3920 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with 3920. 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.
TIMKEN 3920 — bearing pairs and set identification
For TIMKEN 3920, the component number alone does not establish every dimension of a complete bearing. This reference identifies documented cone/cup combinations that contain 3920; 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 |
|---|---|---|---|
| 3975 / 3920 | 50.800 mm 2.000 in | 112.712 mm 4.438 in | 30.162 mm 1.188 in |
| 3979 / 3920 | 57.150 mm 2.250 in | 112.712 mm 4.438 in | 30.162 mm 1.188 in |
| 3977 / 3920 | 60.000 mm 2.362 in | 112.712 mm 4.438 in | 30.162 mm 1.188 in |
| 3980 / 3920 | 60.325 mm 2.375 in | 112.712 mm 4.438 in | 30.162 mm 1.188 in |
| 3982 / 3920 | 63.500 mm 2.500 in | 112.712 mm 4.438 in | 30.162 mm 1.188 in |
| 3992 / 3920 | 66.675 mm 2.625 in | 112.712 mm 4.438 in | 29.337 mm 1.155 in |
| 3984 / 3920 | 66.675 mm 2.625 in | 112.712 mm 4.438 in | 30.162 mm 1.188 in |
| 3994 / 3920 | 66.675 mm 2.625 in | 112.712 mm 4.438 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 |
|---|---|---|---|
| 3975 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 245, 339 |
| 3979 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 253, 339 |
| 3977 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 255, 339 |
| 3980 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 255, 339 |
| 3982 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 258, 340 |
| 3992 / 3920 | 29.223 mm 1.151 in | 23.812 mm 0.938 in | 260, 340 |
| 3984 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 260, 340 |
| 3994 / 3920 | 30.048 mm 1.183 in | 23.812 mm 0.938 in | 260, 340 |
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.
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.