NJG309-VH bearing: complete specifications & equivalents
The NJG309-VH is a ISO 15 radial bearing sized 45 x 100 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 100 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 110 kN |
| Basic static load rating C0 | 112 kN |
| Fatigue load limit Pu | 14 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 940 g |
| Manufacturer designation | SKF NJG 309 VH |
| 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 & NJG300-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 0.984 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in NJG300-series | 45 mm |
| Largest outer diameter in NJG300-series | 100 mm |
| Width range across NJG300-series | 25–25 mm |
| Bore position in NJG300-series (smallest first) | 1 of 1 |
| Bore above smallest NJG300-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NJG309 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 NJG309-VH model number is decoded
NJG309-VH is the 45 mm bore entry in the NJG300 range: a 45×100×25 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 110 kN / C0 112 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH 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. Selection arithmetic: C0/C ≈ 1.02 (112 against 110 kN), and the Pu figure 14 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 7,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.
Typical equipment & failure modes
Common applications
- crane travel-wheel bearings
- rolling-mill table rollers
- slew and swing drives
- heavy gearbox output shafts
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
- roller-end scoring from inadequate oil flow in the roller-raceway contact
- edge loading and roller-end scoring when the minimum radial load is not maintained at standstill
- edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)
Selection pitfalls — read before you substitute
- Full-complement bearings trade speed for capacity: the 9,000 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.
- Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.
- Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.
- The 110/112 kN ratings are SKF catalogue 17000 (2018) values for the VH 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 NJG309-VH?
SKF NJG 309 VH is a single-row full-complement cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 110 kN, C0 112 kN, Pu 14 kN, reference speed 7,500 r/min and limiting speed 9,000 r/min, mass about 940 g.
What does the NJG designation and VH suffix mean?
Suffix VH 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 single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling.
Can NJG309-VH take axial load and locate the shaft?
In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution.
How does NJG309-VH 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.