Интервалы
| Для квалитетов
| номинальных
| 9-го
| 10-го
| 11-го
| 12-го
| 13-го
| 14-го
| 15-го
| размеров, мкм
| IT
| σ
| IT
| σ
| IT
| σ
| IT
| σ
| IT
| σ
| IT
| σ
| IT
| σ
| До 3
| 25
| 6
| 40
| 8
| 60
| 12
| 100
| 20
| 140
| 30
| 250
| 50
| 400
| 80
| Св. 3 до 6
| 30
| 8
| 48
| 10
| 75
| 16
| 120
| 30
| 180
| 40
| 300
| 50
| 480
| 100
| Св. 6 до 10
| 36
| 9
| 58
| 12
| 90
| 18
| 150
| 30
| 220
| 50
| 360
| 80
| 580
| 120
| Св. 10 до 18
| 43
| 10
| 70
| 14
| 110
| 30
| 180
| 40
| 270
| 60
| 430
| 90
| 700
| 140
| Св. 18 до 30
| 52
| 12
| 84
| 18
| 130
| 30
| 210
| 50
| 330
| 70
| 520
| 120
| 840
| 180
| Св. 30 до 50
| 62
| 16
| 100
| 20
| 160
| 40
| 250
| 50
| 390
| 80
| 620
| 140
| 1000
| 200
| Св. 50 до 80
| 74
| 18
| 120
| 30
| 190
| 40
| 300
| 60
| 460
| 100
| 740
| 160
| 1200
| 240
| Св. 80 до 120
| 87
| 20
| 140
| 30
| 220
| 50
| 350
| 70
| 540
| 120
| 870
| 180
| 1400
| 280
| Св. 120 до 180
| 100
| 30
| 160
| 40
| 250
| 50
| 400
| 80
| 630
| 140
| 1000
| 200
| 1600
| 320
| Св. 180 до 250
| 115
| 30
| 185
| 40
| 290
| 60
| 460
| 100
| 720
| 160
| 1150
| 240
| 1850
| 380
| Св. 250 до 315
| 130
| 30
| 210
| 50
| 320
| 70
| 520
| 120
| 810
| 180
| 1300
| 260
| 2100
| 440
| Св. 315 до 400
| 140
| 40
| 230
| 50
| 360
| 80
| 570
| 120
| 890
| 180
| 1400
| 280
| 2300
| 460
| Св. 400 до 500
| 155
| 40
| 250
| 50
| 400
| 80
| 630
| 140
| 970
| 200
| 1550
| 320
| 2500
| 500
| |