30318 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 30318. 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.
30318 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. 8 recorded variants are listed. A dash means the value is missing, not zero.
Read the original dimensions for 30318
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 30318 — 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 X30318M and cup Y30318M. 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 | 90 mm / 3.5433 in |
| O.D. (D) | D | 190 mm / 7.4803 in |
| Width (T) | T | 46.5 mm / 1.8307 in |
| Inner Ring Width (B) | B | 43 mm / 1.6929 in |
| Outer Ring Width (C) | C | 36 mm / 1.4173 in |
| Effective Center Location | Not supplied separately | -9.4 mm / -0.37 in |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Max Shaft Fillet Radius | Not supplied separately | 4 mm / 0.157 in |
| Max Housing Fillet Radius | Not supplied separately | 3 mm / 0.118 in |
| Shaft Backing Shoulder Dia. - Frontface (da) | da | 105 mm / 4.13 in |
| Shaft Backing Shoulder Dia. - Backface (db) | db | 112 mm / 4.41 in |
| Housing Backing Shoulder Dia. - Frontface (Da) | Da | 176 mm / 6.93 in |
| Housing Backing Shoulder Dia. - Backface (Db) | Db | 173 mm / 6.81 in |
| Cage Location rel. to BF (Aa) | Aa | 3.8 mm / 0.15 in |
| Cage Location rel. to FF (Ab) | Ab | 6.4 mm / 0.25 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) |
|---|---|---|---|---|---|---|
| SKF30318Single row tapered roller bearing |
| 353 kN | 400 kN | 2600 rpm | 3600 rpm | 5.63 kg5630 g |
| TIMKEN30318Tapered roller bearing |
| 406 kN | 429 kN | — | — | 5.66 kg5660 g |
| FAG30318-ATapered roller bearing |
| 330 kN | 395 kN | 3050 rpm | 3850 rpm | 5.8 kg5800 g |
| FAG30318-HTapered roller bearing |
| 314 kN | 395 kN | 3050 rpm | 3080 rpm | 5.8 kg5800 g |
| KOYO30318DJRTapered roller bearing |
| 359 kN | 350 kN | — | 1700 rpmLimiting Speeds(Grease Lub.): 1700 min-1Limiting Speeds(Oil Lub.): 2400 min-1 | 5.57 kg5570 g |
| KOYO30318DRTapered roller bearing |
| 352 kN | 336 kN | — | 1700 rpmLimiting Speeds(Grease Lub.): 1700 min-1Limiting Speeds(Oil Lub.): 2400 min-1 | 5.6 kg5600 g |
| KOYO30318JRTapered roller bearing |
| 432 kN | 420 kN | — | 2100 rpmLimiting Speeds(Grease Lub.): 2100 min-1Limiting Speeds(Oil Lub.): 2700 min-1 | 6.04 kg6040 g |
| KOYO30318RTapered roller bearing |
| 421 kN | 407 kN | — | 2100 rpmLimiting Speeds(Grease Lub.): 2100 min-1Limiting Speeds(Oil Lub.): 2700 min-1 | 5.78 kg5780 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 30318 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| TIMKEN 30318 | Open | ABMA Class K | Not recorded | Steel cage | Not recorded | Not recorded |
| FAG 30318-A | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| FAG 30318-H | Not recorded | PN — Normal (ISO 492:2023) | Not recorded | Standard — Sheet steel cage, window cage, roller-guided | Not recorded | Not recorded |
| KOYO 30318DJR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 30318DR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 30318JR | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 30318R | 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.
30318
Tapered roller bearing
View full technical record →SKF30318
Single row tapered roller bearing
View full technical record →FAG30318-A
Tapered roller bearing
View full technical record →KOYO30318DJR
Tapered roller bearing
View full technical record →KOYO30318DR
Tapered roller bearing
View full technical record →FAG30318-H
Tapered roller bearing
View full technical record →KOYO30318JR
Tapered roller bearing
View full technical record →KOYO30318R
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.