NNCL4934-CV bearing: complete specifications & equivalents
The NNCL4934-CV is a ISO 15 radial bearing sized 170 x 230 x 60 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 | 230 mm |
| Width B | 60 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 457 kN |
| Basic static load rating C0 | 950 kN |
| Fatigue load limit Pu | 100 kN |
| Reference speed (thermal) | 1200 rpm |
| Limiting speed (mechanical) | 1500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7100 g |
| Manufacturer designation | SKF NNCL 4934 CV |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings); 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 & NNCL4900-series range
| Bore d | 6.693 in |
|---|---|
| Outer diameter D | 9.055 in |
| Width B | 2.362 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 30 mm |
| Smallest bore in NNCL4900-series | 60 mm |
| Largest outer diameter in NNCL4900-series | 540 mm |
| Width range across NNCL4900-series | 25–140 mm |
| Bore position in NNCL4900-series (smallest first) | 12 of 25 |
| Bore above smallest NNCL4900-series size | 110 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NNC4934-CV | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical. |
| NNCF4934-CV | SKF | full Dimensions and internal design equivalent — standard interchange. | Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical. |
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 NNCL4934-CV model number is decoded
SKF NNCL 4934 CV is a double-row full-complement cylindrical roller bearing sized 170×230×60 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 457 kN and C0 950 kN, size the bearing on the 170×230 mm ISO 15 envelope and check the 100 kN Pu against the equivalent-load floor; the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.
Typical equipment & failure modes
Common applications
- mining shovel and dragline pivots
- steelmaking and heavy crane sheaves
- large offshore winch and hook blocks
Known failure patterns
- inner-ring raceway spalling from overload or contamination in the line-contact hertz zone
- outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating
- roller smearing between the uncaged rollers during slow skidding starts under heavy static load
- cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up
- roller-end scoring from inadequate oil flow in the roller-raceway contact
- uneven row loading from misalignment, concentrating fatigue on one row of the double complement
- brinelling from static overload or impact during handling and mounting
Selection pitfalls — read before you substitute
- The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.
- Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.
- Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
- Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.
- The 457/950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification.
Frequently asked questions
What are the dimensions and catalogue data of NNCL4934-CV?
SKF NNCL 4934 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 60 mm width per ISO 15. SKF lists C 457 kN, C0 950 kN, Pu 100 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 7100 g.
What does the NNCL designation and CV suffix mean?
Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set.
Can NNCL4934-CV take axial load and locate the shaft?
No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement.
How does NNCL4934-CV compare with the other executions in the same envelope?
NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement.
What limits the service life of this bearing most often?
On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings on 2026-09-26. Read our editorial & correction policy.