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

W 638/4-2RZ

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.	4.8	mm
d_a	max.	5.1	mm
D_a	max.	8.2	mm
r_a	max.	0.1	mm

Calculation data

Basic dynamic load rating	C	0.364	kN
Basic static load rating	C₀	0.114	kN
Fatigue load limit	P_u	0.005	kN
Reference speed		140000	r/min
Limiting speed		70000	r/min
Calculation factor	k_r	0.02
Calculation factor	f₀	6.5

Mass

Mass bearing

0.001

Model Number: W 638/4-2RZ
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：2026-07-31
Application:Broadcasting System,Display Devices,rolling machine,Tool,hydraulic cylinder buffer,Internal thread type,Gear grinding machine,training beds etc,dynamic blood pressure,reducer,Medical room equipment
Similar models:W 638/4 R-2RS1 W 638/3-2RS1 W 638 W 638/4 R-2Z 638/4-2Z SAF 22638 x 7 TLC W 638/4 XR-2Z W 63801-2RZ W 638/8-2Z W 638/2 R-2Z
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Model No. Inner Diameter Outer Diameter Width Type

6208-2ZNR
7018 CD/HCP4AH1
HE 2322
KMFE 20 L
NJ 2218 ECN1ML

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Hot number： 110 VA R 15957 BD-23096 CAK/W33-AOHX 3096 G 22236-2CS5/VT143 23160 CCK/W33 71821 ACD/HCP4 7213 BECBY FSAF 22518 x 3.1/8 TLC FYT 1.1/4 TF/VA201 G 25x32x4 PF 17 RM PF 50 TR SAFS 22520-11 TLC SYR 2 15/16-3 YSP 209-111 SB-2F

Model No.	Inner Diameter	Outer Diameter	Width	Type
6208-2ZNR
7018 CD/HCP4AH1
HE 2322
KMFE 20 L
NJ 2218 ECN1ML