608zz Deep Groove Ball Bearings

Product Details

Product Description

Company Info.

Overview
Product Description

Basic Info.

Model NO.

608zz Deep Groove Ball Bearing

Type

Ball

Material

AISI440, 440c, 304

Tolerance

Certification

ISO9001

Clearance

ABS

With ABS

Brand

China Automotive

Suitable for Car Brands

China Automotive

Structure

Deep Groove

Samples

Yes

Quality

ISO

OEM

Yes

Transport Package

Carton

Specification

SGS

Trademark

fuqin

Origin

China

HS Code

84821090

Packaging & Delivery

Package Size

10.00cm * 18.00cm * 18.00cm

Package Gross Weight

10.000kg

Product Description

Materials of Bearings

Bearing ring and roller body are mainly made of high C-Cr bearing steel. Listed below are compositions of material for bearing ring and roller body.

Steel Code	Chemical composition%
Gcr15 SAE52100 DIN 100 Cr6 JIS SUJ2	C	Si	Mn	P	S	Cr	Mo	Cu	Ni
Gcr15 SAE52100 DIN 100 Cr6 JIS SUJ2	0.95-1.05	0.15-0.35	0.25-0.45	<0.025	<0.025	1.40-1.65	-	<0.25	<0.30

Material for bearing ring and roller body mainly consists of high C-Cr bearing steel.

selection of material of cages.

Drawing steel sheet cage
These light cages hold a high strength with reduced friction and wear in an effective way after surface treatment. The following table covers compositions of material for cold-rolled steel sheet.

Steel code	Chemical Composition%
JISG 3141 SPCC	C	Si	Mn	P	S	Ni	Cr
JISG 3141 SPCC	<0.12	-	<0.5	<0.04	<0.045	-	-

Brass cage
Cut brass cage is adopted in small and medium bearings. However, brass cage is not suitable for compressors with ammonia cooling due to potential seasonal cracking of brass. It is recommended to replace it with iron cage.
Nylon cage
According to the type and usage of bearings, nylon cages are widely adopted, but they are inappropriate for environments where the temperature is above 120ºC or below 40 ºC. Most of cast molding cages adopt nylon PA66 material, with or without glass fiber reinforcement whose advantage is a good combination of strength and elasticity.

Materials for dust shield and seal ring

Material for dust shield
we use cold-rolled tin plate as the standard mateiral for dust shields, but also use stainless steel of AISI-300 specification at times.
Material for seal ring
Seal rings are mainly made of NBR. For high temperature, fluororubbers and silicon rubbers are widely used as well.

Type	ASTM D1418 Name	Temperature Range	Hardness (Shore A)	Features	Restriction
Nitrile butaduene rubber	NBR	-40ºC~120ºC	40-90	Low compression High ductility High corrosion resistance superior oil resistance	Unsuitable for high temperature conditions; No exposure to the sun and corrosion of chemicals
Silicon rubber	MQ/PMQ VMQ/PVMP	-70ºC~200ºC	25-80	High temperature resistance Desiccation resistance Sunshine resistance aging resistance to ozone	Poor surface abrasion performance and crack resistance, higher wear resistance
Hydrogenated (nitrile-butadiene rubber)	HNBR/NEM	-35ºC~65ºC	50-90	Heat resistance High ductility Chemical resistance	Unsuitable for high temperature conditions and shall avoid exposure to the sun and corrosion of chemicals
Fluororubber	FKM/FPM	-28ºC~200ºC	50-95	High temperature resistance Significant chemical resistance corrosion resistance to petroleum products	It is not suitable for working conditions of low temperature.
ACM rubber	ACM Rubber	-18ºC~175ºC	40-90	Stronger resistance to hot oil Sunlight and ozone Higher crack resistance	poor waterproof performance; unsuitable for working condition of ultra-low temperature
Warning:fluro rubber is safe and harmless under normal working condition of below 200ºC, but it will give off smoke if the temperature exceeds the ultimate temperature of 300ºC that is equivalent to flame for cutting steel tubes. Inhalation of the smoke is harmful to human bodies including eyes. In addition, the smoke should be avoided to contact skin.

Lubrication of Bearings

Grease lubrication	Lipid lubricants are much easier to use than oil lubricants. Due to its ciscosity,grease is more durable and only needs simple sealing equipment to contain. Grease is hard to be changed, beacause the usual approach of it is to press grease into device to make fresh grease squeeze used grease out. General speaking, grease with low viscosity primary oil is more suitable for high speed operations at low temperature, while grease with high viscosity primary oil is suitable for heavy load.
Oil lubrication	Oil lubrication is more suitbale for applications under conditions of high speed and high temperature, effectively taking the heat generated in operation of bearings away. Viscosity of oil determines the effects of oil lubrication. Low viscosity will lead to inadequate formation of oil film, while high viscosity will increase viscous drag and temperature. In general, the higher rotational speed is the lower viscosity of lubricant oil will be; the larger load is, the higher viscosity of lubricant oil will be.
Primary oil	In grease, primary oil accounts for 75-96%. In mass fraction, the performance of grease mainly relies on the nature of primary oil. Particularly when it is with cold flow property and at high temperature, its service life is bound up with primary oil. Grease with low viscosity primary oil is usually applicable to low temperature and low load, while lubrication grease with high viscosity primary oil is applied to high temperature and high load. Primary oil used in grease includes mineral oil and synthetic oil. The commonly used synthetic primary oils contain lipid oil, sythetic hydrocarbon oil, perfluoropolyether, silicon oil and PPO, etc.
Thickener	Thickener generally accounts for 4~20% in mass fraction. Its functions are to suspend primaty oil, reduce the flow of primaty oil, and increase adhesion of oil to friction surface. Thickener has two categories: metallic soap base and non-metallic soap base. Critical operating temperature, mechanical stability, water resistance and other properties of grease are determined by thickener, for example, sodium soap base can react with water to form a kind of latex, which can not be applied to running bearing in the atomsphere of high temperature.
Additive	In grease, primary oil accounts for 0.5~10%. In mass fraction, which is used for the improvement of operating performance and life of grease. Accordign to the classification by function, it can be divided into thickener(strong adhesion), antioxidant, extreme-pressure additive, corrosion inhibitor,etc.