Class 4\2 precision deep groove ball bearings, angular contact ball bearings and tapered roller bearings and shaft matching bearing Nominal outer diameter d/mm 4 class 2 exceeds the journal tolerance zone 18120Js4, h4 (preload) Js3, h3 (Preload) 120250K4Js3, h3 (Preload) Level 4\2 precision deep groove ball bearings, angular contact ball bearings and tapered roller bearings match the housing hole, whether the bearing type is axially moving, level 4, level 2 housing hole tolerance With deep groove ball bearings, angular contact ball bearings floating H5H4 fixed JS5JS4 tapered roller bearings floating H5H4 fixed K5K4 tapered bore double row cylindrical roller bearings K5K4 Class 2 precision deep groove ball bearings, angular contact ball bearings and tapered roller bearings Interference with the shaft (um) The speed factor of the bearing Dn≦the nominal inner diameter of the bearing/um 18-3030-5050-8080-120 Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum 200 0000+30+4+1+5+1+ 6400 0000+20+20+20+3800 000-1+1-1+1-1+1-- Note: + means interference,-means clearance level 2 precision deep groove ball bearings, angular contact ball bearings and tapered rollers The clearance between the sub-bearing and the bearing hole (um) The speed factor of the bearing Dn≦the nominal outer diameter of the bearing/um30-5050-8080-120120-180 Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum Deep Groove Ball Bearings and Angular Contact Ball Bearings 100 000-4+4-5+5-6+6-7+7200 000-1+5-1+6-1+7-1+9400 0000+40+50+60+7800 000+1+3+1 +3+1+4--Double row cylindrical roller bearings and tapered roller bearings 100 000-6+2-7+2-8+3-9+3200 000-4+4-4.5+4.5-5+5 -6+6300 000-2+6-2+7-3+8-3+9 Note 1:-means clearance, + means interference 2: For bearings with higher support rigidity and vibration resistance, the above Choose a tighter fit within the clearance range, 3: For bearings with a particularly high speed, in order to reduce the vibration caused by the imbalance of the spindle components, a tighter fit should also be selected