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Cylindrical Roller Bearings
American Cylindrical Roller Bearings are manufactured from the cleanest and finest commercially available AISI bearing steels. Standard tolerances are RBEC-1 and ISO class Normal, but can be made to tighter limits if required. Our size range for standard and special cylindrical roller bearings is 100mm(4.0 in.) I.D. and 1800mm(72 in.) O.D. This catalog shows the most commonly used types of cylindrical roller bearings: Single Row (ISO), Single Row Domestic, Inch Series, Double Row (ISO), Full Complement Single Row and Full Complement Double Row. For Four Row Cylindricals and Line Shaft/Table Row Bearings (AD-SM) types, go to our Rolling Mill Section.
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Cages are fully machined from Centrifugally Cast Brass alloy as a standard feature. In the (ISO) product line, the suffix “M” is added to indicate this, but no suffix is used in the Domestic and Inch Series product lines. Also, in the (ISO) line, a “C3” internal clearance will be provided unless otherwise specified. In the ISO nomenclature system, no internal clearance designation means that the bearing has “Normal” internal clearance. “Normal” is often too tight for most applications. Cylindrical roller bearings come in many different “styles” that are created by the presence or absence of flanges on both sides of the inner and outer races. The most common type is the “NU” or “AD” style that has two outer race flanges creating a channel that guides the rollers and a straight inner race that allows axial float. This is beneficial as it accommodates the stack-up of axial tolerances and thermal growth. Other styles with flanges on both races can to used to axially locate the shaft when thrust loads are minimal or non existent. Most cylindrical styles are also “separable”, which allows the inner and outer races to be mounted separately. The most common styles of Cylindrical Roller bearings and their designations are shown below.
Full complement cylindrical roller bearings do not have cages separating the rollers keeping the rollers from falling out in handling. Types NCF, NNCF, NNCL employ one or two snap rings to make them non-separable so this does not happen. Types NJG and NNC can be separated for installation, but care must be taken with the loose rollers. Lack of a cage allows more rollers for greater load carrying capacity; however, the extra friction of rollers rubbing against each other limits their speed capability. Hence, these bearings are advantageous in those applications with very high loads and low RPMs.
Additional types of Cylindrical Roller Bearings, such as the “AD – SM” and
“AD – D” (4 row), are found in the Rolling Mill Section.
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