C3038-K-H3038 bearing: complete specifications & equivalents
The C3038-K-H3038 is a ISO 15 radial bearing sized 170 x 290 x 75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 170 mm |
| Outer diameter D | 290 mm |
| Width B | 75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 930 kN |
| Basic static load rating C0 | 1460 kN |
| Fatigue load limit Pu | 132 kN |
| Reference speed (thermal) | 1800 rpm |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 24000 g |
| Manufacturer designation | SKF C 3038 K + H 3038 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves); 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 & carb-adapter-sleeve range
| Bore d | 6.693 in |
|---|---|
| Outer diameter D | 11.417 in |
| Width B | 2.953 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 60 mm |
| Smallest bore in carb-adapter-sleeve | 25 mm |
| Largest outer diameter in carb-adapter-sleeve | 1580 mm |
| Width range across carb-adapter-sleeve | 20–462 mm |
| Bore position in carb-adapter-sleeve (smallest first) | 23 of 51 |
| Bore above smallest carb-adapter-sleeve size | 145 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| C3038 | 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 C3038-K-H3038 model number is decoded
Spare-parts note: order C3038-K-H3038 as the unit; a bare C 3038 K plus a separately sourced sleeve risks taper mismatch — the catalogue pairing is the guarantee that seat and bore were ground for each other.In SKF catalogue PUB BU/P1 17000, C3038-K-H3038 appears as bearing C 3038 K + adapter sleeve H 3038: the non-locating CARB principle combined with a tapered-bore sleeve seat for a 170 mm shaft.Digit by digit, C3038-K-H3038 = CARB bearing C 3038 K (190 mm bore, 290 mm OD, 75 mm width) + adapter sleeve H 3038 for the 170 mm cylindrical shaft seat; cage and tolerance letters stay with the bearing half of the designation. The H 3038 execution mounts the 190 mm K-bore bearing with a controlled squeeze on the 170 mm shaft: the sleeve cone sets both the interference fit on the shaft and the running clearance inside the CARB bearing, so clearance measurement belongs to the mounting procedure, not to fitting feel. Selection arithmetic: the unit carries the ratings of its bearing — C 930 kN, C0 1460 kN, Pu 132 kN from the CARB table — because the sleeve adds no capacity, only the mounting interface on the 170 mm shaft. The locknut torque of H 3038 sets the sleeve travel; use the SKF procedure (measure clearance reduction, not torque feel) — over-driving the sleeve preloads the 190 mm CARB bearing and overheats the unit within hours.
Typical equipment & failure modes
Common applications
- paper machine drying cylinders and calender rolls with long, thermally expanding shafts
- continuous-caster guide rolls and slab-caster segments under heat growth
- vibrating screen exciters fitted with the VE240 tolerance execution
- heavy industrial gearbox layshafts used as the non-locating position
Known failure patterns
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- fretting corrosion at the shaft-sleeve interface under vibration with an undersized seat
- sleeve creep on the shaft seat when the sleeve was not driven to its marked travel or clearance
- overheating from a preload set at mounting when sleeve travel overshot the catalogue clearance
- raceway spalling of the CARB bearing after the catalogue L10 life under contaminated lubrication
Selection pitfalls — read before you substitute
- Protect the 170 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3038-K-H3038.
- Protect the 170 mm seat: sleeve bore corrosion or seat ovality shows up later as sleeve creep and fretting; inspect and measure the seat at every dismounting of C3038-K-H3038.
- Sleeve and bearing are a matched taper pair: never fit sleeve H 3038 onto a different CARB bearing of the same bore size without verifying the execution letters — seat length and taper contact differ.
- The 930/1460 kN ratings are SKF catalogue 17000 values for the CARB bearing; 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 unit designation SKF C 3038 K + H 3038 when purchasing — bearing and sleeve execution letters are part of the order number and define the matched taper pair.
Frequently asked questions
What are the dimensions and catalogue data of C3038-K-H3038?
The unit is CARB bearing C 3038 K on adapter sleeve H 3038, fitting a 170 mm shaft (6.693 in), housing bore 290 mm, bearing width 75 mm. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 930 kN, C0 1460 kN, fatigue load limit Pu 132 kN, combined mass about 24.0 kg. Reference speed 1,800 r/min, limiting speed 2,400 r/min (bearing values).
Why does C3038-K-H3038 list a 170 mm shaft size when the bearing bore is 190 mm?
The sleeve takes up the difference: the adapter sleeve H 3038 has a tapered outside that engages the bearing's 190 mm tapered bore and a cylindrical bore that seats on the 170 mm shaft. The catalogue's principal dimensions describe the mounted result — shaft seat, housing bore and bearing width — not the bearing bore alone.
Is C3038-K-H3038 a locating or non-locating bearing?
Non-locating. The CARB toroidal roller bearing is designed as the free end of the shaft: its raceway geometry tolerates misalignment and allows axial float, while a separate locating bearing (typically a spherical roller or paired taper) takes the thrust. The sleeve does not change this function.
Can I buy the bearing C 3038 K and the sleeve H 3038 separately?
The components are catalogued separately, but the taper pair is matched — the sleeve seat and the bearing bore are manufactured to the same execution. Ordering the unit C3038-K-H3038 as one catalogue line keeps bearing and sleeve compatible; if ordering separately, quote both full designations including execution letters.
How is the clearance of C3038-K-H3038 set at mounting?
By driving the adapter sleeve up its conical seat: the sleeve expands on the 170 mm shaft and onto the bearing bore, reducing the radial internal clearance. Mount in steps and measure residual clearance until it reaches the catalogue value for the K bore — never set it by nut torque alone.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 10.2-10.3 CARB on sleeves on 2026-09-29. Read our editorial & correction policy.