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Double-row cylindrical roller bearing, 105 mm tapered 1:12 bore x 160 mm OD x 41 mm wide, machined brass cage, SP precision class. 1 Pc.
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| MFR / Brand | FAG |
|---|---|
| MPN | NN3021KMSP5 |
| Model | NN3021-KMS P5 |
| Bearing Type | Cylindrical Roller Bearing, Open |
| ID | 105 mm |
| OD | 160 mm |
| Width | 41 mm |
| Material | Chrome Steel |
|---|---|
| Series | NN3000 |
| Condition | New |
| Lubricant | Oil |
| Base Number | NN3021 |
| Industry Terms | double row cylindrical roller bearing, precision spindle bearing, tapered bore roller bearing, machine tool bearing |
| Common Misspellings | NN3021KMSP5, NN 3021KM SP, FAG NN3021 KMSP, NN3021KN.SP |
| Application Types | machine tool spindles, lathe headstocks, grinding spindles, gearboxes |
| Bore Shaft Size | 105 mm (4.1339 in), tapered 1:12 |
| Mpn Variants | NN3021KM.SP, NN-3021-KM-SP, NN3021K.M.SP, NN 3021 K M SP, NN3021KMSP, NN3021-AS-K-M-SP |
| Arrangement Configuration | Non-locating, radial load only |
| Precision Class | SP |
| Min Temp | -30 °C |
| Cage Type | Machined Brass |
| Dynamic Load Rating | 190 kN |
| Static Load Rating | 300 kN |
| Precision Rating | ABEC 5 / P5 |
| Rolling Elements | Cylindrical Roller |
| Max Temp | 150 °C |
| Item Weight | 6.80 lbs |
| Cage Material | Machined brass |
| Number Of Rows | 2 |
| Bore Type | Tapered Bore |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.50.00.00 |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Internal Clearance | CN |
| Part Number | NN3021KM.SP |
| Cross Reference 1 | SKF NN 3021 KTN9/SP |
|---|---|
| Cross Reference 2 | NSK NN3021KCC1P5 |
| Cross Reference 3 | NTN NN3021KC1NAP5 |
FAG NN3021-K-M-SP, a double-row cylindrical roller bearing with a tapered 1:12 bore. Two rows of cylindrical rollers run between a one-piece outer ring and a one-piece inner ring. Boundary dimensions 105 mm bore × 160 mm outside diameter × 41 mm width.
Series NN30 is the double-row cylindrical roller line in ISO dimension series 30. Bore Code: 21, giving a 105 mm bore. Bore Type: K, 1:12 tapered bore. Cage Material: M, machined brass. Precision Class: SP, FAG special precision class, dimensional tolerance to P5 with tightened running accuracy.
Two rows of cylindrical rollers give very high radial capacity and radial stiffness in a short width, which is why this type carries the front position on machine-tool spindles. The design is non-locating: it takes radial load only, and axial location comes from a separate thrust or angular contact bearing elsewhere on the shaft. On an NN the 1:12 tapered bore mounts directly on a matching tapered spindle journal, with no adapter sleeve involved, and the drive-up distance along the taper sets the radial internal clearance after mounting. A machined brass cage handles higher speed and temperature than a pressed cage.
Bore: 105 mm (4.1339 in), tapered 1:12. Outside Diameter: 160 mm (6.2992 in). Overall Width: 41 mm (1.6142 in). Number Of Rows: 2. Rolling Elements: cylindrical rollers. Cage: machined brass (M). Precision Class: SP. Arrangement: non-locating. Closure Type: open. Bearing Material: chrome bearing steel.
1 Pc. Bearing only, mounted directly on a tapered journal.
Radial internal clearance is set on assembly by how far the inner ring is driven up the 1:12 taper, measured as the reduction in clearance rather than as an axial dimension. The outer ring carries no axial load, so it sits in the housing free to float unless a locating bearing constrains the shaft elsewhere. Both rings are one piece, so the roller set and inner ring separate from the outer for mounting.
Current Schaeffler naming for the same bearing is NN3021-AS-K-M-SP. Same-spec tapered-bore SP-class equivalents in other schemes: SKF NN 3021 KTN9/SP, NSK NN3021KCC1P5, NTN NN3021KC1NAP5. Straight-bore NN3021 forms, and the NNU double-row series with its different roller and rib arrangement, are related sizes rather than interchanges.
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