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          Carbon steelballquality standards JB5301-1991
          Scope: carbon steel ball bearings and other uses    
          units:μm

          Grade
          Number of averagedia.deviation
          Spherical error
          Ball diameter variation
          lot dia. Variation
          Surface roughness
          Upper deviation
          lower deviation
          100
          40
          -40
          2.5
          2.5
          5
          0.125
          200
          60
          -60
          5
          5
          10
          0.2
          500
          80
          -80
          12.5
          12.5
          25
          1000
          100
          -100
          25
          25
          50

          Carbon steelballmachining precision between100G~1000G。
          Production specificationsΦ1.5mm~Φ30mm
          according to customer requirements to do other non-standard specifications carbon steel ball.
          Carbon steel ball diameter selection table

          公 稱
          直 徑
          公 稱
          直 徑
          公 稱
          直 徑
          1.5mm
          1.5000
          17/64
          6.7469
          16mm
          16.000
          1/16
          1.5875
          9/32
          7.1438
          21/32
          16.6688
          2mm
          2.0000
          7.5mm
          7.5000
          11/16
          17.4625
          3/32
          2.3812
          5/16
          7.9375
          18mm
          18.000
          2.5mm
          2.5000
          8mm
          8.0000
          23/32
          18.2563
          3mm
          3.0000
          8.5mm
          8.5000
          3/4
          19.0500
          1/8
          3.1750
          11/32
          8.7313
          25/32
          19.8438
          3.5mm
          3.5000
          3/8
          9.5250
          20mm
          20.000
          9/64
          3.5719
          10mm
          10.000
          13/16
          20.6375
          5/32
          3.9688
          13/32
          10.3188
          27/32
          21.4313
          4mm
          4.0000
          7/16
          11.1125
          7/8
          22.225
          4.5mm
          4.5000
          15/32
          11.9063
          29/32
          23.0188
          3/16
          4.7625
          1/2
          12.7
          15/16
          23.8125
          5mm
          5.0000
          13mm
          13.000
          31/32
          24.6063
          5.5mm
          5.5000
          17/32
          13.4938
          25mm
          25.000
          7/32
          5.5563
          14mm
          14.000
          1吋
          25.400
          15/64
          5.9531
          9/16
          14.2875
          1-1/16
          26.9875
          6mm
          6.0000
          15mm
          15.000
          1-1/8
          28.575
          1/4
          6.3500
          19/32
          15.0813
          30mm
          30.000
          6.5mm
          6.5000
          5/8
          15.875
          1-3/16
          30.1625

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