33014T108-8-DB bearing: complete specifications & equivalents
The 33014T108-8-DB is a ISO 355 radial bearing sized 70 x 110 x 108.8 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 70 mm |
| Outer diameter D | 110 mm |
| Width B | 108.8 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 273 kN |
| Basic static load rating C0 | 400 kN |
| Fatigue load limit Pu | 45.5 kN |
| Reference speed (thermal) | 3800 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3050 g |
| Manufacturer designation | SKF 33014T108.8/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 | 2.756 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 4.283 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 20 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) | 8 of 30 |
| Bore above smallest matched-db-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33014T108 | 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 33014T108-8-DB model number is decoded
SKF 33014T108.8/DB belongs to the SKF matched tapered-roller range — the 70 mm bore entry in back-to-back (O) matched pair arrangement, dimensioned 110 mm OD and 108.8 mm overall width for the pair.Numbering ties the set to its envelope: base 33014T108.8 fixes the 70 mm bore and 110 mm OD of each bearing, the /DB suffix fixes the arrangement and setting, and the catalogue 108.8 mm width is the combined pair dimension. In the back-to-back (O) arrangement the load lines diverge toward the shaft axis, giving the pair a wide effective spread: 33014T108-8-DB resists overturning moments and tilting loads stiffly, which is why O-sets are preferred for gearbox output shafts and pinion supports. Selection arithmetic: the catalogue C 273 kN and C0 400 kN are ratings of the complete pair, not of one bearing — never halve them back to a single-row figure when checking L10 life, and use the pair Pu 45.5 kN as the fatigue floor. Dimensional interchange map: within its boundary plan the 70×110×108.8 mm envelope of 33014T108-8-DB is fixed, so shoulder, spacer and seal drawings can be dimensioned straight from the catalogue table. Load sharing in 33014T108-8-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. The rotating cones of 33014T108-8-DB take a k5 seat on the 70 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.
Typical equipment & failure modes
Common applications
- marine deck machinery shafts
- heavy industrial gearboxes and speed reducers
- large process pump and compressor shafts
- marine deck machinery shafts
Known failure patterns
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- 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
- hard-particle indentation of the tapered raceway in unfiltered oil
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- Replace 33014T108-8-DB as a complete set: pairing a new bearing with a worn partner leaves the clearance undefined even when the designation matches.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 33014T108-8-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Clamp the 33014T108-8-DB pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- The 273/400 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 33014T108.8/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 33014T108-8-DB?
The SKF 33014T108.8/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 70 mm bore, 110 mm outer diameter and 108.8 mm overall width (2.756 × 4.331 × 4.283 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 273 kN, C0 400 kN, fatigue load limit Pu 45.5 kN, reference speed 3,800 r/min, limiting speed 5,600 r/min, mass about 3.05 kg.
What does the /DB suffix on 33014T108-8-DB mean?
The base 33014T108.8 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 33014T108-8-DB for one bearing or the pair?
They are for the complete matched pair: C 273 kN dynamic and C0 400 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 33014T108.8 table values.
Can 33014T108-8-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 (k5 on a rotating 70 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 70 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.