International Organization for

Standardization (ISO)Viscosity

Classification System for Industrial

Fluid Lubricants

ISO Viscosity Grade Numbers

Viscosity Grade Ranges

Centistokes at 40° C

Minimum

Maximum

2

3

5

7

10

15

22

32

46

68

100

150

220

320

460

680

1000

1500

1.98

2.88

4.14

6.12

9.00

13.5

19.8

28.8

41.4

61.2

90.0

135

198

288

414

612

900

1350

2.42

3.52

5.06

7.48

11.0

16.5

24.2

35.2

50.6

74.8

110

165

242

352

506

748

1100

1650

Note: The viscosity grade numbers for the ISO System are identical to those shown for the ASTM / BSI System (in centistokes). The viscosity of the ISO grades, however, is measured at 40° C instead of 100° F (37.8° C), which results in a slightly more viscous lubricant for each corresponding grade.

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