How Many? A Dictionary of Units of Measurement © Russ Rowlett and the University of North Carolina at Chapel Hill

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ISO Viscosity Grades

Data from the web site of C&C Oil Company.

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 of the ISO are the same as those of the ASTM and BSI. The viscosities for the ISO grades are measured at 40 °C, while those of the ASTM and BSI are measured at 100 °F (37.8 °C). Lubricants of a given ASTM or BSI grade are slightly more viscous than lubricants of the corresponding ISO grade.

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March 3, 2000