SKF 638/4-2Z — Deep-groove ball bearing
SKF · Bearings & Power Transmission · Deep Groove Ball Bearings
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. Designation follows the ISO 15 / DIN 623 alphanumeric convention where the numeric block encodes the dimension series and bore code; suffixes after the numeric block declare cage, closure, precision, clearance and lubricant execution. Genuine SKF supply carries the SKF logo etch on the outer ring face and hologram-authenticated packaging.
Specifications
- Part number
- 638/4-2Z
- HS code
- 8482.10
- Material
- Bearing steel — 100Cr6 (through-hardened) or SNR-nitrided; cage as declared by suffix
- Temperature range
- -30 to +120 °C standard grease
- Standard
- ISO 15 / ISO 492 / DIN 623
Compatibility
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.
Standards
Also known as — OEM cross-references & superseded numbers
- Timken 63842
- NSK 63842
- NTN 63842
- FAG 63842
- Koyo 63842
- NACHI 63842
- Competitor equivalent: 63842 (Timken)
- Competitor equivalent: 63842 (NSK)
- Competitor equivalent: 63842 (NTN)
- Competitor equivalent: 63842 (FAG)
- Competitor equivalent: 63842 (Koyo)
- Competitor equivalent: 63842 (NACHI)
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