ShaftDiameterdiametertolerance (RMA OS-4)NominalDeviationd1overincl.highlowin.in.4+0.003-0.00346+0.004-0.004610+0.005-0.00510+0.006-0.006

Shaft diameterRadial internal clearancefromtomin.max.in.in.1 7/161 1/20.00200.00261 11/1620.00240.00312 3/162 1/20.00300.00372 11/1630.00370.00473 7/1640.00430.0055

Specific bearing load1)Constant KpExponent noverincl.N/mm2–––257700,225904 0000,79030040 0001,21) For inch bearings, specific bearing load may not exceed 150 N/mm2 (table 1).

Number ofbearingsArrangementDesignation suffixFactor3Back-to-back and tandemTBT1,35Face-to-face and tandemTFT1,354Back-to-back and tandemQBT1,55Face-to-face and tandemQFT1,55Tandem back-to-backQBC2Tandem face-to-faceQFC2

Green shading shows the area where ndm ≤ 10,000 [mm/min]. At these lower ndm values, AW or EP additives are needed to reduce wear.Orange shading shows the area where ndm ≥ 500,000 [mm/min] for up to 200 mm bearing mean diameter, and ndm ≥ 400,

Stabilization classStabilized up to-°C°FSN120250S0150300S1200390S2250480S3300570S4350660

Bearing typeBearing boreInterferenceoverincl.–mmµmAngular contactball bearings–500 to 250801 to 3801201 to 41201802 to 51802502 to 62503152 to 73154003 to 8

1)Refer to the SKF traffic light concept.

1)Refer to the SKF traffic light concept.

Bore diameterWidth tolerancesdtΔBs≤ULmmμm18500–4050800–60802500–802503000–100