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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Availability:
1 in stock
Double row cylindrical roller bearing, 280 x 380 x 100 mm, 1:12 tapered bore, ISO P4 precision. NN49 super-precision spindle series with CC9 radial clearance.
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| MFR / Brand | NSK |
|---|---|
| MPN | NN4956KCC9P4 |
| Model | NN 4956 K CC9 P4 |
| Bearing Type | Cylindrical Roller Bearing, Open |
| ID | 280 mm |
| OD | 380 mm |
| Width | 100 mm |
| Series | NN4900 |
|---|---|
| Material | Bearing Steel |
| Mpn Variants | NN4956KCC9P4, NN4956K, NN-4956-K-CC9-P4, NN 4956 K CC9 P4 |
| Precision Class | ISO P4 |
| Rolling Elements | Cylindrical Roller |
| Number Of Rows | 2 |
| Bore Type | Tapered 1:12 |
| Snap Ring Included | No |
| Internal Clearance | CC9 |
| Harmonization Code | 8482.50.00 |
| Industry Terms | NN49 double row cylindrical roller bearing; tapered bore spindle bearing; double row cylindrical roller spindle bearing |
| Common Misspellings | NN 4956K; NSK NN4956 KCC9P4; NN4956K CC9 P4 |
| Application Types | Machine tool spindles; precision spindles; high radial load applications |
| Cross Reference 1 | NTN NN4956 (straight bore, not tapered) |
|---|
NSK NN4956KCC9P4 double row cylindrical roller bearing from the NN49 super-precision series for machine tool spindles. Bore 280 mm, outside diameter 380 mm, width 100 mm. Tapered 1:12 bore, open design, ISO P4 precision, CC9 radial clearance. One complete bearing: inner ring with roller sets and outer ring (Unit Quantity: 1 Pc).
NN — double row cylindrical roller bearing with the guide ribs on the inner ring; the outer ring is a separable plain sleeve.
49 — dimension series 49, the thin cross-section spindle series.
56 — bore code, 56 x 5 = 280 mm.
K — 1:12 tapered bore.
CC9 — NSK radial internal clearance code for tapered-bore precision cylindrical roller bearings.
P4 — ISO tolerance class 4, the super-precision grade.
Bore Diameter: 280 mm. Outside Diameter: 380 mm. Overall Width: 100 mm. Number Of Rows: 2. Rolling Elements: Cylindrical Roller. Bore Type: Tapered 1:12. Internal Clearance: CC9. Precision Class: ISO P4. Closure Type: Open. Series: NN4900. Unit Quantity: 1 Pc. Harmonization Code: 8482.50.00.
The tapered 1:12 bore mounts directly on a tapered spindle journal. The NN design carries radial load; the ribs are on the inner ring and the outer ring is a plain separable sleeve.
Cross-Reference 1: NTN NN4956 (straight bore, not tapered). The NNU4956 places the ribs on the outer ring and is a different design.
Bore 280 mm, outside diameter 380 mm, width 100 mm.
K is the 1:12 tapered bore.
NN is a double row cylindrical roller bearing with the guide ribs on the inner ring and a separable plain outer ring.
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