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Mechanical engineering · rolling bearings

Ball Bearing Size Chart

Look up common metric deep-groove ball bearing dimensions by number, or enter measured bore, outside diameter, and width to find the closest listed size.

Scope
60 · 62 · 63 · 68 · 69 series
Dimensions
d × D × B
Default
6204 · 20 × 47 × 14 mm

Reverse size lookup

Find a Ball Bearing by Size or Number

Search an exact base designation or enter one to three measured dimensions. More measurements produce a more meaningful match.

Default example: 6204 = 20 × 47 × 14 mm. A dimensional match is a candidate size—not proof that two bearings are interchangeable.

Dimension reference

Ball Bearing d, D, and B Dimensions

The selected bearing updates this diagram. Geometry is diagrammatic and not a manufacturing drawing or full-size template.

6204 deep-groove ball bearing dimensions Diagram showing bore diameter d of 20 millimeters, outside diameter D of 47 millimeters, and bearing width B of 14 millimeters. D = 47 mm d = 20 mm B = 14 mm Side view
Boundary dimensions: d is bore diameter, D is outside diameter, and B is bearing width.
Selected bearing
6204
Bore diameter, d
20 mm
Outside diameter, D
47 mm
Width, B
14 mm
Series
62

Common metric reference

Common Metric Ball Bearing Sizes

A deliberately bounded reference for common single-row deep-groove base designations. Sort or filter without leaving the page.

Search a bearing number or dimension string such as “6204” or “20 47 14”. Use View to send a row to the result and diagram.

Scroll horizontally to view additional columns and vertically to view additional rows. Column headers remain visible while scrolling.

Nominal boundary dimensions for the limited common-series reference used on this page. Canonical values are stored in millimeters.
Boundary dimensions Size d × D × B Actions
6000 60 00 10 mm 26 mm 8 mm 10 × 26 × 8 mm
6001 60 01 12 mm 28 mm 8 mm 12 × 28 × 8 mm
6002 60 02 15 mm 32 mm 9 mm 15 × 32 × 9 mm
6003 60 03 17 mm 35 mm 10 mm 17 × 35 × 10 mm
6004 60 04 20 mm 42 mm 12 mm 20 × 42 × 12 mm
6005 60 05 25 mm 47 mm 12 mm 25 × 47 × 12 mm
6006 60 06 30 mm 55 mm 13 mm 30 × 55 × 13 mm
6200 62 00 10 mm 30 mm 9 mm 10 × 30 × 9 mm
6201 62 01 12 mm 32 mm 10 mm 12 × 32 × 10 mm
6202 62 02 15 mm 35 mm 11 mm 15 × 35 × 11 mm
6203 62 03 17 mm 40 mm 12 mm 17 × 40 × 12 mm
6204 62 04 20 mm 47 mm 14 mm 20 × 47 × 14 mm
6205 62 05 25 mm 52 mm 15 mm 25 × 52 × 15 mm
6206 62 06 30 mm 62 mm 16 mm 30 × 62 × 16 mm
6300 63 00 10 mm 35 mm 11 mm 10 × 35 × 11 mm
6301 63 01 12 mm 37 mm 12 mm 12 × 37 × 12 mm
6302 63 02 15 mm 42 mm 13 mm 15 × 42 × 13 mm
6303 63 03 17 mm 47 mm 14 mm 17 × 47 × 14 mm
6304 63 04 20 mm 52 mm 15 mm 20 × 52 × 15 mm
6305 63 05 25 mm 62 mm 17 mm 25 × 62 × 17 mm
6306 63 06 30 mm 72 mm 19 mm 30 × 72 × 19 mm
6800 68 00 10 mm 19 mm 5 mm 10 × 19 × 5 mm
6801 68 01 12 mm 21 mm 5 mm 12 × 21 × 5 mm
6802 68 02 15 mm 24 mm 5 mm 15 × 24 × 5 mm
6803 68 03 17 mm 26 mm 5 mm 17 × 26 × 5 mm
6804 68 04 20 mm 32 mm 7 mm 20 × 32 × 7 mm
6805 68 05 25 mm 37 mm 7 mm 25 × 37 × 7 mm
6806 68 06 30 mm 42 mm 7 mm 30 × 42 × 7 mm
6900 69 00 10 mm 22 mm 6 mm 10 × 22 × 6 mm
6901 69 01 12 mm 24 mm 6 mm 12 × 24 × 6 mm
6902 69 02 15 mm 28 mm 7 mm 15 × 28 × 7 mm
6903 69 03 17 mm 30 mm 7 mm 17 × 30 × 7 mm
6904 69 04 20 mm 37 mm 9 mm 20 × 37 × 9 mm
6905 69 05 25 mm 42 mm 9 mm 25 × 42 × 9 mm
6906 69 06 30 mm 47 mm 9 mm 30 × 47 × 9 mm

Nominal boundary dimensions only. Verify the exact manufacturer designation, bearing type, suffix, internal clearance, seals or shields, precision/tolerance class, ratings, fits, lubrication, and service conditions before specification or replacement.

More filters and actions

How to Read Ball Bearing Dimensions

Ball bearing boundary dimensions are normally written d × D × B. Lowercase d is the bore diameter that fits over the shaft, uppercase D is the outside diameter that fits in the housing, and B is the axial width of the bearing.

d — bore diameter
The inside diameter through the inner ring.
D — outside diameter
The largest outside diameter of the outer ring.
B — width
The bearing’s axial boundary width.

Example: 6204

6204 = 20 × 47 × 14 mm: 20 mm bore, 47 mm outside diameter, and 14 mm width. Those dimensions identify the base size; they do not by themselves establish seals, clearance, tolerance class, load capacity, or application suitability.

How Ball Bearing Numbers Relate to Bore Size

For common standardized bearing designations, the final two-digit bore code gives useful information about the nominal bore. The special codes 00, 01, 02, and 03 correspond to 10, 12, 15, and 17 mm. From code 04 upward in the applicable common range, multiplying the code by 5 gives the nominal bore in millimeters.

Bore codeNominal boreExample designation
0010 mm6200
0112 mm6201
0215 mm6202
0317 mm6203
0420 mm6204
0630 mm6206

Do not use this shortcut to decode manufacturer suffixes, seals, shields, precision classes, internal clearances, snap-ring variants, or special/nonstandard bore designs.

6000 vs 6200 vs 6300 vs 6800 vs 6900 Series

The same bore diameter can appear in several dimensional series. That is why measuring only the shaft/bore is not enough to identify a replacement bearing.

BearingSeriesd × D × BWhat changes
68006810 × 19 × 5 mmVery compact boundary envelope
69006910 × 22 × 6 mmLarger OD and width than 6800
60006010 × 26 × 8 mmLarger envelope again
62006210 × 30 × 9 mmStill larger OD and width
63006310 × 35 × 11 mmLargest envelope in this comparison

This dimensional comparison should not be converted into a blanket load-capacity ranking. Actual ratings, speed limits, cage, clearance, lubrication, and suffix details must be checked for the exact bearing.

How to Measure a Ball Bearing for Replacement

  1. Read the designation first. Clean the ring and look for an etched or stamped base number and suffixes.
  2. Measure the bore. Use calipers or a micrometer across clean, undamaged inner-ring surfaces.
  3. Measure the outside diameter. Measure across the outer ring at more than one orientation if wear or damage is suspected.
  4. Measure the width. Measure the axial distance across the bearing faces without including removable external hardware.
  5. Compare all three dimensions. Enter d, D, and B above; using all three reduces ambiguous matches.

Field measurements help identify a candidate size. They are not a substitute for the manufacturer’s dimensional tolerances or a calibrated inspection process.

Why Matching Size Does Not Prove Interchangeability

Replacement warning

A bearing that fits the same shaft and housing can still be wrong for the machine. Confirm the complete designation and application requirements before replacement.

Bearing type

Deep-groove, angular-contact, self-aligning, roller, and thrust bearings can use very different internal geometries.

Suffixes and clearance

Seals, shields, snap-ring features, internal clearance, precision, and other suffix meanings are manufacturer-specific.

Performance

Dynamic/static load ratings, limiting speeds, lubrication, temperature capability, and life must suit the application.

Fits and mounting

Shaft and housing fits, shoulders, fillets, preload/endplay, and mounting method remain part of the engineering design.

Standards, Dataset Scope, and Source Method

Dataset T2E-BB-DIM-1 · 35 common metric single-row deep-groove base sizes · 60/62/63/68/69 series · 10, 12, 15, 17, 20, 25, and 30 mm bores · canonical units: millimeters.

ISO 15:2017 provides the standardization context for radial-bearing boundary dimensions. Turn2Engineering does not reproduce the ISO standard or a complete manufacturer catalog. The table above is a bounded, reorganized dimensional reference checked against current official manufacturer material; manufacturer performance fields are intentionally excluded.

Dataset and Source-Check Details

Publisher
Turn2Engineering
Source checked
August 16, 2026
Standard context
ISO 15:2017
Included fields
Base designation, series, bore code, d, D, B
Canonical units
Millimeters; inch values are calculated as mm ÷ 25.4
Excluded fields
Loads, speeds, mass, cage, lubrication, clearances, suffix catalogs
Rights decision
Limited transformed reference; no full catalog/standard reproduction
Download decision
Full CSV disabled pending separate rights review

Ball Bearing Size Chart FAQ

They are normally written d × D × B: bore diameter, outside diameter, and bearing width.

The base 6204 reference used here is 20 mm bore × 47 mm outside diameter × 14 mm width; verify the complete suffix and application requirements before replacement.

Yes; different dimensional series can share the same bore while using different outside diameters and widths.

Common seal or shield variants often retain the same basic d, D, and B envelope, but suffix meanings and product details are manufacturer-specific and must be checked in the exact catalog.

Dimensions can narrow the candidate designation, but final replacement also requires matching bearing type, suffix/specification, clearance, ratings, fits, speed, lubrication, and service conditions.

Identify the Size, Then Verify the Bearing

Use the chart and reverse lookup to identify a likely base size from the bearing number or measured d × D × B dimensions. Then verify the full designation and application requirements with the exact manufacturer’s current product data before purchasing or specifying the bearing.

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