31308 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 31308. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
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Find by measured dimensions
Enter bore d, outside diameter D and width B. Use decimals or inch fractions such as 1/2 or 1 1/4.
31308 dimensions and recorded technical data
Use the named dimensions for each complete record below. A generic d×D×B answer is not asserted where the base record is missing, dimension symbols are unverified, or the product uses a different geometry such as a housing or thrust assembly. Suffix records are not substituted for a missing base specification.
The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 10 recorded variants are listed. A dash means the value is missing, not zero.
Read the original dimensions for 31308
Boundary size alone does not describe every ring, shoulder or assembled unit. These tables retain the recorded manufacturer labels, symbols, units and limits for each complete marking. Expand a record to check its detailed measurements.
Important: an approximate value, a minimum or a maximum keeps that qualifier. These reference extracts are not CAD drawings, fit recommendations or replacement approvals.
TIMKEN 31308 — 14 dimension fields
Tapered roller bearing. Source: Timken official dimensional catalogue; recorded snapshot 2026-10-01.
Metric and inch measurements below are the values published together in this dated manufacturer record. Their displayed rounding is retained; the inch column does not turn a metric design into an inch-series design.
This assembly is identified by cone X31308M and cup Y31308M. T is the assembled width; B and C are the separate ring widths. A loose cone, a loose cup and the complete assembly are not the same item.
Shaft and housing backing-shoulder dimensions, maximum fillet radii and signed offsets answer different installation questions. Preserve the named face, limit and sign; they are not additional bearing outside diameters or nominal widths.
This factual extract is a dimensional reference, not an OEM fitment statement, a replacement approval or a downloadable CAD model.
Bearing and component measurements
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Bore (d) | d | 40 mm / 1.5748 in |
| O.D. (D) | D | 90 mm / 3.5433 in |
| Width (T) | T | 25.250 mm / 0.9941 in |
| Inner Ring Width (B) | B | 23.000 mm / 0.9055 in |
| Outer Ring Width (C) | C | 17 mm / 0.6693 in |
| Effective Center Location | Not supplied separately | 4.1 mm / 0.16 in |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Max Shaft Fillet Radius | Not supplied separately | 2.030 mm / 0.080 in |
| Max Housing Fillet Radius | Not supplied separately | 1.52 mm / 0.06 in |
| Shaft Backing Shoulder Dia. - Frontface (da) | da | 52 mm / 2.05 in |
| Shaft Backing Shoulder Dia. - Backface (db) | db | 61 mm / 2.4 in |
| Housing Backing Shoulder Dia. - Frontface (Da) | Da | 86.40 mm / 3.40 in |
| Housing Backing Shoulder Dia. - Backface (Db) | Db | 75.95 mm / 2.99 in |
| Cage Location rel. to BF (Aa) | Aa | 3.3 mm / 0.13 in |
| Cage Location rel. to FF (Ab) | Ab | 3.8 mm / 0.15 in |
No recorded variant matches these filters. Clear a filter to see other records; no substitute has been inferred.
| Brand / full designation | Named dimensions (mm / in) | Dynamic C (kN) | Static C0 (kN) | Reference speed (rpm) | Limiting speed (rpm) | Mass (kg / g) |
|---|---|---|---|---|---|---|
| SKF31308Single row tapered roller bearing |
| 91.1 kN | 81.5 kN | 5600 rpm | 7500 rpm | 0.72 kg720 g |
| TIMKEN31308Tapered roller bearing |
| 101 kN | 88.1 kN | — | — | 0.71 kg710 g |
| SKF31308/CL7CSingle row tapered roller bearing |
| 91.1 kN | 81.5 kN | 5600 rpm | 7500 rpm | 0.72 kg720 g |
| SKF31308/CL7CDFMatched tapered roller bearings arranged face-to-face |
| 156 kN | 163 kN | 4500 rpm | 7500 rpm | 1.49 kg1490 g |
| FAG31308-ATapered roller bearing |
| 76 kN | 83 kN | 5100 rpm | 8000 rpm | 0.715 kg715 g |
| FAG31308-DY-XLTapered roller bearing |
| 89 kN | 82 kN | 5100 rpm | 9600 rpm | 0.73 kg730 g |
| FAG31308-HTapered roller bearing |
| 72.2 kN | 83 kN | 5100 rpm | 6400 rpm | 0.73 kg730 g |
| FAG31308-XLTapered roller bearing |
| 94 kN | 83 kN | 5100 rpm | 9600 rpm | 0.72 kg720 g |
| FAG31308-XL-DF-A0-35Tapered roller bearing set |
| 161 kN | 165 kN | 5100 rpm | 9600 rpm | 1.52 kg1520 g |
| FAG31308-XL-W60BTapered roller bearing |
| 98 kN | 83 kN | 5100 rpm | 9600 rpm | 0.72 kg720 g |
Compare recorded seals, clearance, precision and materials
Manufacturer wording is retained. A missing property is not inferred from another brand or a similar suffix.
| Brand / designation | Closure | Original precision | Clearance | Cage | Material | Lubricant |
|---|---|---|---|---|---|---|
| SKF 31308 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| TIMKEN 31308 | Open | ABMA Class K | Not recorded | Steel cage | Not recorded | Not recorded |
| SKF 31308/CL7C | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 31308/CL7CDF | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| FAG 31308-A | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 31308-DY-XL | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 31308-H | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 31308-XL | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 31308-XL-DF-A0-35 | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 31308-XL-W60B | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
How to compare these values
- Use the displayed dimension names and original symbols. Housing length L, height H2 and flange width are not bearing outside diameter D. A catalogue width with an unverified symbol must not be assumed to be inner-ring width B or assembly width T. Open the product record for mounting dimensions and geometry.
- Inch values are calculated from the recorded millimetres using 25.4 mm per inch, rounded to six decimal places. They do not change a metric bearing into an inch-series bearing. Gram values are converted from the recorded mass in kilograms.
- C and C0 describe different rating conditions. They are not a single safe working-load limit and cannot replace an application load calculation.
- Reference and limiting speeds are separate catalogue values. The source grease/oil context is shown where recorded. Lubricant, seals, loads, fit, clearance and cooling affect the usable operating speed.
- A common base number does not prove equivalent seals, clearance, precision, material or interchangeability. Open the full designation for these fields.
Related prefix matches — other model numbers may appear
These discovery results can contain a longer number or a different component. They are not specifications for the requested exact model. Open the complete product to inspect its original geometry.
31308
Tapered roller bearing
View full technical record →SKF31308
Single row tapered roller bearing
View full technical record →FAG31308-A
Tapered roller bearing
View full technical record →SKF31308/CL7C
Single row tapered roller bearing
View full technical record →SKF31308/CL7CDF
Matched tapered roller bearings arranged face-to-face
View full technical record →FAG31308-DY-XL
Tapered roller bearing
View full technical record →FAG31308-H
Tapered roller bearing
View full technical record →FAG31308-XL
Tapered roller bearing
View full technical record →FAG31308-XL-DF-A0-35
Tapered roller bearing set
View full technical record →FAG31308-XL-W60B
Tapered roller bearing
View full technical record →Check the drawing before substituting
Nominal dimensions are not shaft-fit tolerances. Different variants can add grooves, flanges, wider rings or assembly components. When the table has different dimensions, the complete designation—not the shared prefix—controls.
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.