Deep groove ball bearings
8,711 dimension rows · 8,711 model records · FAG, KOYO, NACHI, NSK, NTN, SKF
Find · understand · compare
Bearing dimension chart: sizes, brands & variants
This is a database-backed index, not a guessed standard-size list. Each model chart shows recorded dimensions and opens the actual products behind them.
On this page9 sections ⌄
What does your bearing size refer to?
A search such as 8 mm bearing or 1 inch ball bearing is not a complete part specification. Choose the measured feature below: a shaft opening, an outside ring, an axial dimension or a loose sphere. The same number can lead to different results.
Results update immediately when a valid input changes. Changing the unit reinterprets the entered number: 1 inch means 25.4 mm. Unknown dimensions stay unknown. No bearing is selected until you choose the measured feature.
Enter a measurement and select its meaning to see a supported lookup.
Record a loose-ball specification, not a bearing bore
mm is the requested sphere diameter. Also retain material, ball grade, gauge or diameter deviation, lot requirements and quantity. A grade is not a nominal size or an assembled-bearing ABEC class.
This tool does not list a loose ball as an available product, infer the ball count inside a bearing, or approve replacing rolling elements. A nearby metric or inch size is not automatically interchangeable.
Match the other dimensions, the complete suffix and the drawing before comparison. Width labels B and assembly height T are retained separately. Nominal size alone does not approve a fit or replacement.
| Brand / model | Original construction | Bore d | Outside D | Axial dimension | Closure |
|---|
No record matches these conditions in this reviewed snapshot. Remove a condition or inspect the broader catalogue. No nearby size is substituted.
Open broader catalogue search for this measurement → The broader catalogue can contain components outside this verified complete-bearing snapshot.
Common measurements from the keyword library
These are requested measurements, not a claim that every size is manufactured. Counts below belong to the 29,253-record reviewed snapshot, across its ball and roller bearing structures. Choose the measured feature after opening a size.
0.5 mmBore: 0 · Outside: 0 · Axial: 01 mmBore: 11 · Outside: 0 · Axial: 51.5 mmBore: 20 · Outside: 0 · Axial: 72 mmBore: 43 · Outside: 0 · Axial: 332.5 mmBore: 25 · Outside: 0 · Axial: 903 mmBore: 65 · Outside: 7 · Axial: 673.5 mmBore: 0 · Outside: 0 · Axial: 294 mmBore: 93 · Outside: 16 · Axial: 1534.5 mmBore: 0 · Outside: 0 · Axial: 04.75 mmBore: 0 · Outside: 0 · Axial: 05 mmBore: 109 · Outside: 21 · Axial: 3065.5 mmBore: 0 · Outside: 0 · Axial: 06 mmBore: 121 · Outside: 36 · Axial: 2996.3 mmBore: 0 · Outside: 0 · Axial: 06.35 mmBore: 11 · Outside: 4 · Axial: 67 mmBore: 113 · Outside: 39 · Axial: 5297.5 mmBore: 0 · Outside: 0 · Axial: 08 mmBore: 141 · Outside: 43 · Axial: 3188.5 mmBore: 0 · Outside: 0 · Axial: 09 mmBore: 105 · Outside: 29 · Axial: 5439.5 mmBore: 0 · Outside: 0 · Axial: 010 mmBore: 440 · Outside: 37 · Axial: 49611 mmBore: 0 · Outside: 39 · Axial: 22612 mmBore: 550 · Outside: 30 · Axial: 86812.5 mmBore: 0 · Outside: 0 · Axial: 012.7 mmBore: 1 · Outside: 9 · Axial: 2513 mmBore: 0 · Outside: 63 · Axial: 60914 mmBore: 0 · Outside: 34 · Axial: 55415 mmBore: 593 · Outside: 24 · Axial: 52416 mmBore: 0 · Outside: 63 · Axial: 92917 mmBore: 661 · Outside: 60 · Axial: 43918 mmBore: 0 · Outside: 5 · Axial: 1,05619 mmBore: 0 · Outside: 154 · Axial: 48320 mmBore: 840 · Outside: 16 · Axial: 89221 mmBore: 0 · Outside: 46 · Axial: 46122 mmBore: 45 · Outside: 173 · Axial: 60624 mmBore: 0 · Outside: 170 · Axial: 76625 mmBore: 975 · Outside: 0 · Axial: 5661 in / 25.4 mmBore: 12 · Outside: 0 · Axial: 6326 mmBore: 0 · Outside: 192 · Axial: 31229 mmBore: 2 · Outside: 2 · Axial: 23130 mmBore: 1,031 · Outside: 229 · Axial: 2461.25 inBore: 14 · Outside: 0 · Axial: 732 mmBore: 44 · Outside: 381 · Axial: 2071.5 inBore: 22 · Outside: 0 · Axial: 3340 mmBore: 1,089 · Outside: 256 · Axial: 42041 mmBore: 0 · Outside: 2 · Axial: 15545 mmBore: 1,056 · Outside: 8 · Axial: 28850 mmBore: 1,109 · Outside: 23 · Axial: 2112 inBore: 27 · Outside: 0 · Axial: 662 mmBore: 0 · Outside: 914 · Axial: 1042.5 inBore: 21 · Outside: 1 · Axial: 423 inBore: 25 · Outside: 14 · Axial: 080 mmBore: 884 · Outside: 966 · Axial: 340100 mmBore: 843 · Outside: 1,053 · Axial: 1344 inBore: 13 · Outside: 8 · Axial: 1120 mmBore: 724 · Outside: 747 · Axial: 955 inBore: 9 · Outside: 15 · Axial: 76 inBore: 8 · Outside: 16 · Axial: 08 inBore: 7 · Outside: 0 · Axial: 010 inBore: 3 · Outside: 7 · Axial: 112 inBore: 3 · Outside: 2 · Axial: 025 inBore: 0 · Outside: 0 · Axial: 0
Before calling a size a match
- For a complete bearing, keep all measured dimensions and the complete marking. One size produces candidates, not a replacement approval.
- A loose ball has one diameter. Do not treat a steel-ball diameter as a shaft opening or infer internal ball dimensions from d×D×B.
- Enter fractions explicitly. “1 2 inch” could be a lost fraction or two numbers; the tool will not silently convert it to 1/2 or 12.
- This snapshot excludes separate cups/cones, housings, matched sets and needle roller sets without an inner ring. Use the appropriate component drawing for those parts.
Technical basis: JTEKT boundary-dimension definitions; NIST exact inch-to-millimetre relationship; the existing precision-ball specification guide. Product values retain the reviewed manufacturer-property snapshot dated 2026-10-02. This page is a research aid, not stock availability, a toleranced drawing or installation approval.
Look up real bearing dimensions
Choose a bearing structure, then enter the dimensions you know. You can leave unknown dimensions blank. The chart contains 29,253 catalogue records whose bore, outside diameter and width or height symbols have been checked against retained manufacturer properties. It is not a complete ISO standard or an interchange list.
Changing units converts entered values; it does not reinterpret 12.7 mm as 12.7 inches. Inch fractions such as 1/2 are accepted. A blank field means unknown, not zero.
Showing the first 24 of 8,711 Deep groove ball bearings records. Filters apply immediately.
| Brand / complete designation | Original construction | Bore d | Outside D | Width / height | Recorded closure |
|---|---|---|---|---|---|
| KOYO681 | Deep groove ball bearing | 1 mm | 3 mm | 1 mm (B) | Open |
| NSK681 | Deep groove ball bearing | 1 mm | 3 mm | 1 mm (B) | Open |
| KOYOF681 | Deep groove ball bearing | 1 mm | 3 mm | 1 mm (B) | Open |
| NSKF681 | Deep groove ball bearing | 1 mm | 3 mm | 1 mm (B) | Open |
| SKFW 618/1 | Stainless steel deep groove ball bearing | 1 mm | 3 mm | 1 mm (B) | Without |
| KOYOML1003 | Deep groove ball bearing | 1 mm | 3 mm | 1.5 mm (B) | Open |
| NSKMR31 | Deep groove ball bearing | 1 mm | 3 mm | 1.5 mm (B) | Open |
| KOYO691 | Deep groove ball bearing | 1 mm | 4 mm | 1.6 mm (B) | Open |
| NSK691 | Deep groove ball bearing | 1 mm | 4 mm | 1.6 mm (B) | Open |
| KOYOF691 | Deep groove ball bearing | 1 mm | 4 mm | 1.6 mm (B) | Open |
| NSKF691 | Deep groove ball bearing | 1 mm | 4 mm | 1.6 mm (B) | Open |
| NSKR09 | Deep groove ball bearing | 1.016 mm | 3.175 mm | 1.191 mm (B) | Open |
| NSKFR0 | Deep groove ball bearing | 1.191 mm | 3.967 mm | 1.588 mm (B) | Open |
| NSKR0 | Deep groove ball bearing | 1.191 mm | 3.967 mm | 1.588 mm (B) | Open |
| NSKMF41X | Deep groove ball bearing | 1.2 mm | 4 mm | 1.8 mm (B) | Open |
| KOYOML1204 | Deep groove ball bearing | 1.2 mm | 4 mm | 1.8 mm (B) | Open |
| NSKMR41X | Deep groove ball bearing | 1.2 mm | 4 mm | 1.8 mm (B) | Open |
| NSKFR1 | Deep groove ball bearing | 1.397 mm | 4.762 mm | 1.984 mm (B) | Open |
| NSKR1 | Deep groove ball bearing | 1.397 mm | 4.762 mm | 1.984 mm (B) | Open |
| KOYO68/1.5 | Deep groove ball bearing | 1.5 mm | 4 mm | 1.2 mm (B) | Open |
| NSK681X | Deep groove ball bearing | 1.5 mm | 4 mm | 1.2 mm (B) | Open |
| KOYOF68/1.5 | Deep groove ball bearing | 1.5 mm | 4 mm | 1.2 mm (B) | Open |
| NSKF681X | Deep groove ball bearing | 1.5 mm | 4 mm | 1.2 mm (B) | Open |
| SKFW 618/1.5 | Stainless steel deep groove ball bearing | 1.5 mm | 4 mm | 1.2 mm (B) | Without |
Page 1
Read the width symbol: B, T and H are not interchangeable labels. For a tapered pair use assembly T, not the cone width. Needle designs without an inner ring may use roller-set bore Fw instead of d and are outside this d/D chart. Matched sets, housings and loose cups/cones are also excluded. Open the full product to check drawings, ratings, seals, clearance and precision.
Snapshot 2026-10-02. Every row keeps its actual product link and source-reported units; missing or ambiguous geometry is withheld. Equal nominal size alone does not approve replacement. Inch display is a conversion, rounded to six decimals, not an inch-series classification.
Measuring a needle bearing without rings?
Use the separate Fw / Ew / cage-width chart. It distinguishes ring bores from roller-complement diameters and keeps thrust-cage roller diameter separate from washer-inclusive height.
Open the source-labelled needle size chart →Looking up a thrust bearing by height?
Use the complete axial assembly chart to distinguish shaft and housing washer diameters, load directions and the envelope with a specified aligning seat washer.
Open the thrust bearing size query →What to check
What is included
Model and exact-size charts are built from existing catalogue records. Models without a loaded record remain search requests, not invented specification pages.
How to compare a row
Use brand, full designation and bearing type as well as d×D×B. A flange, snap-ring groove, extended inner ring or tapered assembly may need dimensions beyond the three-column envelope.
Print a chart
Open a model or exact-size result, then use Print / Save PDF. The printed chart retains the reference limitations and product identifiers.
Continue with real catalogue data
Preserve the full model, source description and unknown fields when making your shortlist. This reference website does not sell bearings or certify a replacement.
Related questions and tools
How to measure bearing bore, outside diameter & width
Record the component marking before measuring. The size finder expects bore d, outside diameter D and width B in that order, not the order in which the numbers happen to appear on a label.
Read and apply →Inch bearing sizes, fractions & millimetre conversion
One inch is exactly 25.4 mm. Unit conversion changes the expression of a size, not its physical size or tolerance.
Read and apply →Bearing number decoder: series, bore codes & suffixes
A designation is a structured identifier, not a universal arithmetic formula. Read the complete prefix, basic number and suffix together.
Read and apply →Bearing weight & mass lookup
Bearing mass is a catalogue attribute. A solid-ring estimate cannot reproduce the mass of rings, rolling elements, cage and seals.
Read and apply →Bearing size charts: PDF downloads
Download searchable English tables with the brand, complete designation, source-labelled dimensions in millimetres and links to the matching model records. Choose a family or a series; the charts preserve construction differences instead of treating every size as interchangeable.
Scope: original BearingScope reference tables from our verified catalogue snapshots. These are not manufacturer manuals, CAD, full technical datasheets or a complete list of all bearing sizes. Equal dimensions do not establish interchangeability. No load ratings, tolerances or vehicle fitment are inferred.
Download PDF
Angular contact ball bearings
8,032 dimension rows · 8,032 model records · FAG, KOYO, NTN, SKF
Self-aligning ball bearings
796 dimension rows · 796 model records · FAG, KOYO, NSK, SKF
Cylindrical roller bearings
4,531 dimension rows · 4,531 model records · FAG, KOYO, NTN, SKF
Spherical roller bearings
4,030 dimension rows · 4,030 model records · FAG, KOYO, SKF
Tapered roller bearings
2,346 dimension rows · 2,346 model records · FAG, KOYO, SKF
Needle roller bearings and cages
3,031 dimension rows · 3,031 model records · FAG, INA, KOYO, NTN, SKF
Thrust ball bearings
1,137 dimension rows · 1,008 model records · FAG, NSK, SKF
Thrust roller bearings
522 dimension rows · 522 model records · FAG, INA, NTN, SKF
6000 series ball bearings
1,418 dimension rows · 1,418 model records · FAG, KOYO, NACHI, NSK, NTN, SKF
6200 series ball bearings
1,909 dimension rows · 1,909 model records · FAG, KOYO, NACHI, NSK, NTN, SKF
Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.