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：2025-12-09
Application:generator,surgical instruments,sheet industry,construction machinery and equipment,packaging materials,Medical room equipment,food sterilization,Surveying Surveying Instruments,Optical Instruments,stirrer,special broaching machine
Similar models:W 63805 R-2Z 638/4-2Z W 638/2 XR-2Z W 63801 R W 638/1 SAF 22638 x 6.7/8 TLC W 63804-2RS1 W 63803-2RS1 W 63806 W 63800 R
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Model No.	Inner Diameter	Outer Diameter	Width	Type
1025017	260.35	285.75	15.88	Seals
32230/DF	150	270	-	Bearings, units and housings
7009 ACD/P4A	45	75	16	Bearings, units and housings
7638	19.05	44.5	6.35	Seals
850x925x27 HDS1 R	850	925	27	Seals
N 319 ECP	95	200	45	Bearings, units and housings
PBM 223240 M1G1	22	32	40	Bearings, units and housings
PCM 190195100 M	190	195	100	Bearings, units and housings
PWM 404860	40	48	60	Bearings, units and housings
S71910 CB/P4A	50	72	12	Bearings, units and housings
SAF 22522 TLC	100.0125	-	-	Bearings, units and housings
SAFS 22528 x 4.7/8	123.825	-	-	Bearings, units and housings

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