30306 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 30306. 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.
30306 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. 11 recorded variants are listed. A dash means the value is missing, not zero.
Read the original dimensions for 30306
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 30306 — 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 X30306M and cup Y30306M. 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.
The source lists differing metric/inch values for Housing Backing Shoulder Dia. - Frontface (Da). These values are retained as a visible source discrepancy; confirm the current drawing before using them.
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 | 30 mm / 1.1811 in |
| O.D. (D) | D | 72 mm / 2.8346 in |
| Width (T) | T | 20.75 mm / 0.8169 in |
| Inner Ring Width (B) | B | 19.000 mm / 0.7480 in |
| Outer Ring Width (C) | C | 16 mm / 0.6299 in |
| Effective Center Location | Not supplied separately | -5.6 mm / -0.22 in |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Max Shaft Fillet Radius | Not supplied separately | 1.520 mm / 0.060 in |
| Max Housing Fillet Radius | Not supplied separately | 1.52 mm / 0.06 in |
| Shaft Backing Shoulder Dia. - Frontface (da) | da | 38 mm / 1.5 in |
| Shaft Backing Shoulder Dia. - Backface (db) | db | 40 mm / 1.57 in |
| Housing Backing Shoulder Dia. - Frontface (Da) | Da | 67.10 mm / 2.68 in — source units differ; verify before use |
| Housing Backing Shoulder Dia. - Backface (Db) | Db | 62.99 mm / 2.48 in |
| Cage Location rel. to BF (Aa) | Aa | 0.8 mm / 0.03 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) |
|---|---|---|---|---|---|---|
| SKF30306Single row tapered roller bearing |
| 69.2 kN | 56 kN | 8000 rpm | 10000 rpm | 0.383 kg383 g |
| TIMKEN30306Tapered roller bearing |
| 67.7 kN | 65.3 kN | — | — | 0.4 kg400 g |
| SKF30306 J2/QCLNSingle row tapered roller bearing |
| 56.1 kN | 56 kN | 7500 rpm | 10000 rpm | 0.383 kg383 g |
| SKF30306/VA983Special single row tapered roller bearing |
| 61.5 kN | 58.5 kN | 7500 rpm | 10000 rpm | 0.389 kg389 g |
| FAG30306-ATapered roller bearing |
| 60 kN | 61 kN | 7100 rpm | 11000 rpm | 0.3983 kg398.3 g |
| FAG30306-A>ATapered roller bearing |
| 60 kN | 61 kN | 7100 rpm | 11000 rpm | 0.394 kg394 g |
| FAG30306-DYTapered roller bearing |
| 56 kN | 56 kN | 7300 rpm | 11000 rpm | 0.384 kg384 g |
| FAG30306-HTapered roller bearing |
| 57 kN | 61 kN | 7100 rpm | 8800 rpm | 0.38 kg380 g |
| FAG30306-XLTapered roller bearing |
| 75 kN | 61 kN | 7100 rpm | 13300 rpm | 0.4022 kg402.2 g |
| KOYO30306DJRTapered roller bearing |
| 63.5 kN | 54.9 kN | — | 4900 rpmLimiting Speeds(Grease Lub.): 4900 min-1Limiting Speeds(Oil Lub.): 6800 min-1 | 0.4 kg400 g |
| KOYO30306JRTapered roller bearing |
| 74.4 kN | 60.1 kN | — | 5800 rpmLimiting Speeds(Grease Lub.): 5800 min-1Limiting Speeds(Oil Lub.): 7700 min-1 | 0.411 kg411 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 30306 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| TIMKEN 30306 | Open | ABMA Class K | Not recorded | Steel cage | Not recorded | Not recorded |
| SKF 30306 J2/QCLN | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 30306/VA983 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| FAG 30306-A | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 30306-A>A | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 30306-DY | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 30306-H | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 30306-XL | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| KOYO 30306DJR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 30306JR | Not recorded | Not recorded | Not recorded | Not recorded | 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.
30306
Tapered roller bearing
View full technical record →SKF30306
Single row tapered roller bearing
View full technical record →FAG30306-A
Tapered roller bearing
View full technical record →FAG30306-A>A
Tapered roller bearing
View full technical record →KOYO30306DJR
Tapered roller bearing
View full technical record →FAG30306-DY
Tapered roller bearing
View full technical record →FAG30306-H
Tapered roller bearing
View full technical record →SKF30306 J2/QCLN
Single row tapered roller bearing
View full technical record →KOYO30306JR
Tapered roller bearing
View full technical record →SKF30306/VA983
Special single row tapered roller bearing
View full technical record →FAG30306-XL
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.