638ceramic Bearing 8289

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638

Bore Diameter:8 mm

Outside Diameter:24 mm

Width:8 mm

Weight:0.022 ( Zro3) 0.012( sI3N4) 0.0054(plastic) kg

The 638 bearing is a ball bearing with an inner diameter of 8 mm , an outer diameter of 24 mm, a width of 8 mm. It typically uses po-p6 grade precision tolerances and open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.

Dimensions:

Inside Diameter:

8 mm

Outside Diameter:

24 mm

Thickness:

8 mm

Weight:

0.022 ( Zro3) 0.012( sI3N4) 0.0054(plastic) KG

Specifications:

Structure:

ball bearing ceramic bearing

Brand:

KMK

Precision Rating:

po-p6

Bearing Material:

stainless steel ,plastic , ceramic , chrome steel

Seals Type:

open

Transaction Information:

Payment term:

T/T Payment in advance

Delivery time:

according to quantity

Detailed description

638ceramic bearing have excellence performance as special electrical and magnetism resistance , could be used in awful environment andspecially condition.

Performance	Unit	GCr15	9Cr18	Si3N4	ZrO2
Density	g/cm3	7.8	7.9	3.2	6
Thermal expansion α	10-6/℃	11	17	3.2	10.5
Elastic modulus E	GPa	208	200	320	210
Poisson's ratioμ		0.3	0.3	0.26	0.3
HardnessHV		800	700	1700	1300
Flexural strength δ	Mpa	2400	2600	900	1000
Compressive strength δ	MPa			2000	3500
Toughness Kc	Nm/cm2	20	25	7	11
Thermal conductivity λ	W/mk	30-40	15	3.5	2.5
Electric resistance Ω	mm2/m	1	0.75	1018	1015
Specific heat	J/KgK	450	450	800	400
Temperature	.℃	120	150	1000	800
Corrosion-resistant		No	Weak	Strong	Strong
Stress cycles (50% failure probability)		10*106	10*106	50*106	50*106
Contact fatigue failure modes		Flake	Flake	Flake	Flake/Break
Magnetic		Exist	Exist	Not Exist	Not Exist
Dimensional stability		Poor	Poor	Good	Good
Insulating		Not insulated	Not insulated	Good	Good

Performance	Unit	Boron carbide	Aluminum oxide	Toughened Aluminum oxide	Zirconium oxide	Silicon nitride	Silicon carbide
Symbol	B4C	99% Al2O3	ZTA-20%	ZrO2	Si3N4	SiC
Density	g/cm3	2.4~2.51	3.7~3.99	5.5	6	3.2	3.2
Hardness HV	Kg/mm	2700~3200	2300~2700	1470~1500	1300~1500	1700 ~2700	2350~2450
Flexural strength	MPa	350~400	300~400	700	1000~1500	900	450~800

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How can you buy 638ceramic Bearing 8*28*9 on the Internet?
High quality 638 ( 0.022 ( Zro3) 0.012( sI3N4) 0.0054(plastic) kg Mass, ID: 8 mm OD: 24 mm WD: 8 mm , po-p6 Accuracy Class , stainless steel ,plastic , ceramic , chrome steel Material ), Just click the button " Contact Now " to mention your purchase Requirement , Quantity and Contact Method of your requested Bearing Item No. 638. then click the button " Send " The web site will make your purchasing information sent to the supplier's mailbox, who will come to contact you upon they get your information at the first time.

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638ceramic Bearing 8289

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