32228T158-DB bearing: complete specifications & equivalents
The 32228T158-DB is a ISO 355 radial bearing sized 140 x 250 x 158 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 140 mm |
| Outer diameter D | 250 mm |
| Width B | 158 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1185 kN |
| Basic static load rating C0 | 2000 kN |
| Fatigue load limit Pu | 200 kN |
| Reference speed (thermal) | 1500 rpm |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 30000 g |
| Manufacturer designation | SKF 32228T158/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 | 5.512 in |
|---|---|
| Outer diameter D | 9.843 in |
| Width B | 6.22 in |
| ISO bore code | 58 |
| Radial section height (D−d)/2 | 55 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) | 19 of 30 |
| Bore above smallest matched-db-series size | 105 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32228T158 | 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 32228T158-DB model number is decoded
SKF 32228T158/DB belongs to the SKF matched tapered-roller range — the 140 mm bore entry in back-to-back (O) matched pair arrangement, dimensioned 250 mm OD and 158 mm overall width for the pair.The code breaks down as base bearing 32228T158 plus matched-set suffix /DB: two bearings of the 140 mm bore size, paired back-to-back (O) matched pair, with the 158 mm overall width spanning the whole arrangement. In the back-to-back (O) arrangement the load lines diverge toward the shaft axis, giving the pair a wide effective spread: 32228T158-DB resists overturning moments and tilting loads stiffly, which is why O-sets are preferred for gearbox output shafts and pinion supports. Dividing the pair C 1185 kN by the 140 mm bore gives 8.46 kN per millimetre of journal for the complete arrangement — a density metric that compares matched sets across the back-to-back (O) matched pair family. Operating context for the 140 mm bore: a shaft of this diameter typically runs in the xl-bore band of industrial duty, and the 250 mm OD places the housing shoulder near 258 mm outer abutment. Load sharing in 32228T158-DB depends on spacer face parallelism; a cocked spacer concentrates the reversing thrust on one bearing of the pair and shows up as asymmetric raceway wear at overhaul. A matched /DB set needs no setting adjustment at mounting: the clearance is built in; the assembler's job is clean seats, correct fits (m6 on a 140 mm rotating shaft) and square abutments.
Typical equipment & failure modes
Common applications
- wind-turbine main shafts
- marine propulsion gearboxes
- large industrial mixer shafts
- wind-turbine main shafts
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- pressed-steel cage wear or fracture after prolonged running above the limiting speed
- mounting score marks when the cone is cocked over the shaft keyway or a burr
- mounting score marks when the cone is cocked over the shaft keyway or a burr
Selection pitfalls — read before you substitute
- A matched /DB set is ground as one system: never separate the two bearings of 32228T158-DB or swap the spacer — the factory clearance is lost the moment the set is broken.
- Setting is built into 32228T158-DB; the classic field error is re-adjusting a matched pair as if it were two loose single bearings, which destroys the /DB clearance class.
- Replace 32228T158-DB as a complete set: pairing a new bearing with a worn partner leaves the clearance undefined even when the designation matches.
- The 1185/2000 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 32228T158/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 32228T158-DB?
The SKF 32228T158/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 140 mm bore, 250 mm outer diameter and 158 mm overall width (5.512 × 9.843 × 6.22 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1185 kN, C0 2000 kN, fatigue load limit Pu 200 kN, reference speed 1,500 r/min, limiting speed 2,600 r/min, mass about 30.00 kg.
What does the /DB suffix on 32228T158-DB mean?
The base 32228T158 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 32228T158-DB for one bearing or the pair?
They are for the complete matched pair: C 1185 kN dynamic and C0 2000 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 32228T158 table values.
Can 32228T158-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 140 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 140 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.