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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