Ball Bearing Engineering Guide
A deep groove ball bearing is a single row rolling element bearing whose inner and outer raceways form a continuous groove deep enough to hold the ball centered under both radial and moderate axial load. It is the most widely produced bearing ball bearing type in the world, used anywhere a shaft needs to spin smoothly, quietly, and at low friction.
SINGLE ROW / 8-BALL LAYOUT
Definition
What Is a Deep Groove Ball Bearing, Exactly
A deep groove ball bearing is a rolling element bearing built from an inner ring, an outer ring, a set of steel balls, and a cage, where the raceway grooves on both rings are machined slightly larger than the ball radius so the ball sits in a deep, close-fitting channel. That geometry is what lets a deep groove ball bearing carry radial load, axial load in both directions, and high rotational speed inside one compact part.
The name comes directly from the shape of the raceway. In a plain radial bearing the groove is shallow and only resists load pushing straight through the shaft. In a deep groove ball bearing the groove radius is cut only marginally larger than the ball itself, usually within a few percent, so the ball never has room to climb out of the channel even when the shaft pushes sideways. That single geometric decision is why deep groove ball bearings became the default choice across almost every machine category, from a kitchen blender motor to a conveyor gearbox.
When people search for a bearing ball or a bearing ball bearing without knowing the technical name, they are almost always describing this exact part. It is the bearing most engineers picture first because it appears in more catalog pages, more OEM drawings, and more replacement parts lists than any other rolling bearing family.
Why the groove depth matters
A deeper groove increases the contact arc between ball and raceway. More contact arc spreads the load over a larger area, which raises both the radial and axial load rating without increasing the outer dimensions of the bearing.
Why it runs so fast
Because the balls roll rather than slide, and because the design needs no separate thrust component, friction stays low. That low friction is the main reason deep groove ball bearings tolerate the highest speed factors of any common bearing type.
Anatomy
The Parts Inside a Deep Groove Ball Bearing
Every deep groove ball bearing, no matter how small or large, is built from the same five functional parts. Understanding each one makes it much easier to read a bearing size chart or a bearing dimensions chart later, because every dimension on that chart maps to one of these components.
01
Inner ringPresses onto the shaft and carries the inner raceway groove. Its bore diameter is the first number in any bearing size chart.
02
Outer ringSits in the housing bore and carries the outer raceway groove. Its outside diameter, together with the bore, defines the cross section of the bearing.
03
Ball complementA ring of hardened steel balls, usually eight to ten in a small or medium bore, that rolls between the two raceways and physically carries the load.
04
Cage or retainerKeeps the balls evenly spaced around the raceway so they do not touch each other, which would create sliding friction and rapid wear.
05
Seal or shieldAn optional cover pressed or fixed onto the outer ring that keeps lubricant in and dirt out. Open, shielded, and sealed versions all share the same internal geometry.
Note: the term ball bearing is often used loosely to describe the whole assembly, while bearing ball on its own usually refers only to the loose steel ball component sold separately for repair or regreasing work.
Working Principle
How a Deep Groove Ball Bearing Carries Load
A deep groove ball bearing works on a point contact principle. Each steel ball touches the inner raceway at one point and the outer raceway at one point, and load passes through those two tiny contact patches instead of across a full line, the way it would in a roller bearing. Point contact keeps rolling resistance low, which is why deep groove ball bearings spin more freely than almost any other bearing family of the same size.
Because the raceway groove is deep on both rings, the line connecting the two contact points is not perfectly straight through the center of the ball, it sits at a small angle, often quoted as roughly zero degrees at rest but shifting slightly under axial load. That shifting contact angle is what allows a single row deep groove ball bearing to resist thrust from either direction without needing a second, opposing bearing. A tapered roller bearing or an angular contact bearing needs to be paired to handle two way thrust. A deep groove single row ball bearing does it alone, in one part, at one price.
Radial capacity
Radial load pushes straight down through the shaft into the housing. The full circle of balls shares this load, with the balls directly under the load line carrying the largest share.
Axial capacity
Axial load pushes along the shaft centerline. The deep groove lets the contact points shift slightly so a portion of every ball still resists the thrust, in either direction.
Configurations
Single Row Deep Groove Ball Bearing vs Double Row
Most of what people mean by a deep groove ball bearing is the single row deep groove ball bearing, which is by far the more common configuration. A double row version doubles the ball complement in one wider bearing, which raises radial capacity without stacking two separate single row bearings on the shaft. The table below lines up the two configurations side by side.
Feature
Single row deep groove ball bearing
Double row deep groove ball bearing
Ball rows
1
2
Typical width
Narrow, standard series
Roughly 1.3 to 1.6x the width of a single row equivalent
Radial capacity
Baseline
Roughly 1.5 to 1.8x higher
Axial capacity
Moderate, both directions
Higher, both directions
Cost per unit
Lower
Higher
Common use
Electric motors, pumps, gearboxes, appliances
Heavy pulleys, high radial load fans, textile machinery
In practice, deep groove single row ball bearings cover more than nine out of ten industrial applications, because most shafts do not need the extra radial margin a double row design provides. Double row bearings are reserved for situations where space along the shaft is limited but the radial load is unusually high.
Advantages
Why Deep Groove Ball Bearings Are the Default Choice
Ask any bearing engineer what are deep groove ball bearings good for and the answer is almost always the same: everything that is not an extreme case. They are not the highest load bearing available, and they are not the fastest bearing available, but they are the best all around compromise between load, speed, cost, and simplicity, which is exactly why global production volume for this single bearing type outpaces every other rolling bearing family combined.
Low friction, low heat generation High limiting speed Two way axial capacity in one part Simple, low cost manufacturing Wide size and tolerance availability Low maintenance under normal duty Quiet running at speed Easy interchange between brands
Relative operating speed by bearing type
Illustrative limiting speed factor, same bore size, grease lubrication, indexed to 100 for the deep groove ball bearing
Deep groove Angular contact Cylindrical roller Tapered roller 100 85 70 50
Sealing and Shielding
Open, Shielded and Sealed Deep Groove Ball Bearings
A deep groove ball bearing can be supplied with several different protection levels, and the suffix letters after the size number tell you which one you are holding. This matters as much as the raw dimensions when you are matching a replacement bearing ball bearing to a machine.
Suffix
Protection type
Best suited for
Open
No shield or seal, packed with grease by the user or oil bath lubricated
Clean, controlled environments with a dedicated lubrication system
ZZ / 2Z
Metal shields on both sides, non contact
Light dust protection, higher speed than sealed types
RS / 2RS
Rubber seals on both sides, light contact
General industrial and appliance use, keeps grease sealed for life
RZ / 2RZ
Rubber seals, low friction non contact design
Higher speed applications that still need seal level protection
Sizing
Deep Groove Ball Bearing Size Chart and Dimensions
Every deep groove ball bearing is described by three core measurements: bore diameter, outside diameter, and width. Together these three numbers make up the bearing dimensions chart that appears on every manufacturer datasheet. The table below is a standard ball bearing size chart for the most common metric series, covering the 60 extra light, 62 light, and 63 medium series.
Bearing number
Bore (mm)
Outside dia (mm)
Width (mm)
Dynamic load (kN)
Limiting speed (grease, rpm)
6000
10
26
8
4.6
28000
6001
12
28
8
5.1
26000
6002
15
32
9
5.6
24000
6003
17
35
10
6.0
22000
6004
20
42
12
9.4
19000
6200
10
30
9
5.1
26000
6201
12
32
10
6.8
24000
6202
15
35
11
7.6
22000
6203
17
40
12
9.6
20000
6204
20
47
14
12.7
18000
6205
25
52
15
14.0
16000
6300
10
35
11
7.6
22000
6301
12
37
12
9.7
20000
6302
15
42
13
11.4
19000
6303
17
47
14
13.5
17000
6304
20
52
15
15.9
15000
Figures above are representative catalog level values used for general comparison. Always confirm exact bearing sizes and bearing dimensions against the current manufacturer datasheet before ordering, since load ratings vary slightly between production standards.
Outside diameter growth by series, 20 mm bore
Comparing how outside diameter changes across the 60, 62 and 63 series at the same bore size, from the bearing size chart above
6004 series 6204 series 6304 series 42mm 47mm 52mm
How to read a bearing designation
A code such as 6205-2RS-C3 packs bearing sizes and options into one string. Breaking it apart makes the whole bearing dimensions chart easier to use going forward.
Code segment
Meaning
62
Series and type, here a light series deep groove ball bearing
05
Bore code, multiply by 5 to get bore in mm, so 05 equals 25mm
2RS
Rubber seals fitted on both sides
C3
Internal clearance class, C3 is looser than the standard clearance
Materials
Materials Used to Build a Deep Groove Ball Bearing
The rings and balls in a standard deep groove ball bearing are made from chrome alloy bearing steel, most commonly grade GCr15, which is through hardened to roughly 60 to 64 HRC. That hardness lets the small ball to raceway contact patch handle repeated stress cycles without deforming. Cages are typically stamped steel for smaller bore bearings and machined brass or engineered polymer for larger or higher speed bearings.
Chrome steel, GCr15
The standard material for the vast majority of deep groove ball bearings. Good hardness, good fatigue life, and low cost make it the default across industrial and consumer equipment.
Stainless steel, 440C
Used where moisture or mild corrosive exposure is a concern, such as food processing lines, marine equipment, and outdoor machinery.
Ceramic hybrid
Silicon nitride balls paired with steel rings reduce weight and friction further, used in high speed spindles and specialized electric motor designs.
Engineered plastic cage
Reduces cage mass and friction at high speed, common in electric motor bearings that must run quietly for long service intervals.
Applications
What Are Deep Groove Ball Bearings Used For
The honest answer to what are deep groove ball bearings used for is almost anything that spins. Because the design handles radial load, moderate thrust in both directions, and high speed all in one compact and inexpensive part, it became the go to rotating support across nearly every industry that builds machinery.
Industry
Typical location
Why deep groove ball bearings fit
Electric motors
Drive end and non drive end shaft support
High speed, low noise, low friction heat
Automotive
Alternators, water pumps, gearbox shafts, wheel hub subassemblies
Compact size, reliable under vibration
Home appliances
Washing machine drums, fans, blenders, vacuum motors
Low cost, quiet running, long grease life
Agricultural machinery
Gearboxes, pump shafts, conveyor rollers
Tolerant of dust with sealed variants
Industrial fans and pumps
Impeller shaft support
High limiting speed, good axial capacity
Conveyor systems
Roller and pulley shafts
Simple mounting, wide size range
Power tools
Motor shaft and gear stage support
Small envelope, high speed capability
Textile machinery
Spindles and roller shafts
Precision running, low vibration
Share of global deep groove ball bearing demand by end use
Illustrative distribution used for general orientation, actual figures vary by region and year
Electric motors Automotive Appliances Industrial equipment Other 28% 24% 19% 15% 14%
Selection
How to Select the Right Deep Groove Ball Bearing
Confirm the shaft and housing dimensions
Measure the shaft diameter for bore size and the housing bore for outside diameter, then cross reference against a bearing sizes chart to shortlist candidate part numbers.
Calculate radial and axial load
Add up the actual forces the bearing will see in operation, including any belt tension or gear mesh force, not just the static weight of the rotating assembly.
Check the required speed
Compare your operating rpm against the limiting speed column of the ball bearing dimensions chart, then apply a safety margin for grease life and ambient temperature.
Choose a sealing type
Pick open bearings only if you have a controlled lubrication system, otherwise choose 2RS or ZZ based on the dust, moisture, and speed profile of the environment.
Select the clearance class
Standard clearance suits most general purpose work, while C3 clearance is common for electric motors that run hot and need extra internal room.
Confirm the tolerance grade
ABEC or ISO P0 tolerance is fine for general machinery, while precision spindles and high speed equipment need P6 or tighter.
Installation and Maintenance
Installing and Maintaining a Deep Groove Ball Bearing
Mounting pressure
Always press against the ring being fitted, the inner ring when mounting onto a shaft and the outer ring when pressing into a housing, so force never passes through the balls.
Heat assisted fitting
For an interference fit, heating the bearing to roughly 80 to 100 degrees Celsius lets it slide onto the shaft without force, then it shrinks into place as it cools.
Lubrication interval
Sealed bearings are typically greased for life, while open and shielded bearings on continuous duty equipment usually need regreasing every three to twelve months depending on speed and temperature.
Alignment check
Shaft and housing must stay concentric within the bearing manufacturer tolerance, since misalignment concentrates load on a narrow band of the raceway and shortens fatigue life sharply.
Common failure modes
Symptom
Likely cause
Prevention
Grinding or roughness
Contamination inside the raceway
Switch to a sealed variant, improve housing sealing
Overheating
Over greasing or too tight a fit
Follow fill quantity guidance, verify fit tolerance
Flaking or spalling
Fatigue from sustained overload
Recheck load calculation, upgrade to a higher capacity series
Rust marks on raceway
Moisture ingress or storage humidity
Use sealed bearings, store in original packaging
Loose fit, shaft slip
Undersized shaft or worn housing bore
Confirm tolerance against ISO fit tables before mounting
Sourcing
Where to Source Deep Groove Ball Bearings
Consistent dimensions, verified steel grade, and stable heat treatment matter just as much as the numbers printed on a bearing dimensions chart. A supplier that runs its own forging, turning, heat treatment, and grinding lines can hold tolerance and load rating far more consistently than a trading company that only repackages bearings from mixed sources.
Ningbo Zhenhai Hualei Bearing Co., Ltd.
Ningbo Zhenhai Hualei Bearing Co., Ltd. manufactures deep groove ball bearings across the 60, 62, and 63 series, along with open, ZZ, and 2RS sealing variants, sized from small instrument bore bearings up to medium industrial bore bearings. The company is a practical option for buyers who need dependable bearing sizes, stable supply volume, and support matching a bearing ball bearing to an existing drawing or replacing an obsolete part number.
60 / 62 / 63Series coverage across standard metric bearing sizes
Open / ZZ / 2RSSealing options available across most part numbers
GCr15Chrome bearing steel used for rings and balls
OEM supportAssistance matching part numbers to existing drawings
Frequently Asked Questions
Deep Groove Ball Bearing FAQ
What is a deep groove ball bearing used for in everyday equipment
It supports a rotating shaft against radial load and moderate side to side thrust at the same time, which is why it shows up in motors, pumps, fans, and appliance drums rather than in equipment built only for pure thrust or extremely heavy radial load.
What are deep groove ball bearings used for compared with roller bearings
Deep groove ball bearings favor speed and low friction, while roller bearings favor higher radial capacity at lower speed. Most general machinery uses deep groove ball bearings unless the load is unusually heavy for the available shaft size.
How do I read bearing sizes from a part number
The last two digits of most standard part numbers give the bore in millimeters when multiplied by five, and the series digits in front indicate the outside diameter and width family, both of which are listed on a standard bearing size chart.
Can a single row deep groove ball bearing replace a double row bearing
Only if the radial load is within the single row rating. A single row deep groove ball bearing has lower radial capacity than a double row unit in the same outside diameter, so the load calculation should always be rechecked before substituting.
What is the difference between a bearing ball and a ball bearing
A bearing ball is the individual steel sphere, sold loose for repair or regreasing work. A ball bearing is the complete assembly, rings, balls, and cage together, ready to mount on a shaft.
How long does a deep groove ball bearing last
Service life depends on load, speed, lubrication, and alignment, but a correctly selected and properly mounted deep groove ball bearing under normal industrial duty commonly runs for several years before the raceway shows fatigue.
Summary
The Short Version
A deep groove ball bearing is the everyday workhorse of rotating machinery. Its deep raceway groove lets one compact, affordable part carry radial load, axial load in both directions, and high rotational speed at the same time, which is why it appears in more designs than any other bearing type. Whether you are reading a ball bearing size chart to match a replacement part, comparing single row and double row options, or sourcing volume production from a manufacturer such as Ningbo Zhenhai Hualei Bearing Co., Ltd., the same underlying principle holds true, the groove depth is the feature, and everything else about the bearing follows from it.
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