NCF28-670-V bearing: complete specifications & equivalents
The NCF28-670-V is a ISO 15 radial bearing sized 670 x 820 x 88 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 670 mm |
| Outer diameter D | 820 mm |
| Width B | 88 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 1940 kN |
| Basic static load rating C0 | 5300 kN |
| Fatigue load limit Pu | 415 kN |
| Reference speed (thermal) | 280 rpm |
| Limiting speed (mechanical) | 340 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 98000 g |
| Manufacturer designation | SKF NCF 28/670 V |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-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. 6.3 single-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 & NCF2800-series range
| Bore d | 26.378 in |
|---|---|
| Outer diameter D | 32.283 in |
| Width B | 3.465 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 75 mm |
| Smallest bore in NCF2800-series | 440 mm |
| Largest outer diameter in NCF2800-series | 1150 mm |
| Width range across NCF2800-series | 60–118 mm |
| Bore position in NCF2800-series (smallest first) | 9 of 15 |
| Bore above smallest NCF2800-series size | 230 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the NCF28-670-V model number is decoded
For a 670 mm shaft, SKF lists NCF28-670-V as single-row full-complement cylindrical roller: 820 mm OD, 88 mm wide, Pu 415 kN, the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V 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. Load-per-bore for the 670 mm seat is about 2.90 kN/mm, typical of dimension series 28 (slim section, wide); use C0 5300 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 670 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.
Typical equipment & failure modes
Common applications
- large rolling-mill and continuous-caster drives
- mining crusher eccentric shafts
- heavy offshore winch drums
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 (microwelding) in the full complement during skidding at light load or rapid acceleration
- polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant
- surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load
- edge loading and roller-end scoring when the minimum radial load is not maintained at standstill
- smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load
Selection pitfalls — read before you substitute
- Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.
- Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.
- Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.
- Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.
- The 1940/5300 kN ratings are SKF catalogue 17000 (2018) values for the V 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 NCF28-670-V?
SKF NCF 28/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 820 mm OD and 88 mm width per ISO 15. SKF lists C 1940 kN, C0 5300 kN, Pu 415 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 98000 g.
What does the NCF designation and V suffix mean?
Suffix V 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 non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together.
Can NCF28-670-V take axial load and locate the shaft?
In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded.
How does NCF28-670-V compare with the other executions in the same envelope?
The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings.
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. 6.3 single-row full complement cylindrical roller bearings on 2026-09-26. Read our editorial & correction policy.