Bearings, units and housings -- Ball bearings -- Deep groove ball bearings -- Deep groove ball bearings -- SKF W 638

W 638

Dimensions

d		8	mm
D		28	mm
B		9	mm
d₂	≈	13.9	mm
D₂	≈	22.38	mm
r_1,2	min.	0.3	mm

Abutment dimensions

d_a	min.	10	mm
d_a	max.	13.8	mm
D_a	max.	26	mm
r_a	max.	0.3	mm

Calculation data

Basic dynamic load rating	C	3.97	kN
Basic static load rating	C₀	1.96	kN
Fatigue load limit	P_u	0.083	kN
Reference speed		67000	r/min
Limiting speed		40000	r/min
Calculation factor	k_r	0.035
Calculation factor	f₀	12.4

Mass

Mass bearing

0.027

Model Number: W 638
Inner Diameter：8mm Outer Diameter：28mm Width：9mm
Reference speed:40000 r/min Limiting speed:67000 r/min
Type：Bearings, units and housings Ball bearings Deep groove ball bearings Deep groove ball bearings
Details： Deep groove ball bearings
Update date：2026-08-24
Application:tapping machine,Industrial,molding machine,Low-voltage electrical equipment,Cylinder Micro,glass,municipal machinery,air purification,rolling machine,Blood coagulation reagent,thin metal materials
Similar models:W 638/4 X-2Z SAF 22638 x 7 W 63803-2RS1 W 63805 W 638/5-2RS1 W 63804-2RS1 W 63805-2RS1 638-RZ W 638/8 R-2Z W 63803 R-2Z
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Model No. Inner Diameter Outer Diameter Width Type

170x190x15 CRSH1 R
25037
HJ 2220 EC
W 637/8 R-2ZS
YSP 211 SB-2F

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Hot number： 22332-2CS5K/VT143 25x52x8 CRW1 R 40x59x8 HMS5 V 60/500 N1MAS 6204/VA201 FSAF 22517 x 2.13/16 T PBM 253535 M1G1 NU 2210 ECM OH 30/900 HE PSM 557070 A51 S7006 ACB/P4A SAF 1611 SAW 23530 x 5.1/4 SNP 3276x13.15/16 SY 45 TDW

Model No.	Inner Diameter	Outer Diameter	Width	Type
170x190x15 CRSH1 R
25037
HJ 2220 EC
W 637/8 R-2ZS
YSP 211 SB-2F