SKF 638/4-2Z Deep-groove ball bearing

SKF · Bearings & Power Transmission · Deep Groove Ball Bearings · Sweden · skf.com

Part Number
638/4-2Z · HS 8482.10

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

Properties

Material	Bearing steel — 100Cr6 (through-hardened) or SNR-nitrided; cage as declared by suffix
Temperature range	-30 to +120 °C standard grease
Primary standard	ISO 15 / ISO 492 / DIN 623
MOQ	1

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

ISO 15
ISO 492
DIN 623

Cross-References

Timken 63842
NSK 63842
NTN 63842
FAG 63842
Koyo 63842
NACHI 63842

Attached Documents

SKF 638/4-2Z Deep-groove ball bearing — Specification sheet