel	Steel	15,600	35,700	3,000	Required	-40° to 250°	Two Washers	00000000	000000

Multipurpose Sleeve Bearings

These 660 leaded bronze bearings are strong, wear resistant, and excellent at handling shock loads. They’re sometimes called 932 bronze bearings.

Note: Dynamic load capacity is the maximum load a bearing can withstand at a given shaft speed. If your application’s load and speed requirements are below the values listed, the bearing will work.

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

Metric 660 Leaded Bronze Bearings
For Housing ID	Lg.	Dynamic Radial Load Capacity	Lubrication	Temperature Range, °F		Each
For 55mm Shaft Dia.
70mm	50mm	17,050 lbs. @ 30 rpm	Required	-350° to 450°	00000000	000000
70mm	75mm	25,550 lbs. @ 30 rpm	Required	-350° to 450°	00000000	00000
70mm	100mm	34,100 lbs. @ 30 rpm	Required	-350° to 450°	00000000	00000

Face-Mount Crossed-Roller Bearings

Mounting holes on the inner and outer rings allow for fastening onto hollow joints and shafts. The rollers face in alternating directions to allow for rigid, accurate motion under any combination of radial, thrust, and moment (twisting) loads. Use in applications where highly accurate motion is necessary, such as machine tools and industrial robots.

Open bearings dissipate heat more efficiently than sealed bearings.

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

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

				Combined Load Cap., lbs.
For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Temp. Range, °F	Features		Each
Open
55	120	15	Steel	4,500	6,200	850	Required	0° to 230°	Lubrication Groove, Two Lubrication Holes	0000000	0000000
Sealed
55	120	15	Steel	4,500	6,200	650	Lubricated	0° to 210°	Lubrication Groove, Two Lubrication Holes	0000000	000000

Spherical-Roller Bearings

Two rows of rollers give these bearings dynamic radial load capacities over five times higher than comparably sized tapered-roller bearings. Also known as rock crusher bearings, they handle heavy shock loads and are used for metal milling machinery, mining and oil field equipment, and in paper mills.

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

					Combined Load Cap., lbs.
For Shaft Dia., mm	For Housing ID, mm	Wd., mm	Bearing Trade Number	Ring Material	Dynamic	Static	Max. Speed, rpm	Lubrication	Max. Temp. Range, °F		Each
Open
55	100	25	22211	Steel	33,400	32,300	5,300	Required	390	000000	0000000

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
55mm	63mm	20mm	Steel	7,050	15,050	4,850	Required	8	-20° to 280°	DIN 618, ISO 3245	00000000	000000

Needle-Roller Thrust Bearings

Thinner rollers allow these bearings to fit in tighter spaces than tapered-roller thrust bearings. Because of the large contact area between the rollers and washers (not included), these bearings are great for medium to heavy duty, low-friction jobs. For use on hardened and ground surfaces.

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

Bearings

Bearing

			Thrust Load Cap., lbs.
For Shaft Dia.	OD	Thick.	Dynamic	Static	Max. Speed, rpm	Lubrication	For Shaft Surface Smoothness (Ra), microns	Temp. Range, °F	Specifications Met		Each
Steel Rollers
Open
55mm	78mm	3mm	8,500	41,800	4,300	Required	0.2	0° to 240°	DIN 5405-2	0000000	000000

Washers

Washer

For Shaft Dia.	OD	Thick.	Washer Material	Specifications Met		Each
55mm	78mm	1mm	Steel	DIN 5405-3, ISO 303	0000000	00000
55mm	78mm	5mm	Steel	__	0000000	00000

Washers for Needle-Roller Thrust Bearings

Washer

Adapt needle-roller thrust bearings to use on unhardened, unground surfaces.

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

For Shaft Dia.	OD	Thick.	Washer Material	Specifications Met		Each
55mm	78mm	1mm	Steel	DIN 5405-3, ISO 303	0000000	00000
55mm	78mm	5mm	Steel	__	0000000	00000

Mounted Ball Bearings

Bearings are self-aligning to compensate for shaft misalignment. Seals block out dust and contaminants.

Bearing with concentric lock use adapter sleeves (sold separately) to lock onto shafts in a way that enables high running speeds with little vibration. They work for applications that require reversing because they allow shafts to rotate in both directions.

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

Bearings

With Concentric Lock

		Overall			Mounting			Radial Load Cap., lbs.
For Shaft Dia.	Center Ht.	Ht.	Lg.	Wd.	Hole Lg.	Hole Wd.	Hole Ctr.-to-Ctr.	Dynamic	Static	Max. Speed, rpm	Temp. Range, °F	Alignment Style	Lubrication		Each
Sealed Steel Bearings with Cast Iron Housing
Shaft Mount Type: Concentric Lock
55mm	69.8mm	138mm	241mm	66.8mm	29.5mm	20mm	188.5mm	11,800	8,050	3,400	-20° to 210°	Self Aligning	Lubricated	00000000	0000000

Adapter Sleeves for Bearings with Concentric Lock

Adapter Sleeve

1137 Carbon Steel Sleeves
For Shaft Diameter, mm	ID, mm	Width, mm	Includes		Each
55	55	62	Lock Nut, Lock Washer	00000000	0000000

Mounted Roller Bearings

Roller bearings have a thinner profile and larger contact area than ball bearings, making them stronger and more space-efficient than ball bearings.

Sealed bearings block out dust and contaminants.

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

Sealed Tapered-Roller Bearings

Sealed Tapered-Roller Bearing

		Overall			Mounting			Radial Load Cap., lbs.
For Shaft Dia.	Center Ht.	Ht.	Lg.	Wd.	Hole Lg.	Hole Wd.	Hole Ctr.-to-Ctr.	Dynamic	Static	Dynamic Thrust Load Cap., lbs.	Max. Speed, rpm	Temp. Range, °F	Alignment Style	Lubrication		Each
Steel Bearings with Cast Iron Housing—Shaft Mount Type: Set Screw
55mm	2 1/2"	5"	9 5/8"	3 3/4"	7/8"	3/4"	7 3/4"	10,900	48,200	3,450	2,700	-60° to 250°	Fixed Alignment	Lubricated	0000000	0000000

Mounted Ball Bearings with Four-Bolt Flange

Bearings are self-aligning to compensate for shaft misalignment. Seals block out dust and contaminants.

Set screw bearings secure to shafts as you tighten their screw. They don’t need a collar, but the screw leaves some marring on shafts. Use them in applications where shafts rotate in both directions.

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

Bearings

Set Screw Mount

	Overall				Mounting		Radial Load Cap., lbs.
For Shaft Dia.	Ht.	Lg.	Wd.	Flange Thick.	Hole Dia.	Hole Ctr.-to-Ctr.	Dynamic	Static	Max. Speed, rpm	Temp. Range, °F	Alignment Style	Lubrication		Each
Sealed Steel Bearings with Cast Iron Housing
Shaft Mount Type: Set Screw
55mm	161.9mm	161.9mm	58.7mm	20.6mm	16.7mm	130.2mm	9,750	6,600	3,200	-20° to 220°	Self Aligning	Lubricated	000000	0000000

Insert Bearings

Swap out worn inserts instead of replacing the entire mounted unit. Use the manufacturer model number on your existing mounted bearing to choose a compatible insert. Inserts must be used with the manufacturer model number specified.

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

Sealmaster Steel Insert Bearings
For Shaft Dia.	For Mounted Bearing Model No.		Each
Shaft Mount Type: Set Screw
55mm	NP-211, NPL-211, SC-211, SFC-211, SFT-211, SP-211, ST-211	00000000	0000000

Flush-Mount Screw-Clamp Bushings

Insert these bushings into the bore of your sprocket for flush or recessed mounting. They handle shock loads and have higher torque ratings than self-centering bushings. When you tighten the included clamping screws, the bushing's inner sleeve contracts onto the shaft and the outer sleeve expands to hold your sprocket, pulley, or gear. They can be mounted on shafts with or without keyways.

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

For Shaft Dia.	OD	Overall Wd.	Max. Torque, in.-lbs.	Fastener Tightening Torque, in.-lbs.	Material	Includes		Each
55mm	85mm	66mm	45,100	363	Steel	Clamping Screws	0000000	0000000

Quick-Disconnect (QD) Bushings

Clamp On

The screw connections on these bushings easily mate to compatible quick-disconnect sprockets and pulleys. Bushings fit quick-disconnect (QD) sprockets and pulleys of the same bushing style. As you tighten the included screws, the bushing grips the shaft and pulls it into the sprocket or pulley.

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

		Keyway
For Shaft Dia.	Overall Wd.	Wd.	Dp.	Fastener Tightening Torque, in.-lbs.	Material	Includes		Each
Clamp On
SF Style Bushing
55mm	64mm	16mm	4.3mm	360	Steel	Clamping Screws	0000000	000000
SK Style Bushing
55mm	55mm	16mm	4.3mm	180	Cast Iron	Clamping Screws	0000000	00000

Taper-Lock Bushings

Mount these hubless bushings flush into your sprocket or pulley for a slim profile with no protruding screws. They are for use with taper-lock sprockets of the same bushing style. As you tighten the included set screws, the bushing grips the shaft and pulls it into your sprocket or pulley.

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

		Keyway
For Shaft Dia.	Overall Wd.	Wd.	Dp.	Taper	Fastener Tightening Torque, in.-lbs.	Material	Includes		Each
3020 Style Bushing
55mm	51mm	16mm	4.3mm	8°	800	Steel	Set Screws	000000000	000000