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Mitchell Iron & Supply Co.

BALL BEARINGS
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Flange mounted bearings are used when a shaft axis is perpendicular to the bearing mounting surface. Available in 2, 3, or 4-hole configurations, flange mounted bearings provide a method of accurate mounting fits and load support. 2-bolt flanged bearings have a diamond shaped flange with 2 mounting holes.  Most 3-bolt flanged bearings have a circular mounting flange with three, equally spaced mounting holes.  Other hole configurations, such as an offset pattern, are also available.  4-bolt flanged bearings have a square or round mounting flange with four mounting holes.  Selection of the appropriate bearing can be accomplished with knowledge of the shaft size and radial and thrust load requirements. 

Bearing type choices for flange mounted bearings include ball bearing, needle roller bearing, plain bearing, and roller bearing.  In a roller bearing the rolling element is a ball.  Ball bearings are used to provide smooth, low friction motion in rotary applications.  Construction consists of an inner and outer ring, balls, and usually a cage or ball separator.  In a needle roller bearing the rolling element is a needle roller.  Needle roller bearings are designed for radial load applications where a low profile is desired.  Bushings / sleeve bearings, also called journal or plain bearings, are used to constrain, guide, or reduce friction in rotary or linear applications.  They work by means of sliding action as opposed to the rolling action used by ball, roller and needle bearings.  As in all bearings, proper lubrication is required to reduce wear and friction.  Terms such as fluid film, self-lubricated, hydrostatic, and hydrodynamic are commonly designations for plain bearings.  In a roller bearing the rolling element is a roller.  Roller bearings are used to provide smooth, low friction motion in rotary applications.  Construction consists of an inner and outer ring, rollers, and usually a cage or roller separator.  The principal types of roller bearings are cylindrical, spherical, and tapered.  The most common type of flange mounted roller bearing is a spherical roller bearing, which is a self-aligning, double row, combination radial and thrust bearing. 

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Pillow block bearings are mounted bearings that are used to provide load support for a rotating shaft’s axis. Their mounting surface is on a line parallel to the axis of the shaft. Elongated bolt holes in the base or feet of pillow block bearings permit adjustment and easy mounting. Product categories include plain bearings, ball bearings, cylindrical-roller bearings, needle-roller bearings, tapered-rolling bearings, hydrodynamic bearings, and more. With pillow block bearings, product selection is based on shaft size, radial and thrust load requirements, and dimensions and measurements.

Shaft diameter, shaft height, and the distance between bolt holes are the main dimensions for pillow block bearings. Shaft diameter must be matched with the appropriate bore dimensions of the bearing unit. Properly-sized pillow block bearings easily slide onto the shaft and into position, ready to be secured by the locking device. Shaft height or backing height is determined by measuring the distance from the base of a pillow block bearing to the center of the shaft. The distance between bolt-hole centers is taken from the center of one elongated bolt-hole to the center of the housing’s other bolt-hole.

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Mitchell Iron & Supply Co.
217 w 1st Ave
Mitchell SD 57301
Phone (605) 996-2447
   Fax (605) 996-0394
 
Summers Bearing & Supply Co.
250 4th St. NE
Huron SD 57350
Phone (605) 554-0480
Fax (605) 554-0481