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：2025-12-09
Application:safety testing,decoration machinery,forklift industry,powder metallurgy,Hydraulic Rama,Perfusion device,manual Tools,directional control valve,mechanical annex,top industry,electromyography machine
Similar models:638/4-2Z W 63805 R W 63805 R-2Z W 63801 R-2Z W 638/3-2Z W 63801 W 63804 W 63806-2Z W 63800 R W 63805-2Z
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
24028 CCK30/W33	140	210	69	Bearings, units and housings
6204/HR22Q2	20	47	14	Bearings, units and housings
7006 ACE/HCP4AH1	30	55	13	Bearings, units and housings
90886	-	-	50.8	Seals
FSAF 1615 x 2.3/8 T	60.325	-	-	Bearings, units and housings
FSAF 22515 x 2.1/2	63.5	-	-	Bearings, units and housings
FYTWK 506 Y	-	-	-	Bearings, units and housings
K 55x63x20	55	63	20	Bearings, units and housings
N 1014 KTNHA/HC5SP	70	110	20	Bearings, units and housings
NNC 4838 CV	190	240	50	Bearings, units and housings
S7021 ACD/P4A	105	160	26	Bearings, units and housings
SAFS 23044 KAT x 7.7/8	200.025	-	-	Bearings, units and housings

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

Hot number： 12379 315835 A 28646 415500 43650 45x65x10 HMS5 V 61806-2RS1 70/1180 AMB FSAF 22517 T NJ 228 ECJ SAF 23034 KATLC x 5.7/8 SAFS 23040 KA x 7.3/16 SNW 3138x6.15/16 SSAFS 22530 x 5.1/8 WS 81215