SKF 638/4-2Z Deep-groove ball bearing
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Product Description
SKF 638/4-2Z deep-groove ball bearing. Deep-groove ball bearing designed for combined radial and moderate axial load, high running speed and low frictional torque. Manufactured to ISO 492 (Class Normal / P6 / P5) with standard C0 radial internal clearance unless a suffix declares otherwise. Available in open, single-shielded (Z), double-shielded (2Z), single-lip contact-sealed (RSH / RS1), and double-lip contact-sealed (2RSH / 2RS1) execution. Bore, outside diameter and width follow the ISO 15 dimension plan.
Technical Specifications
- Type
- Deep-groove ball bearing
- Designation
- SKF 638/4-2Z
- Standard
- ISO 15 / DIN 623 dimension plan; ISO 492 Class Normal precision
- HS code
- 8482.10
- Bore diameter
- 4 mm
- Outside diameter
- 9 mm
- Width
- 4 mm
- Basic dynamic load rating
- 0.423 kN
- Basic static load rating
- 0.116 kN
- Reference speed
- 140000 r/min
- Limiting speed
- 70000 r/min
- Filling slots
- Without
- Number of rows
- 1
- Locating feature, bearing outer ring
- Without
- Bore type
- Cylindrical
- Matched arrangement
- No
- Radial internal clearance
- CN
- Material, bearing
- Bearing steel
- Coating
- Without
- Sealing
- Shield on both sides
- Sealing type
- Non-contact
- Lubricant
- Grease
- Relubrication feature
- Without
- Indicative carbon footprint for new product
- 0.004 kg CO2e
- Product net weight
- 0.001 kg
- eClass code
- 23-05-08-01
- UNSPSC code
- 31171504
Standards & Compliance
- Standard
- ISO 15 / ISO 492 / DIN 623
- Material
- Bearing steel — 100Cr6 (through-hardened) or SNR-nitrided; cage as declared by suffix
- Temperature Range
- -30 to +120 °C standard grease
- HS Code
- 8482.10
Cross References
- Timken 63842
- NSK 63842
- NTN 63842
- FAG 63842
- Koyo 63842
- NACHI 63842
- Equivalent: 63842 (Timken)
- Equivalent: 63842 (NSK)
- Equivalent: 63842 (NTN)
- Equivalent: 63842 (FAG)
- Equivalent: 63842 (Koyo)
- Equivalent: 63842 (NACHI)
Compatibility & Fitment
ISO 15 boundary-plan interchange — the numeric bore-code block is portable across every ISO 15 bearing manufacturer (SKF, Timken, NSK, NTN, FAG, Koyo, NACHI). Confirm suffix compatibility on cage, seal, clearance and precision class before substitution.
Product Documentation
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Technical guides
Catalogue entry last verified: 2026-09-30. A manufacturer datasheet is attached to this entry — confirm application-critical values against it.
Frequently asked questions
- Where can I buy 638/4-2Z?
- 638/4-2Z 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 638/4-2Z.
- What is the HS code for 638/4-2Z?
- The customs tariff (HS) code for 638/4-2Z is 8482.10.
- Who manufactures 638/4-2Z?
- 638/4-2Z is a SKF product in the Bearings & Power Transmission range.
- Is a datasheet available for 638/4-2Z?
- Yes — the 638/4-2Z datasheet can be viewed and downloaded on this page.
- What is the minimum order quantity for 638/4-2Z?
- The minimum order quantity is 1.
- Is 638/4-2Z available?
- Yes — 638/4-2Z 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).