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：2025-12-09
Application:Embroidery,plastic molding,bag machine,motor,Optical detection,historical instruments,journal lathe,plastic blow molding,orthodontic material,garden machinery,molding machine
Similar models:SAF 22638 x 7 T W 63805 W 63802-2Z SAF 22638 x 6.13/16 TLC 638-2RZ W 638/2.5 R-2Z W 63800 SAF 22638 W 638/4 R-2RS1 SAF 22638 x 6.7/8 TLC
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27268	69.85	88.9	9.53	Seals
325 VL R	292	-	-	Seals
35x47x6 HMSA10 RG	35	47	6	Seals
380x440x25 HDS2 R	380	440	25	Seals
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71912 CD/P4A	60	85	13	Bearings, units and housings
MB 19 A	95	133	-	Bearings, units and housings
SAF 22528 x 4.7/8	123.825	-	-	Bearings, units and housings
SILJ 40 ES	40	-	28	Bearings, units and housings
W 628-2RS1	8	24	8	Bearings, units and housings

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