Construction
The outer sleeves are precision ground, high carbon chromium steel Gcr15 (100Cr6/52100) Balls of the same material are accurate to .00025mm

Ball Retaining Cages
The cages are made of yellow brass and aluminium. Ball quantity depends on design load capacity within a given cross
section.

Oil Seal
Bearings are fitted with nitrile oil seals(NBR), where applicable, which are moulded from quality synthetic rubber. Theseals effectively cose both ends of the bearings, serving the dual purpose of retaining the lubricant and protecting theworking surface against abrasive grit, moisture and other foreign matter.

Preloading
Preloading is a condition in which the balls are slightly compressed, causing pressure to be exerted between the bearingsleeve and the shaft. This condition is, in effect a "press fit" although the balls can rotate about their own axesaccording to the movement of the cage.The relative longitudinal travel of the shaft is twice that of the ball cage because the balls travel an equal distance onthe working surfaces of both the bearing sleeve and the shaft.

Spindles and Shafts
Shafts are made from "50" Carbon steel , Induction hardened to a minimum of 60 HRC with a 1.5mm .060)to 2.5mm (.100) depth of case according to the diameter of the shaft and the magnitude of loading. The shaft should beprecision ground, round and parallel, within the recommended limits to provide the correct preload, with a surface finishnot exceeding .25jum (10 micro inches).

Lubrication and Temperature Requirements
All bearings are supplied in rust preventative oil and should be cleaned and lubricated before use.Good quality medium oils and light ball bearing greases have the advantage of greater surface cohesion. High gradelight oil will allow a higher operating speed and greater sensitivity to movement.Working temperatures under maximum load conditions should not exceed 120°C although the bearings can operatesafely at slightly higher temperatures and under decreased load conditions, with special lubricants.For continuous high temperature operation, suitable grades of lithium grease should be used

Bearing Life
The "basic capacity" shown is the load at which 90% of the bearings will complete or exceed one million revolutions,when tested under identical conditions, before the first perceptible sign of fatigue appears. It is generally accepted thatthe life expectancy is always a function of the load and this is inversely proportional to the cube of the basic capacity forbearings. Thus, the operation of a bearing at one half its rated basic capacity will increase to eight million revolutionsand at one quarter of its rated load, to sixty-four million revolutions.

Static Capacity
This is defined as that static radial load which corresponds to the combined permanent deformation of ball and sleeve at
the most heavily stressed contact of .0001 of the ball diameter.

Use
For use primarily in the paper industry this rugged combination selfaligning rotary motion bearing is ideal for use in hostile environments
where heavy load bearing is required alongside rotary motion.

Commonly used models of papermaking equipment

**Doctor Blade Bearings For The Paper Industry**
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SBB 1625	SBB 1619	SBB 1553	SBB 1606	SBB 1389	SBB 1675
SBB 1626	SBB 1620	SBB 1660	SBB 1607	SBB 1550	SBB 1685
SBB 1627	SBB 1576	SBB 1452	SBB 1608	SBB 930	SBB 1704
SBB 1628	SBB 1621	SBB 1633	SBB 1609	SBB 1044	SBB 1711
SBB 1629	SBB 1430	SBB 1634	SBB 1610	SBB 1076	SBB 1791
SBB 1630	SBB 1548	SBB 1635	SBB 1611	SBB 1161	SBB644
SBB 1631	SBB 1561		SBB 1546	SBB 1262	SBB 1820
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