Viscosity Grade Table ISO 3448

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Viscosity Grade Table ISO 3448

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Fluids Flow Design and Engineering

ISO 3448 Viscosity Grade Table

The ISO viscosity grade (VG) as specified in ISO 3448, is commonly used to classify oils. (See Table 1) Viscosity at 10°F (40°C), the approximate temperature of machinery, in centistokes (same as mm²/s), is used as the index. Each subsequent viscosity grade within the classification has approximately a 50% higher viscosity, whereas the minimum and maximum values of each grade range ±10% from the midpoint.

ISO 3448 viscosity grade	kinematic viscosity at 40°C (cSt)
ISO 3448 viscosity grade	Min.	Midpoint	Max
ISO VG 2	1.98	2.2	2.42
ISO VG 3	2.88	3.2	3.52
ISO VG 5	4.14	4.6	5.06
ISO VG 5	4.14	4.6	5.06
ISO VG 10	9.0	10	11.0
ISO VG 15	13.5	15	16.5
ISO VG 22	19.8	22	24.2
ISO VG 32	28.8	32	35.2
ISO VG 46	41.4	46	50.6
ISO VG 68	61.2	68	74.8
ISO VG 100	90	100	110
ISO VG 150	135	150	165
ISO VG 220	198	220	242
ISO VG 320	288	320	352
ISO VG 460	414	460	506
ISO VG 680	612	680	748
ISO VG 1000	900	1000	1100
ISO VG 1500	1350	1500	1650

Source:

Civil Engineering Reference Manual, Fourteenth Edition
Michael R. Lindeburg, PE