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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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1 in stock
Double row cylindrical roller bearing, 105x160x41 mm, 1:12 tapered bore, machined brass cage, ABEC 7 / P4 super-precision spindle bearing.
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$114.72
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| MFR / Brand | NSK |
|---|---|
| MPN | NN3021KMBP4 |
| Model | NN 3021 K MB P4 |
| Bearing Type | Cylindrical Roller Bearing, Open |
| ID | 105 mm |
| OD | 160 mm |
| Width | 41 mm |
| Material | Bearing Steel |
|---|---|
| Series | NN30 double row cylindrical roller |
| Bore | Taper Bore |
| Base Number | NN3021 |
| Industry Terms | Double row cylindrical roller bearing; precision spindle bearing; tapered bore roller bearing; machine tool bearing |
| Common Misspellings | NN302KMBP4; NN 3021KMB P4; NN3012KMBP4; NN3021KMB-P4 |
| Application Types | Machine tool spindles; lathe and milling headstocks; grinding machines; heavy radial precision shafting |
| Overall Width | 41 mm |
| Mpn Variants | NN3021KMBP4; NN3021 K MB P4; NN-3021-K-MB-P4; NN3021MBKP4; NN3021K |
| Precision Class | ABEC 7 / P4 |
| Additional Attributes | da min 114 mm; Da 148-151 mm; r min 2 mm; ra max 2 mm |
| Cage Type | Machined |
| Dynamic Load Rating | 243,000 N |
| Static Load Rating | 320,000 N |
| Rolling Elements | Cylindrical Roller |
| Item Weight | 2.88 kg (6.35 lb) |
| Cage Material | Brass |
| Number Of Rows | 2 |
| Bore Type | Tapered 1:12 |
| Snap Ring Included | Without Snap Ring |
| Limiting Speed | 3,800 rpm grease; 4,500 rpm oil |
| Internal Clearance | CN |
| Lubricant | Grease or oil |
| Harmonization Code | 8482.50 |
| Mounting Arrangement | Single bearing on a 1:12 tapered spindle journal, no adapter sleeve |
| Bearing Material | Bearing steel |
| Cross Reference 1 | NSK NN3021K (base NSK designation for this bearing) |
|---|---|
| Cross Reference 2 | SKF NN 3021 K (equivalent, tapered bore) |
| Cross Reference 3 | FAG NN3021-AS-K-M-SP (equivalent, machined brass cage, super precision) |
| Cross Reference 4 | Koyo NN3021K (equivalent envelope and bore taper) |
| Cross Reference 5 | NTN NN3021K (equivalent envelope and bore taper) |
| Cross Reference 6 | NSK NN3021 (cylindrical bore version — not interchangeable with the tapered bore) |
NSK NN3021KMBP4 is a double row cylindrical roller bearing built to super-precision tolerances with a 1:12 tapered bore and a machined brass cage. Bore Diameter: 105 mm. Outside Diameter: 160 mm. Overall Width: 41 mm. Rolling Elements: Cylindrical Roller. Number Of Rows: 2. Closure Type: Open. Bearing Material: Bearing steel. Series: NN30 double row cylindrical roller. Base Number: NN3021.
NN — double row cylindrical roller bearing.
3021 — 30 dimension series, 105 mm bore.
K — 1:12 tapered bore.
MB — machined brass cage.
P4 — ISO class 4 precision, ABEC 7 equivalent.
Dynamic Load Rating: 243,000 N. Static Load Rating: 320,000 N. Limiting Speed: 3,800 rpm grease; 4,500 rpm oil. Precision Class: ABEC 7 / P4. Internal Clearance: CN. Cage Material: Brass. Cage Type: Machined. Item Weight: 2.88 kg (6.35 lb). The two roller rows carry radial load only; axial location comes from a separate thrust member in the spindle. Figures are the NSK catalogue values for the complete bearing.
Bore Type: Tapered 1:12. Shaft abutment diameter da min: 114 mm. Housing abutment diameter Da: 148–151 mm. Chamfer r min: 2 mm. Fillet radius ra max: 2 mm. Lubricant: Grease or oil. The tapered bore seats directly on a matching 1:12 taper on the spindle journal; no adapter sleeve is used. Driving the inner ring up the taper expands it and sets the running clearance.
Unit Quantity: 1 Pc. Mounting Arrangement: Single bearing, radial location on a tapered journal. The condition note records that this unit is supplied without its outer ring, as the inner ring, roller and cage assembly only.
Equivalents share the 105 · 160 · 41 mm envelope, the two roller rows and the 1:12 tapered bore. SKF NN 3021 K, FAG NN3021-AS-K-M-SP and Koyo NN3021K are the usual counterparts; precision grade and cage execution differ between makers and should be confirmed against the application.
$76.47
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Rockwell’s own product page for the Kinetix 6000 is down
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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