31306 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 31306. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page5 sections ⌄
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.
31306 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. 4 recorded variants are listed. A dash means the value is missing, not zero.
Catalogue parameters for 31306
Choose the complete brand and marking before reading a value. These source-labelled records add dimensions, construction and engineering properties where they were recorded; a shared model number does not establish interchangeability.
Units, ranges and minimum/maximum qualifiers are retained. The data is a dated catalogue reference, not a certified drawing, a complete current specification or an operating approval.
SKF 31306 — 52 recorded parameters
Single row tapered roller bearing
Reference: SKF product catalogue; source snapshot 2026-09-02.
Keep total assembly width distinct from inner- and outer-ring widths. The same nominal bore does not establish a matching cup/cone set.
Values shown are retained from the recorded source. Zero boundary dimensions and zero load ratings from incomplete legacy feeds are withheld rather than presented as usable specifications.
Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | Not separately recorded | 30.0 mm |
| Outside diameter | Not separately recorded | 72.0 mm |
| Width, total | Not separately recorded | 20.75 mm |
| Width, inner ring | Not separately recorded | 19.0 mm |
| Width, outer ring | Not separately recorded | 14.0 mm |
| Contact angle | Not separately recorded | 28.8 ° |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating | Not separately recorded | 58.3 kN |
| Basic static load rating | Not separately recorded | 50.0 kN |
| Reference speed | Not separately recorded | 7500.0 r/min |
| Limiting speed | Not separately recorded | 9500.0 r/min |
| SKF performance class | Not separately recorded | SKF Explorer |
Properties
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bearing part | Not separately recorded | Complete bearing |
| Number of rows | Not separately recorded | 1 |
| Locating feature, bearing outer ring | Not separately recorded | Without |
| Bore type | Not separately recorded | Cylindrical |
| Cage | Not separately recorded | Sheet metal |
| Arrangement of contact angle (double-row bearing) | Not separately recorded | Not applicable |
| Matched arrangement | Not separately recorded | No |
| Coating | Not separately recorded | Without |
| Sealing | Not separately recorded | Without |
| Relubrication feature | Not separately recorded | Without |
| Unit system | Not separately recorded | Metric |
| Indicative carbon footprint for new product | Not separately recorded | 1.4 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.385 kg |
Engineering — Engineering specifications
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Dimension series | Not separately recorded | 7FB |
Engineering — Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 30 mm |
| Outside diameter | D | 72 mm |
| Bearing width, total | T | 20.75 mm |
| Shoulder diameter of inner ring | d 1 | ≈ 52.75 mm |
| Width of inner ring | B | 19 mm |
| Width of outer ring | C | 14 mm |
| Chamfer dimension of inner ring | r 1,2 | min. 1.5 mm |
| Chamfer dimension of outer ring | r 3,4 | min. 1.5 mm |
| Distance side face to pressure point | a | 22.4 mm |
Engineering — Abutment dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Diameter of shaft abutment | d a | max. 40 mm |
| Diameter of shaft abutment | d b | min. 38.5 mm |
| Diameter of housing abutment | D a | min. 55 mm |
| Diameter of housing abutment | D a | max. 64.5 mm |
| Diameter of housing abutment | D b | min. 68 mm |
| Minimum width of space required in housing on large side face | C a | min. 3 mm |
| Minimum width of space required in housing on small side face | C b | min. 6.5 mm |
| Radius of shaft fillet | r a | max. 1.5 mm |
| Radius of housing fillet | r b | max. 1.5 mm |
Engineering — Calculation data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| SKF performance class | Not separately recorded | SKF Explorer |
| Basic dynamic load rating | C | 58.3 kN |
| Basic static load rating | C 0 | 50 kN |
| Fatigue load limit | P u | 5.7 kN |
| Reference speed | Not separately recorded | 7500 r/min |
| Limiting speed | Not separately recorded | 9500 r/min |
| Limiting value | e | 0.83 |
| Calculation factor | Y | 0.72 |
| Calculation factor | Y 0 | 0.4 |
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) |
|---|---|---|---|---|---|---|
| SKF31306Single row tapered roller bearing |
| 58.3 kN | 50 kN | 7500 rpm | 9500 rpm | 0.385 kg385 g |
| SKF31306/DFMatched tapered roller bearings arranged face-to-face |
| 100 kN | 100 kN | 5600 rpm | 9500 rpm | 0.815 kg815 g |
| FAG31306-ATapered roller bearing |
| 45 kN | 46.5 kN | 6400 rpm | 10300 rpm | 0.391 kg391 g |
| FAG31306-HTapered roller bearing |
| 42.8 kN | 46.5 kN | 6400 rpm | 8240 rpm | 0.39277 kg392.77 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 31306 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 31306/DF | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| FAG 31306-A | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 31306-H | 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.
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.