NU3196-ECMA-HB1 bearing: complete specifications & equivalents
The NU3196-ECMA-HB1 is a ISO 15 radial bearing sized 480 x 790 x 248 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 480 mm |
| Outer diameter D | 790 mm |
| Width B | 248 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | brass |
| Basic dynamic load rating C | 5940 kN |
| Basic static load rating C0 | 10800 kN |
| Fatigue load limit Pu | 800 kN |
| Reference speed (thermal) | 630 rpm |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 507000 g |
| Manufacturer designation | SKF NU 3196 ECMA/HB1 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row 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. 6.1 single-row 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 & NU3100-series range
| Bore d | 18.898 in |
|---|---|
| Outer diameter D | 31.102 in |
| Width B | 9.764 in |
| ISO bore code | 96 |
| Radial section height (D−d)/2 | 155 mm |
| Smallest bore in NU3100-series | 280 mm |
| Largest outer diameter in NU3100-series | 870 mm |
| Width range across NU3100-series | 146–272 mm |
| Bore position in NU3100-series (smallest first) | 7 of 9 |
| Bore above smallest NU3100-series size | 200 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the NU3196-ECMA-HB1 model number is decoded
NU3196-ECMA-HB1 is the 480 mm bore entry in the NU3100 range: a 480×790×248 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 5940 kN / C0 10800 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMA/HB1: the basic execution supplied with a standard pressed-steel cage. With C 5940 kN and C0 10800 kN, size the bearing on the 480×790 mm ISO 15 envelope and check the 800 kN Pu against the equivalent-load floor; the catalogue lists 630 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.
Typical equipment & failure modes
Common applications
- heavy turbogenerator rotor supports
- mining hoist and winder shafts
- offshore drawworks shafts
- large rolling-mill drive trains
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
- cage pocket wear from roller skew at light load
- 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 fatigue after shaft deflection beyond the 3–4 minute alignment limit
- hard-particle indentation of the raceway in unfiltered oil systems
Selection pitfalls — read before you substitute
- Do not use a NU bearing where axial load must be carried — the design carries radial load only
- The dimension series 31 (compact OD, wide) envelope is shared with the N/NU/NJ/NUP executions of 3196, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 3196 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.
- Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 790 mm raceway.
- Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.
- The 5940/10800 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 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 NU3196-ECMA-HB1?
SKF NU 3196 ECMA/HB1 is a single-row caged cylindrical roller bearing with 480 mm bore, 790 mm OD and 248 mm width per ISO 15. SKF lists C 5940 kN, C0 10800 kN, Pu 800 kN, reference speed 630 r/min and limiting speed 1,100 r/min, mass about 507000 g.
What does the NU designation and ECMA/HB1 suffix mean?
The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable.
Can NU3196-ECMA-HB1 take axial load and locate the shaft?
No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty.
How does NU3196-ECMA-HB1 compare with the other executions in the same envelope?
The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number.
What limits the service life of this bearing most often?
Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings on 2026-09-26. Read our editorial & correction policy.