FAG Machine Tool Spindle Bearing Dimensions and Geometric Tolerance Measurement Method

Dimensional and geometrical tolerances Unless otherwise specified, the tolerances for FAG radial rolling bearings are in accordance with DIN 620-2 (ISO 492) and the tolerances for thrust rolling bearings are in accordance with DIN 620-3 (ISO 199), Figure 1. The accuracy class is PN. For higher precision bearings, tolerance values u200bu200bare limited to P6, P5, P4 and P2. Data sheets for the individual tolerance classes can be found on pages 29 to 32. FAG high-precision bearings High-precision bearings do not use standard tolerance classes, but are produced according to tolerance classes P4S, SP and UP. These tolerances are listed in the product description of the JAF Precision Bearings catalogue, see TPI120, High Precision Bearings Undergoing Combined Loads. Measuring method Rolling bearings are tested according to DIN 620-1 and ISO 1132-2. More detailed information on measuring methods is given in brochure TPI138, THK Rolling Bearings Tolerances, Definitions and Measurement Guidelines. Catalogs of TPI bearings can be ordered via the Internet. FAG Machine Tool Spindle Bearings Tolerance Symbols and Definitions Tolerance Symbols Tolerance Characteristics in accordance with DIN 1132 and DIN 620 d Bearing Nominal Bore Diameter dmp Deviation of the Average Bore Diameter in a Single Plane d1mp Deviation of the Mean Diameter of the Large End of the Tapered Bore Vdsp in a Single Plane Bore diameter variation Vdmp Average inner hole diameter variation D Bearing nominal outer diameter Dmp Average outer diameter deviation in a single plane VDsp Single outer diameter variation in a single plane VDmp Average outer diameter variation B Nominal inner ring width Bs Single inner ring width deviation VBs Inner ring width variation C Nominal outer ring width Cs Single outer ring width deviation VCs Outer ring width variation Kia Complete bearing inner ring radial runout Kea Complete bearing outer ring radial runout Sd Inner ring end to inner hole Runout SD The runout of the bus bar on the outer surface of the outer ring to the reference end face Sia Axial runout of the inner ring of the bearing set Sea Axial runout of the outer ring of the bearing set Si Thickness variation of the shaft washer Se Thickness variation of the seat ring T One-way thrust bearing nominal Height T Tapered roller bearing assembly height