super precision bearings

Shafts and Housings for Angular Contact Thrust Ball Bearingsfor 2344, 2347Tolerance Recommendations for Machining the Shafts for Double Row Angular Contact Thrust Ball Bearings for Main Spindles (2344.., 2347..)Dimensions in mmNominal shaft over 18 30 50 80 120 180 250 315 400diameter including 30 50 80 120 180 250 315 400 500Tolerance Class SP Tolerances in µmDeviation of d 0 0 0 0 0 0 0 0 0-6 -7 -8 -10 -12 -14 -16 -18 -20Cylindricity t 1 1 1 1.2 1.5 2 3 4 5 6Flatness t 3 1 1 1.2 1.5 2 3 4 5 6Axial runout t 4 1.5 1.5 2 2.5 3.5 4.5 6 7 8Mean surface roughness R a 0.2 0.2 0.4 0.4 0.4 0.4 0.8 0.8 0.8Tolerance Class UP Tolerances in µmDeviation of d 0 0 0 0 0 0 0 0 0-4 -4 -5 -6 -8 -10 -12 -13 -15Cylindricity t 1 0.6 0.6 0.8 1 1.2 2 2.5 3 4Flatness t 3 0.6 0.6 0.8 1 1.2 2 2.5 3 4Axial runout t 4 1 1 1.2 1.5 2 3 4 5 6Mean surface roughness R a 0.2 0.2 0.2 0.2 0.2 0.2 0.4 0.4 0.4Tolerance Recommendations for Machining the Housings for Double Row Angular Contact Thrust Ball Bearings for Main Spindles (2344.., 2347..)Dimensions in mmNominal housing over 30 50 80 120 180 250 315 400 500 630diameter D including 50 80 120 180 250 315 400 500 630 800Tolerance Class SP Tolerances in µmDeviation of D +2 +3 +2 +3 +2 +3 +3 +2 0 0-9 -10 -13 -15 -18 -20 -22 -25 -30 -35Cylindricity t 1 1.5 2 2.5 3.5 4.5 6 7 8 9 10Flatness t 3 1 1.2 1.5 2 3 4 5 6 7 8Axial runout t 4 1.5 2 2.5 3.5 4.5 6 7 8 9 10Mean surface roughness R a 0.8 0.8 0.8 0.8 0.8 1.6 1.6 1.6 1.6 1.6Tolerance Class UP Tolerances in µmDeviation of D +1 +1 +1 +1 0 0 +1 0 0 0-6 -7 -9 -11 -14 -16 -17 -20 -24 -28Cylindricity t 1 1 1.2 1.5 2 3 4 5 6 7 8Flatness t 3 0.6 0.8 1 1.2 2 2.5 3 4 5 6Axial runout t 4 1 1.2 1.5 2 3 4 5 6 7 8Mean surface roughness R a 0.2 0.4 0.4 0.4 0.4 0.8 0.8 0.8 1.6 1.6EngineeringFAG · 169