33217T145-DB bearing: complete specifications & equivalents
The 33217T145-DB is a ISO 355 radial bearing sized 85 x 150 x 145 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 85 mm |
| Outer diameter D | 150 mm |
| Width B | 145 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 606 kN |
| Basic static load rating C0 | 850 kN |
| Fatigue load limit Pu | 96.5 kN |
| Reference speed (thermal) | 2800 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 9000 g |
| Manufacturer designation | SKF 33217T145/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 | 3.346 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 5.709 in |
| ISO bore code | 45 |
| Radial section height (D−d)/2 | 32.5 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) | 11 of 30 |
| Bore above smallest matched-db-series size | 50 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 33217T145 | 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 33217T145-DB model number is decoded
Reading the designation: 33217T145 is the ISO 355 single-row base bearing (85 mm bore), and the suffix /DB marks the matched-set execution — arrangement, spacer grinding and factory clearance class. The pair envelope is 85×150×145 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: 33217T145-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 1.40; combined with the 96.5 kN fatigue limit this frames a set sized for reversing combined load on a 85 mm shaft rather than for pure radial duty. Load system: C 606 kN against C0 850 kN gives a 1.40 balance, and 7.13 kN of dynamic capacity per millimetre of the 85 mm bore is the density figure to compare against neighbouring sizes. Spacer discipline: the spacer between the two bearings of 33217T145-DB is ground to the individual set — it carries a serial link to the pair, so never swap spacers between sets of the same designation. Clamp the assembled pair axially through the cones — never through the rollers — and verify the 145 mm overall width against the catalogue value before final torquing of the shaft nut.33217T145-DB is a matched pair of single-row tapered roller bearings arranged back-to-back (O) matched pair, supplied by SKF in SKF catalogue PUB BU/P1 17000 as one factory-set unit: the two bearings, spacers and setting are matched together and must not be mixed with other sets.
Typical equipment & failure modes
Common applications
- paper-machine and printing rolls
- construction machinery drives
- marine deck machinery shafts
- marine deck machinery shafts
Known failure patterns
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- 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
- grease degradation after long shelf storage without rotation or re-greasing
- electrical pitting on VFD-driven shafts without grounding protection
Selection pitfalls — read before you substitute
- Replace 33217T145-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 33217T145-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Clamp the 33217T145-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 606/850 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 33217T145/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 33217T145-DB?
The SKF 33217T145/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 85 mm bore, 150 mm outer diameter and 145 mm overall width (3.346 × 5.906 × 5.709 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 606 kN, C0 850 kN, fatigue load limit Pu 96.5 kN, reference speed 2,800 r/min, limiting speed 4,300 r/min, mass about 9.00 kg.
What does the /DB suffix on 33217T145-DB mean?
The base 33217T145 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 33217T145-DB for one bearing or the pair?
They are for the complete matched pair: C 606 kN dynamic and C0 850 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 33217T145 table values.
Can 33217T145-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 85 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 85 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.