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

W 638/4 R-2Z

Dimensions

d		4	mm
D		9	mm
B		4	mm
d₁	≈	5.2	mm
D₂	≈	8.1	mm
D₃		10.3	mm
C		1	mm
r_1,2	min.	0.1	mm

Abutment dimensions

d_a	min.	4.8	mm
d_a	max.	5.1	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

0.0011

Model Number: W 638/4 R-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：2026-01-09
Application:garden machinery,labor insurance,machine lathe,chromatography,electromagnetic clutch,bathroom facilities,Logistics Equipment,trolley,plastic molding,Workpiece,other processing
Similar models:W 63805 R 638/8-2Z W 63801-2RS1 W 638/5 R-2Z W 63803 W 638/2-2Z SAF 22638 x 6.7/8 TLC SAF 22638 x 7 T W 638/1 W 63806
BEARING POWER International Trading Co.,Ltd. specialize in W638/4R-2Z products，there is large inventory of SKF W 638/4 R-2Z Deep groove ball bearings. We has been built up long-term cooperation with SKF company, could make a bulk order of the W 638/4 R-2Z Which SKF W638/4R-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

25x40x8 HMS5 V
630/8-2RS1
GEZH 400 ES
K 68x74x30
TU 25 FM

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

Hot number： 13992 40x62x10 HMS5 V 55x78x10 HMSA10 V 6215 M 9903 BT4B 331487 G/HA1 C 4024 K30V/VE240 MVR1-65 SAF 22308 SAFS 23040 KA x 7.1/8 SIKAC 16 M/VZ019 SNL 3176 ATURT W 603 X-2Z W 6302 YSPAG 206-103

Model No.	Inner Diameter	Outer Diameter	Width	Type
25x40x8 HMS5 V
630/8-2RS1
GEZH 400 ES
K 68x74x30
TU 25 FM