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

W 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.	4.8	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

0.00093

Model Number: W 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：2026-07-30
Application:squeeze machine etc,generator,Small air generators,Tool,Flame Cutting,engine,rolling mill roll neck and slowdown device,Industry,Cylinder Micro,Broadcasting System,training beds etc
Similar models:W 63801 W 63806-2RS1 W 63801 R W 638/5-2RS1 SAF 22638 W 63801-2RS1 W 638/2.5-2Z SAF 22638 T W 63802 R W 63806 R-2Z
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Model No. Inner Diameter Outer Diameter Width Type

314486 A
38678
707 CE/P4A
PCM 13514080 M
W 6301-2RS1

Purchase the SKF W 638/4-2Z Please fill in the following

Hot number： BD-230/800 CAK/W33-AOH 30/800 24x42x8 HMSA10 V 31314 55x90x8 HMSA10 RG 6010-RS1 BS2-2208-2RSK/VT143 C 4010 V D/W R3-2Z HE 2324 L HE 3120 E NA 6910 NJ 313 ECP NK 70/35 SAF 22632 x 5.1/2 T SSAFS 22238 T

Model No.	Inner Diameter	Outer Diameter	Width	Type
314486 A
38678
707 CE/P4A
PCM 13514080 M
W 6301-2RS1