Bearings, units and housings -- Ball bearings -- Deep groove ball bearings -- Deep groove ball bearings -- SKF 638/4-2Z

638/4-2Z

Dimensions

d		4	mm
D		9	mm
B		4	mm
d₁	≈	5.2	mm
D₂	≈	8.1	mm
r_1,2	min.	0.1	mm

Abutment dimensions

d_a	min.	4.6	mm
d_a	max.	5.1	mm
D_a	max.	8.4	mm
r_a	max.	0.1	mm

Calculation data

Basic dynamic load rating	C	0.54	kN
Basic static load rating	C₀	0.18	kN
Fatigue load limit	P_u	0.07	kN
Reference speed		140000	r/min
Limiting speed		70000	r/min
Calculation factor	k_r	0.015
Calculation factor	f₀	10

Mass

Mass bearing

0.0013

Model Number: 638/4-2Z
Inner Diameter：4mm Outer Diameter：9mm Width：4mm
Reference speed:70000 r/min Limiting speed:140000 r/min
Type：Bearings, units and housings Ball bearings Deep groove ball bearings Deep groove ball bearings
Details： Deep groove ball bearings
Update date：2026-07-29
Application:hinge industry,teaching equipment,marine analysis,Pneumatic Control Elements,Storage Device,other CNC,food add,other accessories,building decoration raw materials and accessories,Medical room equipment,Other Measurements
Similar models:W 63803-2RZ W 63801-2RZ SAF 22638 x 6.13/16 TLC W 638/1.5-2Z W 638/3 R-2Z W 63806 R-2Z W 63802-2RS1 W 63803-2Z W 63801 R W 638/4-2Z
BEARING POWER International Trading Co.,Ltd. specialize in 638/4-2Z products，there is large inventory of SKF 638/4-2Z Deep groove ball bearings. We has been built up long-term cooperation with SKF company, could make a bulk order of the 638/4-2Z Which SKF 638/4-2Z is the most authentic, must choose BEARING POWER, what a whole variety, reasonable price, guaranteed quality, prompt delivery via Global express. Any inquiry, never hesitate to E-mail or call +86-022-58519721 to contact us.
Model No. Inner Diameter Outer Diameter Width Type

22558
K 81244 M
KRE 90 PPA
PSM 040804 A51
SYR 1 1/2

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Model No.	Inner Diameter	Outer Diameter	Width	Type
22558
K 81244 M
KRE 90 PPA
PSM 040804 A51
SYR 1 1/2