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

W 638/4 X-2RZ

Dimensions

d		4	mm
D		10	mm
B		4	mm
d₁	≈	5.9	mm
D₂	≈	8.8	mm
r_1,2	min.	0.2	mm

Abutment dimensions

d_a	min.	5.6	mm
d_a	max.	5.8	mm
D_a	max.	8.9	mm
r_a	max.	0.2	mm

Calculation data

Basic dynamic load rating	C	0.553	kN
Basic static load rating	C₀	0.245	kN
Fatigue load limit	P_u	0.011	kN
Reference speed		130000	r/min
Limiting speed		63000	r/min
Calculation factor	k_r	0.02
Calculation factor	f₀	12.3

Mass

Mass bearing

0.0013

Model Number: W 638/4 X-2RZ
Inner Diameter：4mm Outer Diameter：10mm Width：4mm
Reference speed:63000 r/min Limiting speed:130000 r/min
Type：Bearings, units and housings Ball bearings Deep groove ball bearings Deep groove ball bearings
Details： Deep groove ball bearings
Update date：2026-04-16
Application:medical equipment,animal anatomy,position switch,Control,hydraulic control element,storage and transportation equipment,Surveying Surveying Instruments,lathe,power source,gas turbine,electromagnetic clutch
Similar models:W 638/8 R-2Z W 638/2 X-2Z W 63801 R-2Z W 638/4 X-2RS1 W 63805 R-2Z W 63804 W 63800-2RS1 W 638 W 638/9-2Z W 638/2.5 R-2Z
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Model No.	Inner Diameter	Outer Diameter	Width	Type
160x190x15 HMSA10 RG	160	190	15	Seals
320/28 X	28	52	16	Bearings, units and housings
6210 NR	50	90	20	Bearings, units and housings
7017 CE/HCP4AL1	85	130	22	Bearings, units and housings
86754	-	-	19.05	Seals
90761	-	-	19.05	Seals
IR 120x130x30 EGS	120	130	30	Seals
LR 25x30x12.5	25	30	12.5	Bearings, units and housings
NRT 325 B	325	450	60	Bearings, units and housings
NU 212 ECM	60	110	22	Bearings, units and housings
S7001 ACD/P4A	12	28	8	Bearings, units and housings
SAF 22509 T	36.5125	-	-	Bearings, units and housings

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Hot number： 23238 CCK/W33 30x56x8 CRW1 R 3125544 470921 61888 MA 72x95x10 HMS5 RG BA1B 311745 C 3156 K 89432 M SAF 23034 KATLC x 5.15/16 SAF 23036 KA x 6.5/16 SY 2. TF SY 60 TR TUJ 25 TF WS 89428