Deep Groove Ball Bearings: Types, Sizes, Load Ratings Guide

Deep Groove Ball Bearings carry more of the world's rotating load than any other rolling bearing type. Open a washing machine, a cooling fan, a pump motor or an electric scooter hub, and chances are that one or more Deep Groove Ball Bearings sit on the shaft. This technical reference is written from the factory floor. It explains how Deep Groove Ball Bearings are built, how the numbers on a drawing translate into real performance, how to choose between series, seals, cages, clearances and greases, and what is checked before a bearing leaves production.

3 – 130 mmStandard bore range for Deep Groove Ball Bearings, from instrument sizes to industrial sizes

P0 – P2Precision classes available, from general purpose to ultra-precise spindles

-40 to +250 °COperating window depending on grease, seal and cage selection

ISO 281Basis for the L10 rating life figures quoted in this guide

Deep Groove Ball Bearings at a Glance

Direct Answer

A deep groove ball bearing is a single-row radial rolling bearing whose inner and outer rings both carry a continuous, deep raceway groove. The grooves match the ball radius closely, so the bearing supports radial load, axial load in either direction, and combined load at high speed with low friction, low noise and almost no maintenance. It is non-separable, available open, shielded or sealed, and is the default choice for general-purpose rotating machinery.

Best fit for Deep Groove Ball Bearings

Radial load combined with light to moderate axial load in both directions
Speeds from a few hundred to more than 20,000 r/min depending on size
Applications where low noise and low vibration matter
Housings that cannot be opened for re-greasing
Series production where one part number must fit every unit

Consider a different bearing type when

Heavy shock or impact loads dominate the duty cycle
Shaft deflection or housing misalignment exceeds roughly 10 arc minutes
Axial load is large compared with radial load
The bearing oscillates through very small angles under heavy load
Radial space is tight but radial load is very high

Because the raceway grooves are deep and closely matched to the balls, Deep Groove Ball Bearings tolerate modest axial forces without any special arrangement. One bearing at each end of a shaft is often enough to locate a complete rotor. That simplicity explains why designers keep returning to Deep Groove Ball Bearings, from compact miniature sizes to large industrial sizes.

Construction of Deep Groove Ball Bearings: Four Parts, Many Design Choices

Every Deep Groove Ball Bearing is built from an inner ring, an outer ring, a set of balls and a cage. Seals or shields are added for protection. Each element offers choices that change cost, life, speed and noise, so a drawing that looks identical from the outside can behave very differently in service.

Inner ring

Turned from forged or rolled tube blanks, hardened, then ground on bore, faces and raceway. Bore accuracy and raceway roundness set how smoothly the bearing runs and how well it seats on the shaft.

Outer ring

Carries the outer raceway and, on sealed versions, the seal groove. Its outside diameter must hold tight tolerance to give a uniform fit in the housing. Variants include plain, snap ring groove and flanged outer rings.

Balls

Normally chromium steel balls in grades G10 to G28. A lower grade number means better sphericity and size consistency. Premium quiet-running motor bearings generally use G10 or better.

Cage

Separates the balls and guides them evenly around the raceway. The cage material controls friction, noise, temperature limits and how the bearing responds to vibration.

Raceway Conformity and Ball Complement

The groove radius in Deep Groove Ball Bearings is typically about 52 percent of the ball diameter. A tighter groove increases the contact area and raises load capacity, but it also increases friction and sensitivity to misalignment. Most designs settle close to the 52 percent value because it balances capacity with low torque. Assembly follows the eccentric (Conrad) method. The inner ring is shifted to one side, balls are loaded into the crescent-shaped gap, the balls are spread evenly, and the cage is fitted. This method limits the number of balls that fit, which is why Deep Groove Ball Bearings carry less radial load than filling-slot designs of the same size. In return, the uninterrupted raceway gives smoother running and better axial strength.

Cage Types Compared

Cage type	Temperature limit	Speed capability	Noise level	Typical use
Pressed steel (riveted or snap)	Up to 300 °C, limited by grease	Medium to high	Moderate	General machinery, pumps, gearboxes
Polyamide PA66-GF25	-40 to +120 °C, peaks to 150 °C	High	Low	Household appliances, small motors, fans
Machined or pressed brass	Up to 250 °C	Medium to high	Moderate	Vibrating equipment, compressors, heavy-duty motors
PEEK	Up to 200 °C or higher	Very high	Low	Chemical exposure, high-speed spindles

Reading Deep Groove Ball Bearing Designations Without Guesswork

The designation printed on a bearing is a compact specification. The first digit gives the bearing type, where 6 means Deep Groove Ball Bearings. The next digit gives the dimension series (width and diameter series combined). The last two digits give the bore. From code 04 upward, multiply by 5 to get the bore in millimetres, so 05 means 25 mm, 08 means 40 mm and 12 means 60 mm. Four codes break this rule: 00 equals 10 mm, 01 equals 12 mm, 02 equals 15 mm and 03 equals 17 mm.

Suffix	Meaning	Practical effect
Z / ZZ	Metal shield on one / both sides	Low friction, protection against coarse particles, no contact with the inner ring
RS / 2RS	Contact rubber seal on one / both sides	Better exclusion of dust and splash water, higher friction, lower speed limit
RZ / 2RZ	Non-contact rubber seal on one / both sides	Compromise between sealing and friction
C2, C3, C4	Radial internal clearance smaller or larger than CN	Adjusts to fit, temperature and load conditions
P6, P5, P4	Higher dimensional and running accuracy	Lower runout, quieter operation, higher achievable speed
N / NR	Snap ring groove / groove with snap ring	Axial location in the housing without a shoulder
Z3, V3	Low-vibration grade marking	Selected for quiet applications
F prefix	Flanged outer ring	Simplifies housing design and axial positioning

Example 1

6204-2RS C3

Deep Groove Ball Bearings, 02 diameter series, 20 mm bore, contact seals on both sides, clearance larger than normal. A very common specification for small electric motors and agricultural machinery.

Example 2

6305-ZZ P6

03 diameter series, 25 mm bore, metal shields on both sides, tighter running accuracy. Suitable for gearbox input shafts and machine tool auxiliaries where speed is moderate and precision matters.

Example 3

6006-2RZ

00 dimension series with 30 mm bore, non-contact seals on both sides. Chosen for blowers and fans that need a balance of sealing and low torque.

Choosing Between 69, 60, 62, 63 and 64 Series at the Same Bore

Many shaft sizes accept several Deep Groove Ball Bearings of different outer diameters. Moving to a heavier series increases ball size and width, which lifts load capacity, but it also increases mass, friction and the housing space required. The table below compares five series at a 25 mm bore. Values are typical catalogue-level reference figures; confirm against the approved drawing before final design.

Designation	Series	d × D × B (mm)	Cr (kN)	C0r (kN)	Grease limiting speed (r/min)	Mass (kg)
6905	69 extra light	25 × 42 × 9	7.02	3.55	18000	0.06
6005	60 light	25 × 47 × 12	10.1	5.85	16000	0.08
6205	62 medium	25 × 52 × 15	14.0	7.88	13000	0.13
6305	63 heavy	25 × 62 × 17	22.5	11.6	11000	0.23
6405	64 extra heavy	25 × 80 × 21	38.0	23.2	8500	0.53

Basic dynamic load rating Cr at 25 mm bore (kN)

6905 (69 series)

7.02

6005 (60 series)

10.1

6205 (62 series)

14.0

6305 (63 series)

22.5

6405 (64 series)

38.0

Dynamic capacity rises by more than five times from the 69 to the 64 series, while the limiting speed roughly halves. That trade-off drives the selection logic. Choose the 69 or 60 series where space is limited and loads are light. Choose the 62 series as the all-round default. Move to the 63 or 64 series when the calculated life of a 62 series is too short or when shock loads are expected.

60 Series Reference Sizes

The 60 series is widely used in appliance motors, power tools and compact gear units. The table lists commonly requested sizes.

Designation	d (mm)	D (mm)	B (mm)	Cr (kN)	C0r (kN)	Mass (kg)
6001	12	28	8	5.4	2.36	0.022
6002	15	32	9	5.6	2.8	0.030
6003	17	35	10	6.0	3.25	0.039
6004	20	42	12	9.4	5.0	0.069
6006	30	55	13	13.2	8.3	0.12
6007	35	62	14	16.0	10.3	0.16
6008	40	68	15	17.0	11.6	0.19
6010	50	80	16	22.0	16.2	0.26

Load Ratings, L10 Life and What They Mean in Hours

Two load ratings appear on every datasheet for Deep Groove Ball Bearings. The basic dynamic load rating Cr is the constant radial load at which a group of identical bearings reaches a rating life of one million revolutions. The basic static load rating C0r is the load that produces a permanent deformation at the most heavily loaded contact of about 0.0001 times the ball diameter. Dynamic rating governs fatigue life. Static rating governs shock and standstill loading.

L10 = (Cr / P)³ × 10⁶ revolutions

L10h = L10 / (60 × n) hours

Cr = basic dynamic load rating, P = equivalent dynamic load, n = speed in r/min. The exponent 3 applies to ball bearings.

Finding the Equivalent Load P

When only radial force acts, P equals Fr. When axial force is present, compare Fa/Fr with the factor e. If Fa/Fr is not greater than e, then P = Fr. Otherwise P = 0.56 Fr + Y Fa. The factors e and Y depend on the ratio f0·Fa/C0r, where f0 is a calculation factor listed in the product data.

f0·Fa / C0r	e	X (when Fa/Fr > e)	Y (when Fa/Fr > e)
0.172	0.19	0.56	2.30
0.345	0.22	0.56	1.99
0.689	0.26	0.56	1.71
1.03	0.28	0.56	1.55
2.07	0.34	0.56	1.31
3.45	0.38	0.56	1.15
6.89	0.44	0.56	1.00

How Load Changes Life: A 6205 Example

The chart plots calculated L10 hours for a 6205 bearing (Cr = 14.0 kN) running at 1500 r/min. Because life follows a cubic relationship, a small increase in load cuts life sharply. Doubling the equivalent load from 2 kN to 4 kN reduces life by a factor of eight, from about 3,800 hours to about 480 hours. The vertical axis is logarithmic.

6205 calculated life versus equivalent load at 1500 r/min

Lubrication quality adjusts life

The viscosity ratio κ compares actual oil viscosity at operating temperature with the viscosity needed for a full film. Below κ = 1 the surfaces touch, and life drops below the calculated value. Between 1 and 4 a full film forms and life can exceed the basic rating. Clean oil or grease with a high-quality film is therefore worth as much as a larger bearing.

Minimum load requirement

Balls skid instead of rolling when the load is too low, which smears the raceways. A practical guideline is to keep the radial load at or above about 1 percent of C0r. Lightly loaded fan and motor shafts often add a wave spring to provide this.

Axial load limits

For continuous operation, keep axial load below about half of the radial load. Short peaks can be higher, but only if the static safety factor stays above 2 and the bearing is not already operating near its speed limit.

Speed Limits, Friction Torque and Temperature Rise

Speed capability in Deep Groove Ball Bearings depends on size, cage, lubricant and sealing. The speed factor dm·n, which is the pitch diameter in mm multiplied by r/min, is a convenient comparison number. Grease-lubricated steel-cage designs commonly run up to 400,000 to 600,000 mm·r/min. Oil mist, light preload and higher precision grades can raise that figure significantly.

Relative limiting speed by closure type (open bearing = 100%)

Open

100%

Shielded (ZZ)

about 97%

Non-contact seal (2RZ)

about 80%

Contact seal (2RS)

about 50%

Estimating Friction and Heat

The load-dependent friction torque of Deep Groove Ball Bearings can be estimated as M = 0.5 × μ × P × d, where μ is the friction coefficient (about 0.0015 for this bearing type), P is the equivalent load and d is the bore diameter. For a 6205 carrying 1.4 kN, M ≈ 0.5 × 0.0015 × 1400 N × 0.025 m ≈ 0.026 N·m. At 3000 r/min, this represents about 8 W of heat from load-related friction. Seal drag and grease churning add to the total, which is why sealed bearings run warmer than open ones at the same speed.

A stable operating temperature is usually 20 to 40 °C above ambient. Temperature that keeps climbing after the first hour of operation points to over-greasing, insufficient clearance, a seized seal or misalignment.

Internal Clearance and Fits for Deep Groove Ball Bearings

Radial internal clearance is the total distance one ring can move relative to the other in the radial direction before mounting. Interference fits on the inner ring expand the ring and the temperature gradient between the rings reduces clearance further. As a rule, operating clearance shrinks by about 70 to 80 percent of the effective interference at the inner ring seat. A bearing that has comfortable clearance on the bench can therefore run with almost none once mounted.

Bore range (mm)	C2 (µm)	CN (µm)	C3 (µm)	C4 (µm)
10 to 18	0 – 9	3 – 18	11 – 25	18 – 33
24 to 30	0 – 10	5 – 20	13 – 28	23 – 41
30 to 40	1 – 11	6 – 20	15 – 33	28 – 46

Typical radial clearance values for Deep Groove Ball Bearings following ISO 5753 groups. Verify against the drawing for the specific design.

Shaft and Housing Fit Guidelines

Operating condition	Shaft tolerance	Housing tolerance
Rotating inner ring, normal load	k5 or k6 (up to 100 mm)	H7 or J7
Rotating inner ring, light load or small bores	j5 or js5	H7
Rotating inner ring, heavy or shock load	m5 or m6	J7 or K7
Stationary inner ring, load fixed in direction	g6 or h6	H7
Rotating outer ring (wheel hubs, idlers)	g6 or h6	N7 or P7
Floating bearing in a motor end shield	k5 or k6	H7 or G7

Precision Grades and Running Accuracy

Precision grade controls dimensional tolerance and running accuracy. Most Deep Groove Ball Bearings are supplied in P0 (normal) class. Higher classes P6, P5, P4 and P2 tighten bore deviation, radial runout and face runout. The values below apply to the 18 to 30 mm bore range.

Grade	Bore deviation Δdmp (µm)	Inner ring radial runout Kia (µm)	Typical use
P0 (Normal)	0 to -10	13	General machinery, appliances, conveyors
P6	0 to -10	8	Quiet motors, gearboxes, pumps
P5	0 to -8	4	Machine tool auxiliaries, high-speed fans
P4	0 to -6	2.5	Precision spindles, measuring equipment
P2	0 to -2.5	1.5	Ultra-precision instruments

Seals, Shields and Protection Levels

The closure on Deep Groove Ball Bearings determines how long the grease stays in and how long contaminants stay out. The choice affects speed, torque and service life more than most users expect.

Variant	Contact with inner ring	Dust protection	Moisture protection	Friction	Best application
Open	None	None	None	Lowest	Oil-lubricated gearboxes, clean enclosed housings
ZZ shield	No	Good for coarse dust	Poor	Very low	Electric motors, fans in clean environments
2RZ	No (narrow gap)	Very good	Fair	Low	Blowers, medium-speed appliances
2RS	Yes (lip)	Excellent	Good against splash	Moderate to high	Agricultural machinery, conveyors, outdoor equipment

NBR seal material

Oil-resistant, economical, with continuous service from about -30 to +100 °C and short peaks to 120 °C. The standard choice for most sealed Deep Groove Ball Bearings.

FKM seal material

Handles continuous operation up to about 200 °C and resists many chemicals and synthetic lubricants. Chosen for high-temperature motors and aggressive environments.

PTFE-faced seals

Very low friction with strong chemical resistance. Suited to high-speed applications that still need a contact barrier against fine dust.

Lubrication Choices for Deep Groove Ball Bearings

Factory-filled grease is the most common lubricant for Deep Groove Ball Bearings because it keeps the design simple and avoids oil circuits. The right grease depends on temperature, speed and exposure to water or chemicals.

Grease type	Temperature range	Speed suitability	Characteristics
Lithium soap, mineral oil	-30 to +110 °C	Medium to high	General purpose, good water resistance
Lithium complex, mineral oil	-30 to +130 °C	Medium to high	Higher dropping point, suited to continuous duty
Polyurea, synthetic ester or PAO	-40 to +150 °C	High	Low noise, long life in sealed motors
Calcium sulfonate complex	-20 to +140 °C	Low to medium	Excellent water and corrosion protection
PFPE with PTFE thickener	-30 to +250 °C	Medium	Chemically inert, for extreme environments
H1 food-grade white grease	-20 to +120 °C	Medium	Incidental food contact allowed

Filling the free space to 30 to 50 percent is typical. High-speed bearings usually work best with the lower end of that range, since too much grease raises churning losses and temperature. Sealed Deep Groove Ball Bearings are filled for life and should not be re-greased. Open bearings need periodic replenishment. The rule of thumb is that grease life halves for every 15 °C above 70 °C, as the chart shows.

Relative grease life versus operating temperature (70 °C = 100%)

Material and Surface Options

Standard Deep Groove Ball Bearings use high-carbon chromium steel GCr15, equivalent to SAE 52100. For special environments, other materials trade hardness and capacity for corrosion resistance, weight savings or electrical insulation.

Material option	Typical hardness	Corrosion resistance	Key characteristics
GCr15 / SAE 52100	HRC 60 to 64	Low (needs protective grease)	Highest load capacity, standard choice
Stainless steel 440C	HRC 58 to 60	Good	Capacity roughly 20% lower than chrome steel, suited to washdown and humid areas
Hybrid, Si3N4 ceramic balls	Balls above HV 1500	Good in the balls, rings still steel	Ball density 3.2 g/cm³ against 7.8 g/cm³, lower centrifugal force, electrical insulation
Insulated outer ring (Al2O3 coating)	As base steel	Same as base steel	Typically rated to 1000 V DC, protects against current passage

Special Variants of Deep Groove Ball Bearings

Flanged outer ring

A collar on the outer ring locates the bearing against the housing face. It reduces machining and simplifies axial positioning in small gear units and appliances.

Snap ring groove

A groove on the outside surface accepts a retaining ring, removing the need for a housing shoulder and shortening the assembly.

Extended inner ring

The inner ring is wider than the outer ring, giving more shaft contact and room for set screws or locking collars, a layout common in agricultural and conveyor units.

Miniature and thin-section

Bore sizes from 3 mm, used in medical devices, small motors and precision instruments. Light preload and low-torque grease are typical.

High-temperature design

Stabilized rings, heat-resistant cage and special grease allow continuous operation above 200 °C, used near ovens, dryers and kilns.

Low-noise motor series

Selected balls, refined raceway finish and quiet grease reach Z3 vibration grade, intended for household appliance and HVAC motors.

Where Each Specification Works Best

The table gathers typical starting specifications for common machines. Actual selection should be confirmed by load, speed and environment calculations.

Application	Typical series	Closure	Clearance	Cage	Lubricant
Electric motor (0.75 to 7.5 kW)	62, 63	ZZ or 2RS	C3	Steel or PA66	Polyurea, ester oil
Centrifugal pump	62, 63	2RS or open with oil	C3	Steel or brass	Lithium complex
Cooling fan	60, 62	2RZ	CN or C3	PA66	Low-noise ester grease
Gearbox input shaft	62, 63	Open or ZZ	CN or C3	Steel or brass	Gear oil bath
Washing machine drum	62, 63	2RS	CN	Steel	Water-resistant grease
Electric scooter hub	60, 62	2RS	C3	Steel	Lithium soap
Power tools	60, 62	ZZ	C3	Steel or PA66	Polyurea
Conveyor idler rollers	62, 63	2RS	C3	Steel	Calcium sulfonate

How Deep Groove Ball Bearings Are Manufactured and Inspected

Consistency in Deep Groove Ball Bearings comes from process control at every stage. The flow below follows a typical factory route from raw material to export packing.

Stage 1

Steel selection and forging

Vacuum-degassed GCr15 bar is checked for chemistry, carbide network and non-metallic inclusions before ring blanks are forged or cut.

Stage 2

Turning

CNC lathes cut the ring profiles with controlled grinding allowance so that finishing removes a consistent layer.

Stage 3

Heat treatment

Rings are quenched and tempered in controlled-atmosphere furnaces, and hardness and microstructure are sampled every batch.

Stage 4

Grinding and superfinishing

Faces, bore, outer diameter and raceways are ground, then superfinished to reduce waviness and roughness that cause noise.

Stage 5

Assembly

Rings and balls are matched into sets, cages are fitted, grease is dosed by weight and seals are pressed or crimped in place.

Stage 6

Testing and packing

Vibration and torque checks, visual inspection, rust-preventive treatment and export packing complete the line.

Inspection Items

Inspection item	Method	What it protects
Bore, outside diameter, width	Air gauging and coordinate measuring	Correct fit on shaft and in housing
Roundness and waviness of raceways	Roundness tester and profilometer	Low vibration and noise
Hardness	Rockwell hardness tester	Fatigue life and wear resistance
Radial internal clearance	Clearance gauge with measuring load	Temperature rise and running smoothness
Vibration level	Anderon-type vibration tester	Z1, Z2 or Z3 grade confirmation (Z3 is the quietest)
Grease quantity	Weighing before sealing	Consistent torque and life
Starting and running torque	Torque tester	Seal drag and cleanliness
Appearance and rust protection	Visual and sample inspection	Condition on arrival after long transit

Customization Options for Deep Groove Ball Bearings

When a standard part does not meet a specific machine requirement, Deep Groove Ball Bearings can be adapted in several areas without redesigning the whole bearing.

Dimensions

Special bore, outside diameter or width, extended inner rings and modified chamfers to fit existing shafts and housings.

Clearance and precision

Non-standard clearance windows and matched classes such as P6 running accuracy with C3 clearance.

Lubricant and fill

Choice of grease type, fill level and low-noise or low-torque variants, including food-grade and high-temperature options.

Seals and cages

Alternative seal materials and lip designs, plus PA66, brass, PEEK or steel cages.

Marking

Laser marking of designation, batch code, logo or customer part number on the ring face.

Packaging

Individual boxes, tubes, plastic sleeves, bulk cartons, VCI anti-rust wrap and palletized loads suitable for sea or air shipment.

Mounting Deep Groove Ball Bearings Correctly

Most early failures are traced back to mounting rather than manufacturing. These steps address the most frequent mistakes.

Step 1

Inspect the seats

Measure the shaft and housing with a micrometer and bore gauge. Remove burrs and check shoulder squareness before opening the package.

Step 2

Keep the bearing sealed in its wrapping

Do not wash greased bearings. Open the package only at the moment of mounting, and keep the work area clean.

Step 3

Heat when interference is tight

Use an induction heater at 80 to 100 °C. Never exceed 120 °C, and never use an open flame.

Step 4

Press on the correct ring

Apply force to the ring that carries the interference fit. A sleeve contacting the whole ring face prevents force passing through the balls.

Step 5

Verify rotation

Turn the shaft by hand. It should rotate freely without catching, with no gritty feel and no axial play beyond design.

Step 6

Monitor first hours

Track temperature, noise and vibration during the first running period. Temperature should plateau within an hour or two.

Diagnosing Failures in Deep Groove Ball Bearings

Observation	Likely cause	Corrective action
Flaking on the raceway	Overload, contamination dents, or normal fatigue at end of life	Recalculate L10, improve sealing, move to a heavier series
Dull, smeared tracks	Thin lubricant film, low κ	Use a higher viscosity base oil and shorten the regreasing interval
Skid marks on balls	Load below minimum or sudden acceleration	Add spring preload, use lower-viscosity grease
Blue or brown discoloration	Overheating from tight fit or over-greasing	Select C3 clearance, reduce grease fill, check shaft and housing fits
Washboard pattern on raceways	Shaft currents from variable-frequency drives	Insulated bearings, shaft grounding
Cracked inner ring	Excessive interference or ring creep	Check shaft tolerance and avoid overheating during mounting
Cage damage	Vibration, misalignment or overspeed	Brass or PA66 cage, improve alignment
Rust spots	Moisture entering during idle periods	Contact seals, corrosion-protective grease, stainless option

Specification Checklist for Deep Groove Ball Bearings

Gathering the following details at the start shortens the selection process and avoids repeated revisions.

Loads

Radial and axial forces, direction, peak and continuous values, and whether shock is present.

Speed

Normal and maximum r/min, and whether the machine starts and stops frequently.

Temperature

Ambient range, expected housing temperature and any nearby heat sources.

Environment

Dust, water, chemical vapour, washdown or vacuum conditions.

Shaft and housing

Materials, tolerances, shoulder dimensions and axial space.

Noise target

Required vibration or sound level, and any preload spring in the design.

Life target

Required hours, duty cycle and acceptable maintenance interval.

Electrical conditions

Presence of inverter drive, shaft voltage or need for insulated bearings.

Frequently Asked Questions About Deep Groove Ball Bearings

What is the difference between ZZ and 2RS Deep Groove Ball Bearings?

ZZ means a metal shield that does not touch the inner ring, so friction is minimal and speed capability remains high. 2RS means contact rubber seals, which block fine dust and moisture more effectively but increase friction and lower the speed limit. ZZ suits clean, fast applications, while 2RS suits dirty or wet environments.

How much axial load can Deep Groove Ball Bearings carry?

They accept axial load in both directions, but their strength is radial load. For continuous service, keep axial load below roughly half of the radial load. Where axial load dominates, angular contact ball bearings are the better choice.

Which clearance should be selected for an electric motor?

C3 is the usual choice. Interference fit on the shaft and heat generated during running both reduce clearance, and C3 leaves enough room so that the operating clearance does not become negative.

How do I check that a replacement bearing is truly equivalent?

Match bore, outside diameter and width first, then confirm closure type, clearance class, cage material, precision grade and grease type. Two parts with the same base number can behave very differently if these suffixes differ.

Why do new bearings sometimes sound noisy after installation?

Common reasons are a misaligned housing, a bent shaft, hammering during mounting, dirt on the seat or excessive preload. Grease distribution noise during the first minutes of running is normal and usually fades quickly.

Can sealed Deep Groove Ball Bearings be cleaned or re-greased?

No. Sealed units are filled for life. Washing removes the factory grease and introduces contamination. When the grease is exhausted, the bearing should be replaced.

Can Deep Groove Ball Bearings run on a vertical shaft?

Yes. Retain the lubricant with seals and place a light spring preload on the lower or upper bearing to keep the balls under load and prevent skidding.

How do I protect bearings in an inverter-driven motor?

Use an insulated outer ring or ceramic-ball hybrid bearing on the non-drive end, and fit a shaft grounding ring on the drive end. This stops current passing through the rolling contact and prevents fluting.

What separates P0 from P6 Deep Groove Ball Bearings?

P6 has tighter running accuracy. For a 25 mm bore, inner ring radial runout is limited to 8 µm instead of 13 µm. The result is smoother operation and slightly higher usable speed, which matters in quiet gearboxes and precision motors.

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What Are Deep Groove Ball Bearings and How Do You Choose the Right Type