Bearings and bearing systems not controlled by 2A001 ( ) and 2A101 ( ) : a.  Ball bearings or Solid ball bearings, having tolerances specified by the manufacturer in accordance with ABEC 7, ABEC 7P, or ABEC 7T or ISO Standard Class 4 or better (or equivalents) and having any of the following characteristics; 1.  Manufactured for use at operating temperatures above 573 K (300 o C) either by using special materials or by special heat treatment; or 2.  With lubricating elements or component modifications that, according to the manufacturer’s specifications, are specially designed to enable the bearings to operate at speeds exceeding 2,3  million ‘DN’; b.  Solid tapered roller bearings, having tolerances specified by the manufacturer in accordance with ANSI/ABMA Class 00 (inch) or Class A (metric) or better (or equivalents) and having either of the following characteristics: 1.  With lubricating elements or component modifications that, according to the manufacturer’s specifications, are specially designed to enable the bearings to operate at speeds exceeding 2,3  million ‘DN’; or 2.  Manufactured for use at operating temperatures below 219 K (-54 o C) or above 423 K (150 o C); c.  Gas-lubricated foil bearing manufactured for use at operating temperatures of 561 K (288 o C) or higher and a unit load capacity exceeding 1 MPa; d.  Active magnetic bearing systems; e.  Fabric-lined self-aligning or fabric-lined journal sliding bearings manufactured for use at operating temperatures below 219 K (-54 o C) or above 423 K (150 o C).

Balls, needles and rollers

Program information