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Glossary

  • A.B.E.C. – Annular Bearing Engineering Committee. Used as prefix for tolerance grades of bearings as set up by this committee.
  • A.B.E.C. 1-3-5-7-9 – Annular Bearing Engineers Committee classes or grades of ball bearing precision.
  • A.F.B.M.A. – The Anti-Friction Bearing Manufacturers Association. They have set up standards for the bearing industry.
  • Adapter Assembly – Assembly consisting of adapter sleeve, locknut and lockwasher.
  • Adapter Sleeve – Axially slotted sleeve with cylindrical bore, tapered outside surface and male screw thread at small end used with locknut and lockwasher for mounting of
  • Aircraft Bearing – A term applied generally to bearings used by the aircraft industry or the Air Force.
  • Airframe Bearing – A bearing designed for use in the control systems and surfaces of aircraft.
  • Angular Contact Bearing – A type of ball bearing whose internal clearances and ball race locations are such as to result in a definite contact angle between the races and the balls when
  • Annular Ball Bearing – A rolling element bearing designed primarily to support a load perpendicular to the shaft axis. Also: Radial Type Bearing.
  • Anti-friction Bearing – Commonly used term for rolling element bearing.
  • Axial – In the same direction as the axis of the shaft.
  • Axial Internal Clearance – In ball or roller bearing assembly, total maximum possible movement parallel to bearing axis of inner ring in relation to outer ring. Also called bearing end
  • Axis – An imaginary line running through the centre of a shaft on which a bearing is mounted.
  • Ball – A spherical rolling element.
  • Ball Bearing – A bearing using balls as the rolling elements.
  • Ball Cage – A device which partly surrounds the balls and travels with them, the main purpose of which is to space the balls. Also Separator: Retainer: Ball Spacer.
  • Ball Complement – Number of balls used in a ball bearing.
  • Ball Diameter – The dimension measured across the ball centre.
  • Ball Pocket – A drilled, stamped, or moulded receptacle that holds the ball in a cage.
  • Basic Dynamic Load Rating – Basic dynamic load rating, Cr, is the calculated constant radial load (thrust load for thrust bearings) which a group of identical bearings with stationary
  • Bore – The smallest internal dimension of inner or outer ring or separator. Also, the surface of the inner ring that fits against the shaft.
  • Boundary Dimensions – Dimensions for bore, width, outside diameter and corner radius.
  • Cage – See Ball Cage.
  • Cam Follower – See Track roller
  • Cartridge Bearing – An extra wide double shielded or sealed bearing designed to increase grease capacity of bearing.
  • Concentric – Having the same centre.
  • Cone – Inner ring of tapered roller bearing.
  • Conrad – Standard single row deep-groove bearing named for the inventor of its assembly method, Joseph Conrad.
  • Contact Angle – Formed by a line drawn between the areas of ball and ring contact and a line perpendicular to the bearing axis.
  • Counterbored Ball Bearing – Portion of one race shoulder turned and ground away to facilitate assembly with a greater number of balls. A non-separable ball bearing with one side of the
  • Double Row Bearing – A bearing with two rows of rolling elements.
  • Double Row Maximum Capacity – A bearing that has a solid inner and outer with two raceways and filling notches to permit the maximum number of balls to be inserted.
  • Drawn Cup Needle Roller Bearing – Needle roller radial bearing with thin pressed steel outer ring (drawn cup), which may have one closed end or both ends open. Usually employed without inner ring
  • Duplex Bearing – A duplex bearing is a bearing with controlled axial location of faces of inner and outer rings which makes this bearing suitable for mounting in various
  • Dynamic Load – A load exerted on a bearing in motion.
  • Eccentric – Not having the same centre.
  • End Play – The axial play of the outer ring in a bearing. The measured maximum possible movement parallel to bearing axis of the inner ring in relation to outer ring.
  • External Race – The ball path on an inner ring. Also – Inner Raceway, Inner Ring Raceway.
  • Face – The side surface of a bearing. See also Thrust Face.
  • Fillet Radius – The corner dimension in a bearing housing that the bearing external corner radius or chamfer must clear.
  • Filling Notch – A slot or notch cut in the shoulder of a ring to allow the loading of the maximum number of balls. Also Filling Notch; Loading Groove.
  • Finish – A term usually applied to the last machining operation on any surface of a bearing, such as “Finish O.D., ” “Finish bore, ” etc.
  • Fit – The amount of internal clearance in a bearing. Fit can also be used to describe shaft and housing size and how they relate to the bore or outside diameter.
  • Fixed Bearing – Bearing which positions shaft against axial movement in both directions.
  • Floating Bearing – Bearing designed or mounted so as to permit axial displacement between shaft and housing.
  • Full Complement Bearing – Rolling bearing without cage in which sum of clearances between rolling elements in each row is less than the diameter of rolling elements and small enough to give
  • Hardening – Process of heating parts to a high temperature and then quenching in oil, water, air, or solution.
  • Heading Rivets – Process of hitting rivets in a press to form the heads.
  • Housing Fit – Amount of interference or clearance between bearing outside surface and housing bearing seat.
  • Housing, Bearing – The opening in which a bearing is contained in a machine. The part of a machine that contains this opening.
  • Hydraulic Nut – Collar temporarily fixed to shaft which incorporates hydraulic annular piston to transmit axial mounting or dismounting force to bearing inner ring.
  • Inch Dimension Bearing – A bearing having boundary dimensions made to integral or/and fractional inch figures rather than metric figures.
  • Inner – See Inner Ring
  • Inner Ring – The inner part of a bearing that fits on a shaft and contains the external raceway for the rolling elements. Sometimes the shaft is stationary and the housing rotates
  • Inner Ring Raceway – See External Race.
  • Internal Clearance – See Radial Clearance.
  • Internal Race – The ball or roller path on the bore of the outer ring. Outer Ring Raceway. Outer Raceway.
  • ISO – International Standards Organization.
  • Land – Commonly called the O.D. of the inner and the I.D. of the outer.
  • Lapping – An abrading process for refining the surface finish and the geometrical accuracy of a surface.
  • Life – “Life” of individual rolling bearing is the number of revolutions (or hours at some given constant speed) which bearing runs before first evidence of fatigue
  • Limits – Maximum and minimum allowable dimensions, resulting from the application of predetermined tolerances to a specified dimension.
  • Lock Nut – A nut used in combination with a lock washer to hold a bearing in place on a shaft.
  • Lock Washer – A washer with tongue and prongs to hold a lock nut in place.
  • Locking Collar, Concentric – Ring fitting over extended inner ring of insert bearing and having setscrews which pass through holes in inner ring to make contact with shaft.
  • Locking Collar, Self – Ring having recess on one side which is eccentric in relation to bore and fits over equally eccentric extension of inner ring insert bearing. Collar is turned in
  • Loose Fit – A fit or fit up of inner ring, balls, and outer ring which results in the existence of appreciable radial clearance.
  • Maximum Capacity Bearing – A bearing with filling notches to allow the loading of the maximum number of balls.
  • Misalignment – Lack of parallelism between axis of rotating member and stationary member.
  • Needle Roller – Cylindrical roller of small diameter with large ration of length to diameter. Generally accepted that length is between three and ten times diameter which is usually
  • O.D. – Outer Diameter; Outside Diameter.
  • Outer – See Outer Ring.
  • Outer Raceway – See Internal Race.
  • Outer Ring – The outer part of a bearing that fits into the housing and contains the internal raceway for the rolling elements.
  • Outer Ring Raceway – See Internal Race.
  • Pocket – The portion of a cage shaped to hold the ball or roller. Also Ball Pocket; Roller Pocket.
  • Preload – An internal loading characteristic in a bearing which is independent of any external radial and/or axial load carried by the bearing.
  • Pre-lubricated Bearing – A shielded, sealed, or open bearing originally lubricated by the manufacturer.
  • Raceway – The ball or roller path; cut in the inner and outer ring in which the balls or rollers ride. Also Guide Path; Race; Ball Path; Roller Path.
  • Raceway Diameter – Inner Ring — the outer dimension across the diameter from raceway bottom to raceway bottom.
  • Radial Clearance – The radial internal clearance of a single row radial contact ball bearing is the average outer ring race diameter, minus the average inner ring race diameter, minus
  • Radial Load – A load exerted perpendicular to the axis.
  • Radial Play – See Radial Clearance.
  • Radial Type Bearing – In general, a rolling element bearing primarily designed to support load perpendicular to the axis. Also: Annular Bearing.
  • Rating Life – L10 of group of apparently identical bearings is the life in millions of revolutions that 90% of the group will complete or exceed.
  • RBEC-1, -5 – Class or degree of precision of anti-friction roller bearings.
  • Relieved End Roller – Roller with slight modification of diameter at ends of outside surface to reduce stress concentration at contacts between rollers and raceways.
  • Retainer – See Ball Cage.
  • Riveted Type Ball Cage – A type of cage in which the two halves are riveted together around the balls after the balls have been assembled in the rings.
  • Runout, of Assembled Bearing – Displacement of surface of bearing relative to fixed point when one raceway is rotated with respect to other raceway.
  • Seal – A soft synthetic rubber washer with a steel core fixed in the outer ring (in the seal groove) in contact with the inner ring to retain lubricant and keep out
  • Self Aligning Ball Bearing – Spherical outside diameter ball bearing which can accommodate initial angular misalignment between the outer ring and its mating spherical aligning ring or housing seat.
  • Separable – A bearing that may be separated completely or partially into its component parts.
  • Separator – See Ball Cage.
  • Shaft Fit – Amount of interference or clearance between bearing inside diameter and shaft bearing seat outside diameter.
  • Shield – A metal formed washer attached to the outer ring and set so it rides close to, but not contacting, the inner ring, to retain lubricant and prevent contamination.
  • Shoulder – The side of a ball race, also a surface in a bearing application or shaft which axially positions a bearing and takes the thrust load.
  • Single Row – Bearing with one row of rolling elements.
  • Snap Ring – A removable ring used to axially position a bearing or outer ring in a housing. Also used as a means of fastening a shield or seal in a bearing.
  • Solid Cage – A solid ring type separator used in a radial or angular contact type bearings.
  • Spacer – Sleeve or sleeves serving to space different bearings on same shaft or different rows of rolling elements in multi-roll bearing.
  • Spherical Roller Bearing – Self-aligning, radial rolling bearing with convex rollers or concave rollers as rolling elements. With convex rollers outer ring has spherical raceway, with concave
  • Standard Bearing – Bearing which conforms to the basic plan for boundary dimensions of metric or inch dimensions.
  • Static Load – A load exerted on a bearing not in motion.
  • Stay Rod – A flat elongated rivet used in the cages of maximum capacity bearings.
  • Stay Rod Type Ball Cage – Type cage in which the two halves are held together with special stay rod rivets.
  • Thrust Bearing – A bearing designed primarily for thrust loads.
  • Thrust Face – Face of thrust bearing against which housing or shaft shoulder pushes.
  • Thrust Load – See Axial Load.
  • Tolerance – The range between two limiting sizes as a means of specifying the degree of accuracy.
  • Track Roller – Radial roller bearing with heavy section outer ring, intended to roll on track, a.k.a. cam follower.
  • Wide Inner Ring Bearing – Bearing with inner ring extended on one or both sides in order to achieve greater shaft support and permit addition of locking device and provide additional space for
  • Withdrawal Sleeve – Axial slotted sleeve with cylindrical bore, tapered outside surface and male screw thread at large end. Used for mounting and dismounting (by means of nut) of bearing

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