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FAQS

QHow long is Shelf life of bearing?

AShelf life should be distinguished from lubricated bearing/component design life as follows: Shelf life of the grease-lubricated bearing/component represents the period of time prior to use or installation.The shelf life is a portion of the anticipated aggregate design life. It is impossible to accurately predict design life due to variations in lubricant bleed rates, oil migration, operating conditions, installation conditions, temperature, humidity and extended storage.

QHow to storage?

AWe suggests the following storage guidelines for our finished products (bearings, components and assemblies,referred to as “products”): • Products should be kept in their original packaging until they are ready to be placed into service. • Do not remove or alter any labels or stencil markings on the packaging. • Products should be stored in such a way that the packaging is not pierced, crushed or otherwise damaged. • After a product is removed from its packaging, it should be placed into service as soon as possible. • When removing a product that is not individually packaged from a bulk pack container, the container should be resealed immediately after the product is removed. • The storage area temperature should be maintained between 0° C (32° F) and 40° C (104° F); temperature fluctuations should be minimized. • The relative humidity should be maintained below 60 percent and the surfaces should be dry. • The storage area should be kept free from airborne contaminants such as, but not limited to, dust, dirt, harmful vapors, etc. • The storage area should be isolated from undue vibration. • Extreme conditions of any kind should be avoided

QWhat is DOUBLE-ROW BEARINGS?

AThis has a one-piece (double) outer ring and two single inner rings. It is usually supplied complete with an inner-ring spacer as a pre-set assembly. This configuration gives a wide effective bearing spread and is frequently chosen for applications where overturning moments are a significant load component. TDO bearings can be used in fixed (locating) positions or allowed to float in the housing bore, for example, to compensate for shaft expansion. TDOCD outer rings also are available in most sizes. These outer rings have holes in the O.D. that permit the use of pins to prevent outer ring rotation in the housing.

QHow many cage materials for TAPERED ROLLER BEARING?

ASTAMPED-STEEL CAGES The most common type of cage used for tapered roller bearings is the stamped-steel cage. These cages are mass produced from low-carbon sheet steel using a series of cutting, forming and punching operations. These cages can be used in high temperature and harsh lubricant environments. POLYMER CAGES Cages for tapered roller bearings made of polymer material are used primarily for pre-greased and sealed package designs. The most common polymer materials used are Nylon thermoplastics with glass reinforcement. Polymer cages can be mass produced in large quantities and offer more design flexibility than stampedsteel types. Polymer cages are lightweight and easy to assemble. In some instances, increased bearing rating can be achieved by allowing one or two extra rollers in the bearing complement. Care should be exercised when using aggressive lubricants with EP (extreme-pressure) additives in combination with elevated temperatures greater than 107° C (225° F). MACHINED CAGES Machined cages for tapered roller bearings are robust in design and are suited for high-speed and high-load applications.Machined cages use alloy steels and are produced through milling and broaching operations. Assembly does not require a close-in operation and rollers can be retained using nibs or staking. Oil holes also can be easily added for extra lubrication for demanding applications. Some designs are silver plated for special applications PIN-TYPE CAGES Tapered roller bearing pin-type cages retain the rolling elements by the use of a pin located through an axial hole in the center of the roller. Pin-type cages for tapered roller bearings consist of two rings with roller pins attached by screw threads at one end and welding at the other end. These types of cages are primarily used for larger tapered roller bearing designs (greater than 400 mm [15.7480 in.] O.D.). Pin-type cages are machined out of steel and typically allow for an increased number of rolling elements. Pin-type cages are restricted to low-speed applications (less than 20 m/sec [4000 ft/min] rib speed).

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