Exact model answerHM88649 / HM88610: cone, cup and complete bearing dimensions
TIMKEN HM88649 / HM88610 identifies the cone HM88649 and cup HM88610 in the manufacturer record. The matched pair has bore d = 34.925 mm, outside diameter D = 72.233 mm and assembled width T = 25.400 mm. These are measurements for that complete cone-and-cup combination.
Do not confuse the assembled width with a separate ring: cone width B is 25.400 mm, while cup width C is 19.842 mm. Read T directly from the matched-pair record; adding B and C does not give the assembled width.
- Record marking
- HM88649 / HM88610
- Cone / inner assembly
- HM88649
- Cup / outer ring
- HM88610
Read each measurement separately
Bearing dimensions · published units retained| Measurement | Symbol | Metric | Inches |
|---|
| Bore (d) | d | 34.925 mm | 1 3/8 in |
|---|
| O.D. (D) | D | 72.233 mm | 2.8438 in |
|---|
| Width (T) | T | 25.400 mm | 1.0000 in |
|---|
| Inner Ring Width (B) | B | 25.400 mm | 1.0000 in |
|---|
| Outer Ring Width (C) | C | 19.842 mm | 0.7812 in |
|---|
| Effective Center Location | Not specified | -4.6 mm | -0.18 in |
|---|
Mounting measurements and source limitations
Mounting dimensions · published units retained| Measurement | Symbol | Metric | Inches |
|---|
| Max Shaft Fillet Radius | Not specified | 2.29 mm | 0.09 in |
|---|
| Max Housing Fillet Radius | Not specified | 2.29 mm | 0.090 in |
|---|
| Shaft Backing Shoulder Dia. - Frontface (da) | da | 42.5 mm | 1.68 in |
|---|
| Shaft Backing Shoulder Dia. - Backface (db) | db | 48.5 mm | 1.91 in |
|---|
| Housing Backing Shoulder Dia. - Frontface (Da) | Da | Withheld — source units disagree | Withheld — verify current drawing |
|---|
| Housing Backing Shoulder Dia. - Backface (Db) | Db | 59.94 mm | 2.36 in |
|---|
| Cage Location rel. to BF (Aa) | Aa | 1 mm | 0.04 in |
|---|
| Cage Location rel. to FF (Ab) | Ab | 2.5 mm | 0.1 in |
|---|
What to check on your bearing
- Read the complete cone and cup markings. This record requires HM88649 together with HM88610; a similar-looking suffix or an extra prefix must be checked separately.
- For size identification, distinguish the shaft-side bore d, housing-side diameter D and assembled width T. For an unassembled ring, compare B or C with the corresponding row instead.
- Check the named front/back face before using a shoulder diameter or cage offset. Minimum and maximum qualifiers remain part of the measurement.
- Use the equipment procedure and the exact bearing specification to determine fits, adjustment, lubrication and operating limits. These nominal dimensions do not supply preload, end play or tightening torque.
Some optional mounting entries have metric and inch figures that do not reconcile at their displayed precision: Housing Backing Shoulder Dia. - Frontface (Da). Both numeric versions are withheld in this supplement. Verify the current manufacturer drawing before using those particular limits.
This is a dated dimensional reference, not a replacement approval or a manufacturer-certified drawing. Similar dimensions do not establish matching geometry, load capability, clearance, material or operating limits.
Factual reference: Timken component-identity feed and official dimensional catalogue; catalogue snapshot 2026-10-02. Interpretation and checking notes by BearingScope.
Technical documents & data sheet
This product page is a BearingScope catalogue reference, not a manufacturer-certified drawing. Preserve the full brand and designation when comparing files.
- Record identity
- TIMKEN HM88649 / HM88610
- Document matching
- Exact designation, assembly scope, revision and units must agree.
No verified redistributable CAD or manufacturer PDF is registered for this exact model. A catalogue image is not a dimensioned drawing. Missing technical files are not generated or replaced with unrelated models.
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