387 A bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 387 A. 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 387A — individual cone dimensions
TIMKEN 387A is an individual tapered-roller cone: the inner ring, rollers and cage, not the complete cone-and-cup bearing. The manufacturer lists bore d = 57.150 mm (2 1/4 in) and inner-ring width B = 21.946 mm (0.8640 in).
| Measurement | Symbol | Metric | Inches |
|---|---|---|---|
| Bore (d) | d | 57.150 mm | 2 1/4 in |
| Inner Ring Width (B) | B | 21.946 mm | 0.8640 in |
| Effective Center Location | Not specified | -3 mm | -0.12 in |
| Shaft Backing Shoulder Diameter - Frontface (da) | da | 63 mm | 2.48 in |
| Shaft Backing Shoulder Diameter - Backface (db) | db | 70 mm | 2.76 in |
| Cage Location rel. to BF (Aa) | Aa | 0.8 mm | 0.03 in |
| Cage Location rel. to FF (Ab) | Ab | 2.8 mm | 0.11 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 387A — bearing pairs and set identification
For TIMKEN 387A, the component number alone does not establish every dimension of a complete bearing. This reference identifies documented cone/cup combinations that contain 387A; 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 |
|---|---|---|---|
| 387A / 382 | 57.150 mm 2.250 in | 98.425 mm 3.875 in | 21.000 mm 0.827 in |
| 387A / 382-S | 57.150 mm 2.250 in | 96.838 mm 3.813 in | 25.400 mm 1.000 in |
| 387A / 382A | 57.150 mm 2.250 in | 96.838 mm 3.813 in | 21.000 mm 0.827 in |
| 387A / 383A | 57.150 mm 2.250 in | 100.000 mm 3.937 in | 21.000 mm 0.827 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 |
|---|---|---|---|
| 387A / 382 | 21.946 mm 0.864 in | 17.826 mm 0.702 in | 252, 313 |
| 387A / 382-S | 21.946 mm 0.864 in | 20.274 mm 0.798 in | 252, 313 |
| 387A / 382A | 21.946 mm 0.864 in | 15.875 mm 0.625 in | 252, 313 |
| 387A / 383A | 21.946 mm 0.864 in | 17.826 mm 0.702 in | 252, 313 |
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.
387 A 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. 25 recorded variants are listed. A dash means the value is missing, not zero.
Catalogue parameters for 387 A
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 387 A — 16 recorded parameters
Single row tapered roller bearing, cone
Reference: SKF product catalogue; source snapshot 2026-09-02.
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 | 57.15 mm |
| Width, total | Not separately recorded | 21.946 mm |
| Width, inner ring | Not separately recorded | 21.946 mm |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating | Not separately recorded | 100.0 kN |
| Basic static load rating | Not separately recorded | 102.0 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 | 1.5 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.406 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) |
|---|---|---|---|---|---|---|
| SKF387 ASingle row tapered roller bearing, cone |
| 100 kN | 102 kN | — | — | 0.406 kg406 g |
| SKF387 A/382 ASingle row tapered roller bearing |
| 100 kN | 102 kN | 5600 rpm | 6700 rpm | 0.576 kg576 g |
| SKF387 A/382 A/VA983Special single row tapered roller bearing |
| 81.6 kN | 93 kN | 5000 rpm | 6700 rpm | 0.598 kg598 g |
| SKF387 A/VA983Special single row tapered roller bearing, cone |
| 81.6 kN | 93 kN | — | — | 0.42 kg420 g |
| TIMKEN387A / 382Tapered roller bearing |
| 108 kN | 107 kN | — | — | 0.64 kg640 g |
| TIMKEN387A / 382ATapered roller bearing |
| 108 kN | 107 kN | — | — | 0.59 kg590 g |
| TIMKEN387A / 382STapered roller bearing |
| 108 kN | 107 kN | — | — | 0.66 kg660 g |
| TIMKEN387A / 383ATapered roller bearing |
| 108 kN | 107 kN | — | — | 0.67 kg670 g |
| TIMKEN387A-90064Tapered roller bearing |
| 108 kN | 107 kN | — | — | 0.64 kg640 g |
| TIMKEN387A-90070Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.42 kg1420 g |
| TIMKEN387A-90178Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.49 kg1490 g |
| TIMKEN387A-90207Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.42 kg1420 g |
| TIMKEN387A-90271Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.49 kg1490 g |
| TIMKEN387A-90279Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.42 kg1420 g |
| TIMKEN387A-90349Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.42 kg1420 g |
| TIMKEN387AS / 382Tapered roller bearing |
| 108 kN | 107 kN | — | — | 0.64 kg640 g |
| TIMKEN387AS / 382ATapered roller bearing |
| 108 kN | 107 kN | — | — | 0.59 kg590 g |
| TIMKEN387AS / 382-STapered roller bearing |
| 108 kN | 107 kN | — | — | 0.66 kg660 g |
| TIMKEN387AS / 383Tapered roller bearing |
| 108 kN | 107 kN | — | — | 0.7 kg700 g |
| TIMKEN387AS / 383ATapered roller bearing |
| 108 kN | 107 kN | — | — | 0.67 kg670 g |
| TIMKEN387AS / 383XTapered roller bearing |
| 108 kN | 107 kN | — | — | 0.76 kg760 g |
| TIMKEN387AS-90073Tapered roller bearing |
| 188 kN | 214 kN | — | — | 1.38 kg1380 g |
| TIMKEN387AS / NP064306Tapered roller bearing |
| 108 kN | 107 kN | — | — | 0.59 kg590 g |
| KOYO387A/382ATapered roller bearing |
| 101 kN | 101 kN | — | 3900 rpmLimiting Speeds(Grease Lub.): 3900 min-1Limiting Speeds(Oil Lub.): 5200 min-1 | 0.603 kg603 g |
| KOYO387AS/382ATapered roller bearing |
| 101 kN | 101 kN | — | 3900 rpmLimiting Speeds(Grease Lub.): 3900 min-1Limiting Speeds(Oil Lub.): 5200 min-1 | 0.599 kg599 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 387 A | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 387 A/382 A | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 387 A/382 A/VA983 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| SKF 387 A/VA983 | Without | Not recorded | Not recorded | Sheet metal | Not recorded | None |
| TIMKEN 387A / 382 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A / 382A | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A / 382S | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A / 383A | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90064 | Open | ABMA Class 0 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90070 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90178 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90207 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90271 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90279 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387A-90349 | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387AS / 382 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 387AS / 382A | Open | ABMA Class 2 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387AS / 382-S | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 387AS / 383 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 387AS / 383A | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 387AS / 383X | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| TIMKEN 387AS-90073 | Open | ABMA Class 0 | Not recorded | Steel cage | Not recorded | Not recorded |
| TIMKEN 387AS / NP064306 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 387A/382A | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| KOYO 387AS/382A | 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.
387 A
Single row tapered roller bearing, cone
View full technical record →TIMKEN387A / 382
Tapered roller bearing
View full technical record →TIMKEN387A / 382A
Tapered roller bearing
View full technical record →KOYO387A/382A
Tapered roller bearing
View full technical record →SKF387 A/382 A
Single row tapered roller bearing
View full technical record →SKF387 A/382 A/VA983
Special single row tapered roller bearing
View full technical record →TIMKEN387A / 382S
Tapered roller bearing
View full technical record →TIMKEN387A / 383A
Tapered roller bearing
View full technical record →TIMKEN387A-90064
Tapered roller bearing
View full technical record →TIMKEN387A-90070
Tapered roller bearing
View full technical record →TIMKEN387A-90178
Tapered roller bearing
View full technical record →TIMKEN387A-90207
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.