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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
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1 in stock
Super-precision double-row NNU cylindrical roller bearing, 105 x 145 x 40 mm, 1:12 tapered bore, SP class, brass cage, C1 clearance. 5,500 rpm grease.
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| MFR / Brand | FAG |
|---|---|
| MPN | NNU4921-S-K-M-SP |
| Model | NNU4921-S-K-M-SP |
| Bearing Type | Cylindrical Roller Bearing, Open |
| ID | 105 mm |
| OD | 145 mm |
| Width | 40 mm |
| Material | Bearing Steel |
|---|---|
| Series | NNU49 |
| Lubricant | Grease or oil |
| Mpn Variants | NNU4921-S-K-M-SP, NNU4921SK.M.SP, NNU4921SKMSP, NNU-4921-S-K-M-SP, NNU4921 |
| Precision Class | SP |
| Min Temp | -30 °C |
| Dynamic Load Rating | 130,000 N |
| Static Load Rating | 260,000 N |
| Rolling Elements | Cylindrical Roller |
| Max Temp | 150 °C |
| Item Weight | 1.95 kg (4.30 lb) |
| Cage Material | Machined brass |
| Number Of Rows | 2 |
| Bore Type | Tapered 1:12 |
| Snap Ring Included | Without Snap Ring |
| Limiting Speed | 5,500 rpm grease; 6,500 rpm oil |
| Internal Clearance | C1 |
| Relubrication Feature | Lubrication groove and holes in outer ring |
| Harmonization Code | 8482.50.00 |
| Mounting Arrangement | Non-locating |
| Cross Reference 1 | SKF NNU 4921 BK/SPW33 |
|---|---|
| Cross Reference 2 | FAG NNU4921SK.M.SP (previous designation) |
FAG NNU4921-S-K-M-SP is a super-precision double-row cylindrical roller bearing of type NNU for machine-tool spindles. Bore Diameter: 105 mm (small end of taper). Outside Diameter: 145 mm. Overall Width: 40 mm. Number Of Rows: 2. Bore Type: Tapered 1:12. Non-locating, separable design with ribs on the outer ring. Rolling Elements: Cylindrical Roller.
NNU4921 — double-row NNU type, 49 dimension series; bore code 21 = 105 mm.
S — lubrication groove and holes in the outer ring.
K — tapered bore, taper 1:12, for clearance adjustment on the spindle journal.
M — machined brass cage.
SP — Schaeffler super-precision tolerance class.
Dynamic Load Rating: 130,000 N. Static Load Rating: 260,000 N. Fatigue Load Limit: 34,500 N. Limiting Speed: 5,500 rpm grease; 6,500 rpm oil. Operating Temperature: -30 to 150 °C. Internal Clearance: C1 (smaller than C2). Precision Class: SP. Cage Material: Machined brass. Item Weight: 1.95 kg (4.30 lb). Lubricant: grease or oil, through the outer-ring groove (3.2 mm holes, 6.5 mm groove width).
Permissible Axial Displacement: 2 mm. Inner Ring Raceway Diameter (F): 118 mm. Shaft Shoulder Diameter: 117 mm. Housing Shoulder Diameter: 134 mm. Minimum Chamfer: 1.1 mm. Maximum Recess Radius: 1 mm.
Current Schaeffler designation NNU4921-S-K-M-SP replaces NNU4921SK.M.SP. SKF NNU 4921 BK/SPW33 has the same size, tapered bore and lubrication-groove configuration.
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