3780 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 3780. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page7 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.
TIMKEN 3780 — individual cone dimensions
TIMKEN 3780 is an individual tapered-roller cone: the inner ring, rollers and cage, not the complete cone-and-cup bearing. The manufacturer lists bore d = 50.8 mm (2 in) and inner-ring width B = 30.302 mm (1.1930 in).
| Measurement | Symbol | Metric | Inches |
|---|---|---|---|
| Bore (d) | d | 50.8 mm | 2 in |
| Inner Ring Width (B) | B | 30.302 mm | 1.1930 in |
| Effective Center Location | Not specified | -8.1 mm | -0.32 in |
| Shaft Backing Shoulder Diameter - Frontface (da) | da | 58 mm | 2.28 in |
| Shaft Backing Shoulder Diameter - Backface (db) | db | 64 mm | 2.52 in |
| Cage Location rel. to BF (Aa) | Aa | 1.5 mm | 0.06 in |
| Cage Location rel. to FF (Ab) | Ab | 1.5 mm | 0.06 in |
Use the component number correctly
- The bore identifies the shaft-side nominal opening. B measures this cone only; it is not the assembled bearing width T. This single-cone record does not establish an outside diameter D or a matching cup.
- Preserve the full component number and its suffix. A shared prefix, similar ring size or a related-products suggestion does not approve a cone/cup combination or a cross-brand replacement.
- For a complete bearing, check both component markings and the manufacturer’s assembled d×D×T record. B+C is not a valid way to calculate T. A seal, axle rating, vehicle application and tightening procedure need their own evidence.
- Optional measurements with inconsistent printed metric and inch values are omitted from this supplement: Max Shaft Fillet Radius. Verify the manufacturer drawing before using these particular limits.
Factual reference: Timken official individual-component catalogue; source snapshot 2026-10-02. Original interpretation by BearingScope. These measurements do not certify a complete assembly, fit or interchange.
TIMKEN 3780 — bearing pairs and set identification
For TIMKEN 3780, the component number alone does not establish every dimension of a complete bearing. This reference identifies documented cone/cup combinations that contain 3780; select the row matching both of your component markings.
Complete bearing dimensions by exact pair
These TS single-row tapered-roller combinations are reproduced as factual measurements from the 2002 reference. Dimensions are not a fitment approval or a current availability claim. Each cell keeps both published units.
| Cone / cup | Bore d | Outside D | Assembly T |
|---|---|---|---|
| 3780 / 3720 | 50.800 mm 2.000 in | 93.264 mm 3.672 in | 30.162 mm 1.188 in |
| 3780 / 3726 | 50.800 mm 2.000 in | 95.250 mm 3.750 in | 30.162 mm 1.188 in |
| 3780 / 3730 | 50.800 mm 2.000 in | 93.264 mm 3.672 in | 30.162 mm 1.188 in |
| 3780 / 3732 | 50.800 mm 2.000 in | 98.425 mm 3.875 in | 30.162 mm 1.188 in |
Separate ring widths B / C and source page references
B and C below describe separate components. Their sum is not the assembly width T.
| Cone / cup | Cone width B | Cup width C | 2002 PDF pages |
|---|---|---|---|
| 3780 / 3720 | 30.302 mm 1.193 in | 23.812 mm 0.938 in | 245, 338 |
| 3780 / 3726 | 30.302 mm 1.193 in | 23.812 mm 0.938 in | 245, 338 |
| 3780 / 3730 | 30.302 mm 1.193 in | 23.812 mm 0.938 in | 245, 338 |
| 3780 / 3732 | 30.302 mm 1.193 in | 23.812 mm 0.938 in | 245, 338 |
What to confirm before using this reference
- d is the cone bore, D is the cup outside diameter and T is the complete bearing width for the exact pair. B and C measure the separate rings; do not add B and C to calculate T.
- The dimensional table is a historical identification reference from the 2002 Timken Bearing Specification Guide, not a current engineering drawing. Printed metric and inch values are retained, including their original rounding. Check the current drawing before specifying fits or machining.
- A component may appear with several mating numbers. A match here documents that exact Timken combination; it does not approve other suffixes, mixed-brand rings, a vehicle application or a substitute with similar dimensions.
- A cone-and-cup set is not automatically a complete wheel-end repair kit. Seal numbers, collars, spacers and quantities must be confirmed separately unless the specific set note below explicitly lists them.
- For replacement work, inspect and replace the mating cup and cone together as specified for the assembly. Retaining a worn ring or mixing manufacturer geometries can change the contact pattern even when nominal diameters match.
- An axle tightening torque, preload or endplay target cannot be derived from these dimensions. Use the procedure for the identified hub or machine, including any pre-adjusted system restrictions.
Manufacturer references: Timken Bearing Specification Guide, Order 7534 (2002, archived distributor-hosted copy); Timken MileMate set chart, Order 5523 (May 2024), where listed; Timken cup-and-cone replacement guidance, Order 10832 (2016). Sources checked 2026-10-02. Measurement rows and set identities are kept separate by edition. BearingScope provides independent identification guidance, not sales or installation certification.
3780 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. 24 recorded variants are listed. A dash means the value is missing, not zero.
Read the original dimensions for 3780
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 3780 / 3720 — 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 3780 and cup 3720. 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 Max Shaft Fillet Radius, 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 | 50.8 mm / 2 in |
| O.D. (D) | D | 93.264 mm / 3.6718 in |
| Width (T) | T | 30.163 mm / 1.1875 in |
| Inner Ring Width (B) | B | 30.302 mm / 1.1930 in |
| Outer Ring Width (C) | C | 23.813 mm / 0.9375 in |
| Effective Center Location | Not supplied separately | -8.1 mm / -0.32 in |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Max Shaft Fillet Radius | Not supplied separately | 3.600 mm / 0.140 in — source units differ; verify before use |
| Max Housing Fillet Radius | Not supplied separately | 3.30 mm / 0.130 in |
| Shaft Backing Shoulder Dia. - Frontface (da) | da | 58 mm / 2.28 in |
| Shaft Backing Shoulder Dia. - Backface (db) | db | 64 mm / 2.52 in |
| Housing Backing Shoulder Dia. - Frontface (Da) | Da | 87.90 mm / 3.50 in — source units differ; verify before use |
| Housing Backing Shoulder Dia. - Backface (Db) | Db | 82.04 mm / 3.23 in |
| Cage Location rel. to BF (Aa) | Aa | 1.5 mm / 0.06 in |
| Cage Location rel. to FF (Ab) | Ab | 1.5 mm / 0.06 in |
Catalogue parameters for 3780
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 3780 — 16 recorded parameters
Single row tapered roller bearing, cone
Reference: SKF product catalogue; source snapshot 2026-09-02.
SKF 3780 is the inner-ring/cone component, not a complete cone-and-cup assembly. Its recorded bore is 50.8 mm and inner-ring width is 30.302 mm.
Calculated inch reference (cone bore × inner-ring width): 2 × 1.192992 in. This converts the recorded millimetres using exactly 25.4 mm/in and rounds to six decimals; it does not change the nominal series or supply machining tolerances.
An assembled outside diameter and total set width cannot be obtained from these two component dimensions. Match the separately identified cup and its documented assembly before evaluating a replacement; the record does not establish that pairing.
This designation identifies a tapered-bearing component. A cone or cup alone is not the assembled bearing; use the documented pairing and total assembly width before comparing an interchange.
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 | 50.8 mm |
| Width, total | Not separately recorded | 30.302 mm |
| Width, inner ring | Not separately recorded | 30.302 mm |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating | Not separately recorded | 134.0 kN |
| Basic static load rating | Not separately recorded | 146.0 kN |
Properties
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bearing part | Not separately recorded | Inner ring, cage and roller assembly (cone assembly) |
| 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 | Inch |
| Indicative carbon footprint for new product | Not separately recorded | 2.1 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.578 kg |
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) |
|---|---|---|---|---|---|---|
| SKF3780Single row tapered roller bearing, cone |
| 134 kN | 146 kN | — | — | 0.578 kg578 g |
| SKF3780/3720Single row tapered roller bearing |
| 134 kN | 146 kN | 5600 rpm | 7000 rpm | 0.88 kg880 g |
| SKF3780/3720/VA983Special single row tapered roller bearing |
| 107 kN | 132 kN | 5300 rpm | 7000 rpm | 0.842 kg842 g |
| SKF3780/VA983Special single row tapered roller bearing, cone |
| 107 kN | 132 kN | — | — | 0.554 kg554 g |
| TIMKEN3780 / 3720Tapered roller bearing |
| 122 kN | 153 kN | — | — | 0.86 kg860 g |
| TIMKEN3780 / 3720BTapered roller bearing |
| 122 kN | 153 kN | — | — | 0.89 kg890 g |
| TIMKEN3780 / 3727Tapered roller bearing |
| 122 kN | 153 kN | — | — | 0.86 kg860 g |
| TIMKEN3780 / 3730Tapered roller bearing |
| 122 kN | 153 kN | — | — | 0.87 kg870 g |
| TIMKEN3780 / 3732Tapered roller bearing |
| 122 kN | 153 kN | — | — | 1 kg1000 g |
| TIMKEN3780 / 3733Tapered roller bearing |
| 122 kN | 153 kN | — | — | 1.06 kg1060 g |
| TIMKEN3780 / 3735Tapered roller bearing |
| 122 kN | 153 kN | — | — | 1.04 kg1040 g |
| TIMKEN3780-90054Tapered roller bearing |
| 122 kN | 153 kN | — | — | 0.86 kg860 g |
| TIMKEN3780-90061Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.85 kg1850 g |
| TIMKEN3780-90064Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.85 kg1850 g |
| TIMKEN3780-90093Tapered roller bearing |
| 122 kN | 153 kN | — | — | 0.91 kg910 g |
| TIMKEN3780-90137Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.85 kg1850 g |
| TIMKEN3780-90162Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.85 kg1850 g |
| TIMKEN3780-902A4Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.85 kg1850 g |
| TIMKEN3780-902A6Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.85 kg1850 g |
| TIMKEN3780-902A8Tapered roller bearing |
| 213 kN | 305 kN | — | — | 1.84 kg1840 g |
| KOYO3780/1YD/20Automotive bearing |
| — | — | — | — | 0.851 kg851 g |
| KOYO3780/20Tapered roller bearing |
| 129 kN | 137 kN | — | 4200 rpmLimiting Speeds(Grease Lub.): 4200 min-1Limiting Speeds(Oil Lub.): 5500 min-1 | 0.835 kg835 g |
| KOYO3780/30Tapered roller bearing |
| 129 kN | 137 kN | — | 4200 rpmLimiting Speeds(Grease Lub.): 4200 min-1Limiting Speeds(Oil Lub.): 5500 min-1 | 0.84 kg840 g |
| KOYO3780/32Tapered roller bearing |
| 129 kN | 137 kN | — | 4200 rpmLimiting Speeds(Grease Lub.): 4200 min-1Limiting Speeds(Oil Lub.): 5500 min-1 | 0.98 kg980 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 3780 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 3780/3720 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 3780/3720/VA983 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 3780/VA983 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| TIMKEN 3780 / 3720 | Open | ABMA Class 4 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780 / 3720B | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780 / 3727 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 3780 / 3730 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780 / 3732 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780 / 3733 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 3780 / 3735 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 3780-90054 | Open | ABMA Class 0 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-90061 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-90064 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-90093 | Open | ABMA Class 0 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-90137 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-90162 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-902A4 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-902A6 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 3780-902A8 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| KOYO 3780/1YD/20 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 3780/20 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 3780/30 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 3780/32 | 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.
3780
Single row tapered roller bearing, cone
View full technical record →KOYO3780/1YD/20
Automotive bearing
View full technical record →KOYO3780/20
Tapered roller bearing
View full technical record →KOYO3780/30
Tapered roller bearing
View full technical record →KOYO3780/32
Tapered roller bearing
View full technical record →TIMKEN3780 / 3720
Tapered roller bearing
View full technical record →SKF3780/3720
Single row tapered roller bearing
View full technical record →TIMKEN3780 / 3720B
Tapered roller bearing
View full technical record →SKF3780/3720/VA983
Special single row tapered roller bearing
View full technical record →TIMKEN3780 / 3727
Tapered roller bearing
View full technical record →TIMKEN3780 / 3730
Tapered roller bearing
View full technical record →TIMKEN3780 / 3732
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.