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

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.	4.6	mm
d_a	max.	5.1	mm
D_a	max.	8.4	mm
r_a	max.	0.1	mm

Calculation data

Basic dynamic load rating	C	0.54	kN
Basic static load rating	C₀	0.18	kN
Fatigue load limit	P_u	0.07	kN
Reference speed		140000	r/min
Limiting speed		70000	r/min
Calculation factor	k_r	0.015
Calculation factor	f₀	10

Mass

Mass bearing

0.0013

Model Number: 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：2026-04-16
Application:garden machinery,labor insurance,stacker lift platform,Individual Wire,plant determination,Garment Accessories,hydraulic pressure gauge,climb ladder,non-ferrous metal alloy,thin metal materials,tooth filling
Similar models:W 63806-2RS1 W 638/4 X-2RZ W 63802 R W 638/1 W 638/2-2Z W 63804-2RS1 SAF 22638 x 6.7/8 T W 63805 W 63804 R-2Z SAF 22638 x 7
BEARING POWER International Trading Co.,Ltd. specialize in 638/4-2Z products，there is large inventory of SKF 638/4-2Z Deep groove ball bearings. We has been built up long-term cooperation with SKF company, could make a bulk order of the 638/4-2Z Which SKF 638/4-2Z 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
28x47x7 HMSA10 V	28	47	7	Seals
33x45x7 HMSA10 V	33	45	7	Seals
86468	-	-	44.45	Seals
BT4B 334116 G/HA1VA901	479.425	679.45	-	Bearings, units and housings
FSAF 1520 TLC	87.3125	-	-	Bearings, units and housings
GS 81260	300	420	28.5	Bearings, units and housings
HME 31/670	106	-	670	Bearings, units and housings
NRT 325 B	325	450	60	Bearings, units and housings
S7017 ACB/P4A	85	130	22	Bearings, units and housings
SAF 22618 x 3.1/16 T	77.7875	-	-	Bearings, units and housings
SAF 23052 KA x 9.7/16	239.7125	-	-	Bearings, units and housings
W 63805-2RS1	25	37	10	Bearings, units and housings

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