Bearing size reference
Tapered roller bearings: size tables
Tapered rollers between a cone and a cup carry heavy combined radial and axial loads — the wheel-hub and gearbox workhorse.
A tapered roller bearing has a separable cup (outer ring) and cone (inner ring with rollers and cage). The tapered geometry carries combined loads; the axial load acts in one direction, so they are usually mounted in pairs and adjusted against each other.
Metric tapered bearings follow ISO 355. Three widths matter: T is the total assembled width, B the cone width and C the cup width. The 302, 303, 320 (X), 322 and 323 series differ in section and width; inch tapered bearings use separate cone/cup numbers such as LM11949/LM11910.
| Property | |
|---|---|
| Loads | Heavy combined radial and axial (one direction per bearing) |
| Typical uses | Vehicle wheel hubs, Gearboxes and differentials, Agricultural machinery, Machine-tool spindles |
| Standard sizes listed | 85 |
| Dimension standard | ISO 355 |
Dimension series 02
302 series
Light series, the most common metric tapered roller bearings.
| Designation | d (mm) | D (mm) | T (mm) | B cone (mm) | C cup (mm) |
|---|---|---|---|---|---|
| 30202 | 15 | 35 | 11.75 | 11 | 10 |
| 30203 | 17 | 40 | 13.25 | 12 | 11 |
| 30204 | 20 | 47 | 15.25 | 14 | 12 |
| 30205 | 25 | 52 | 16.25 | 15 | 13 |
| 30206 | 30 | 62 | 17.25 | 16 | 14 |
| 30207 | 35 | 72 | 18.25 | 17 | 15 |
| 30208 | 40 | 80 | 19.75 | 18 | 16 |
| 30209 | 45 | 85 | 20.75 | 19 | 16 |
| 30210 | 50 | 90 | 21.75 | 20 | 17 |
| 30211 | 55 | 100 | 22.75 | 21 | 18 |
| 30212 | 60 | 110 | 23.75 | 22 | 19 |
| 30213 | 65 | 120 | 24.75 | 23 | 20 |
| 30214 | 70 | 125 | 26.25 | 24 | 21 |
| 30215 | 75 | 130 | 27.25 | 25 | 22 |
| 30216 | 80 | 140 | 28.25 | 26 | 22 |
| 30217 | 85 | 150 | 30.5 | 28 | 24 |
| 30218 | 90 | 160 | 32.5 | 30 | 26 |
| 30219 | 95 | 170 | 34.5 | 32 | 27 |
| 30220 | 100 | 180 | 37 | 34 | 29 |
Dimension series 03
303 series
Medium series with steeper sections for heavier loads.
| Designation | d (mm) | D (mm) | T (mm) | B cone (mm) | C cup (mm) |
|---|---|---|---|---|---|
| 30302 | 15 | 42 | 14.25 | 13 | 11 |
| 30303 | 17 | 47 | 15.25 | 14 | 12 |
| 30304 | 20 | 52 | 16.25 | 15 | 13 |
| 30305 | 25 | 62 | 18.25 | 17 | 15 |
| 30306 | 30 | 72 | 20.75 | 19 | 16 |
| 30307 | 35 | 80 | 22.75 | 21 | 18 |
| 30308 | 40 | 90 | 25.25 | 23 | 20 |
| 30309 | 45 | 100 | 27.25 | 25 | 22 |
| 30310 | 50 | 110 | 29.25 | 27 | 23 |
| 30311 | 55 | 120 | 31.5 | 29 | 25 |
| 30312 | 60 | 130 | 33.5 | 31 | 26 |
| 30313 | 65 | 140 | 36 | 33 | 28 |
| 30314 | 70 | 150 | 38 | 35 | 30 |
| 30315 | 75 | 160 | 40 | 37 | 31 |
| 30316 | 80 | 170 | 42.5 | 39 | 33 |
| 30317 | 85 | 180 | 44.5 | 41 | 34 |
| 30318 | 90 | 190 | 46.5 | 43 | 36 |
| 30319 | 95 | 200 | 49.5 | 45 | 38 |
| 30320 | 100 | 215 | 51.5 | 47 | 39 |
Dimension series 20
320 X series
Thin, compact series; the X marks the ISO-compliant design.
| Designation | d (mm) | D (mm) | T (mm) | B cone (mm) | C cup (mm) |
|---|---|---|---|---|---|
| 32004X | 20 | 42 | 15 | 15 | 12 |
| 32005X | 25 | 47 | 15 | 15 | 11.5 |
| 32006X | 30 | 55 | 17 | 17 | 13 |
| 32007X | 35 | 62 | 18 | 18 | 14 |
| 32008X | 40 | 68 | 19 | 19 | 14.5 |
| 32009X | 45 | 75 | 20 | 20 | 15.5 |
| 32010X | 50 | 80 | 20 | 20 | 15.5 |
| 32011X | 55 | 90 | 23 | 23 | 17.5 |
| 32012X | 60 | 95 | 23 | 23 | 17.5 |
| 32013X | 65 | 100 | 23 | 23 | 17.5 |
| 32014X | 70 | 110 | 25 | 25 | 19 |
| 32015X | 75 | 115 | 25 | 25 | 19 |
| 32016X | 80 | 125 | 29 | 29 | 22 |
| 32017X | 85 | 130 | 29 | 29 | 22 |
| 32018X | 90 | 140 | 32 | 32 | 24 |
| 32019X | 95 | 145 | 32 | 32 | 24 |
| 32020X | 100 | 150 | 32 | 32 | 24 |
Dimension series 22
322 series
Wide light series — common in wheel hubs and gearboxes.
| Designation | d (mm) | D (mm) | T (mm) | B cone (mm) | C cup (mm) |
|---|---|---|---|---|---|
| 32204 | 20 | 47 | 19.25 | 18 | 15 |
| 32205 | 25 | 52 | 19.25 | 18 | 16 |
| 32206 | 30 | 62 | 21.25 | 20 | 17 |
| 32207 | 35 | 72 | 24.25 | 23 | 19 |
| 32208 | 40 | 80 | 24.75 | 23 | 19 |
| 32209 | 45 | 85 | 24.75 | 23 | 19 |
| 32210 | 50 | 90 | 24.75 | 23 | 19 |
| 32211 | 55 | 100 | 26.75 | 25 | 21 |
| 32212 | 60 | 110 | 29.75 | 28 | 24 |
| 32213 | 65 | 120 | 32.75 | 31 | 27 |
| 32214 | 70 | 125 | 33.25 | 31 | 27 |
| 32215 | 75 | 130 | 33.25 | 31 | 27 |
| 32216 | 80 | 140 | 35.25 | 33 | 28 |
| 32217 | 85 | 150 | 38.5 | 36 | 30 |
| 32218 | 90 | 160 | 42.5 | 40 | 34 |
| 32219 | 95 | 170 | 45.5 | 43 | 37 |
| 32220 | 100 | 180 | 49 | 46 | 39 |
Dimension series 23
323 series
Wide medium series for the heaviest loads.
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