32938T102-DB bearing: complete specifications & equivalents
The 32938T102-DB is a ISO 355 radial bearing sized 190 x 260 x 102 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 190 mm |
| Outer diameter D | 260 mm |
| Width B | 102 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 760 kN |
| Basic static load rating C0 | 1530 kN |
| Fatigue load limit Pu | 143 kN |
| Reference speed (thermal) | 1400 rpm |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 15000 g |
| Manufacturer designation | SKF 32938T102/DB |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & matched-db-series range
| Bore d | 7.48 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 4.016 in |
| ISO bore code | 02 |
| Radial section height (D−d)/2 | 35 mm |
| Smallest bore in matched-db-series | 35 mm |
| Largest outer diameter in matched-db-series | 480 mm |
| Width range across matched-db-series | 41.5–288 mm |
| Bore position in matched-db-series (smallest first) | 24 of 30 |
| Bore above smallest matched-db-series size | 155 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32938T102 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 32938T102-DB model number is decoded
Reading the designation: 32938T102 is the ISO 355 single-row base bearing (190 mm bore), and the suffix /DB marks the matched-set execution — arrangement, spacer grinding and factory clearance class. The pair envelope is 190×260×102 mm; the width covers both bearings of the set. In the back-to-back (O) arrangement the load lines diverge toward the shaft axis, giving the pair a wide effective spread: 32938T102-DB resists overturning moments and tilting loads stiffly, which is why O-sets are preferred for gearbox output shafts and pinion supports. The C0/C balance of the pair is about 2.01; combined with the 143 kN fatigue limit this frames a set sized for reversing combined load on a 190 mm shaft rather than for pure radial duty. Cross-section geometry: the 35.0 mm half-section ((260−190)/2) places the roller pitch diameter near 225 mm, and the 102 mm axial width sets the abutment depth — geometry that fixes the contact angle behaviour of 32938T102-DB. Inspection shorthand: at overhaul, mark both bearings and the spacer of 32938T102-DB before disassembly — the set is a matched system, and re-assembling with one component reversed changes the factory setting. Clamp the assembled pair axially through the cones — never through the rollers — and verify the 102 mm overall width against the catalogue value before final torquing of the shaft nut.For a 190 mm shaft carrying reversing axial load, SKF lists 32938T102-DB under catalogue execution SKF 32938T102/DB: a factory-matched back-to-back (O) matched pair tapered-roller pair, set and measured as one unit.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- large industrial mixer shafts
Known failure patterns
- false brinelling on idle paired sets exposed to machine vibration
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- brinelling from pressing the cone or cup home through the rollers
- hard-particle indentation of the tapered raceway in unfiltered oil
Selection pitfalls — read before you substitute
- O and X arrangements are not interchangeable by turning the set around: 32938T102-DB in back-to-back (O) matched pair arrangement has its load-line geometry fixed — specify the arrangement from the shaft thermal and stiffness analysis.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 32938T102-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- A matched /DB set is ground as one system: never separate the two bearings of 32938T102-DB or swap the spacer — the factory clearance is lost the moment the set is broken.
- The 760/1530 kN ratings are SKF catalogue 17000 values for this execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification.
- Quote the full SKF 32938T102/DB designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 32938T102-DB?
The SKF 32938T102/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 190 mm bore, 260 mm outer diameter and 102 mm overall width (7.48 × 10.236 × 4.016 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 760 kN, C0 1530 kN, fatigue load limit Pu 143 kN, reference speed 1,400 r/min, limiting speed 2,200 r/min, mass about 15.00 kg.
What does the /DB suffix on 32938T102-DB mean?
The base 32938T102 is the ISO 355 single-row bearing; the /DB suffix marks the matched-set execution — the arrangement (back-to-back (O)), the ground spacer and the factory-set axial clearance class. A matched set cannot be assembled from loose single bearings; quote the full designation when ordering.
Are the C and C0 ratings of 32938T102-DB for one bearing or the pair?
They are for the complete matched pair: C 760 kN dynamic and C0 1530 kN static already include load sharing between the two bearings. Do not halve them for single-bearing checks, and do not compare them directly with the single-row 32938T102 table values.
Can 32938T102-DB be adjusted like two loose tapered bearings?
No — the axial clearance is set at the factory by selective spacer grinding. Mounting work is limited to clean seats, correct fits (m6 on a rotating 190 mm shaft) and axial clamping through the cones; re-setting in the field destroys the matched clearance class.
When should a back-to-back (O) matched set be chosen?
Choose the back-to-back (O) set where moment stiffness dominates — pinion supports, gearbox output shafts, crane sheaves. The diverging load lines give the widest effective spread at the 190 mm bore.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants on 2026-09-29. Read our editorial & correction policy.