SKF NNU4938BK/SPW33 Super-precision cylindrical roller bearing (NN 30XX / N 10XX)
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Product Description
SKF NNU4938BK/SPW33 super-precision cylindrical roller bearing (nn 30xx / n 10xx). Super-precision (ISO 492 P4A / P2A) double-row (NN 30xx) or single-row (N 10xx) cylindrical roller bearing designed as the non-locating position on a machine-tool spindle. Very high radial rigidity and running accuracy. Tapered bore (K suffix) allows radial preload to be set at assembly. Fitted with a machined brass cage.
Technical Specifications
- Type
- Super-precision cylindrical roller bearing (NN 30xx / N 10xx)
- Designation
- SKF NNU4938BK/SPW33
- Bore d
- 190 mm
- HS code
- 8482.20
- Bore diameter
- 190 mm
- Outside diameter
- 260 mm
- Width
- 69 mm
- Basic dynamic load rating
- 402 kN
- Basic static load rating
- 880 kN
- Attainable speed for grease lubrication
- 2800 r/min
- Attainable speed for oil-air lubrication
- 3200 r/min
- Bearing part
- Complete bearing
- Number of rows
- 2
- Bore type
- Tapered 1:12
- Cage
- Machined metal
- Design
- NNU
- Number of flanges, outer ring
- 3
- Number of flanges, inner ring
- 0
- Loose flange
- None
- Radial internal clearance
- C1
- Tolerance class
- Class SP (SP)
- Material, bearing
- Bearing steel
- Coating
- Without
- Sealing
- Without
- Lubricant
- None
- Relubrication feature
- Annular groove and lubrication holes
- Indicative carbon footprint for new product
- 38.9 kg CO2e
- Product net weight
- 10.5 kg
- eClass code
- 23-05-09-01
- UNSPSC code
- 31171505
Standards & Compliance
- Standard
- SKF designation convention
- Material
- As declared by SKF designation suffix
- Temperature Range
- Per SKF product data
- HS Code
- 8482.20
Cross References
- FAG 493833
- NSK 493833
- GMN 493833
- Timken 493833
- Koyo 493833
- Equivalent: 493833 (FAG)
- Equivalent: 493833 (NSK)
- Equivalent: 493833 (GMN)
- Equivalent: 493833 (Timken)
- Equivalent: 493833 (Koyo)
Compatibility & Fitment
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.
Product Documentation
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Technical guides
- Cylindrical Roller Bearing Finder — by Bore and Design (NU, NJ, NUP, N, NN / NNU double row) SKF
- SKF 81xxx Cylindrical Roller Thrust Bearing — Dimensions, Load Ratings & Interchange (81102 to 81140)
- SKF Deep Groove Ball Bearing Reference — 6000 / 6200 / 6300 / 6400 Series (Dimensions, Load Ratings, Interchange to FAG NSK NTN Timken)
Catalogue entry last verified: 2026-08-20. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy NNU4938BK/SPW33?
- NNU4938BK/SPW33 can be ordered from cballast.com as a SKF catalogue item: request a quotation on this page or email sales@cballast.com, and the order ships worldwide.
- What is the manufacturer part number for this SKF product?
- The manufacturer part number is NNU4938BK/SPW33.
- What is the HS code for NNU4938BK/SPW33?
- The customs tariff (HS) code for NNU4938BK/SPW33 is 8482.20.
- Who manufactures NNU4938BK/SPW33?
- NNU4938BK/SPW33 is a SKF product in the Bearings & Power Transmission range.
- Is a datasheet available for NNU4938BK/SPW33?
- Yes — the NNU4938BK/SPW33 datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for NNU4938BK/SPW33?
- The minimum order quantity is 1.
- Is NNU4938BK/SPW33 available?
- Yes — NNU4938BK/SPW33 is available to order: fulfilment is from supplier stock in cBallast's European network, dispatched directly from the warehouse to the customer, with the exact lead time stated in the quotation (reply within 24 hours).