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Industrial Lubricants - Viscosities vs. ISO-VG Grade

ISO-VG viscosity grades for industrial lubricants.

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The diagram below indicates the minimum and maximum viscosities in centistokes for equivalent ISO-VG grades at temperature 40oC.

Lubricants - Iso-vg grade viscosity diagram

ISO VG stands for "International Standards Organization Viscosity Grade" and is a number ranged from 2 to 1500. 

Equivalent Viscosity of ISO-VG Grades at 40oC and SAE Crankcase Oil Grades

ISO-VG GradeSAE Crankcase Oil Grade
22 5W
32 10W
46 15W
68 20W
100 30
150 40
220 50
320 60

Equivalent Viscosity of ISO-VG Grades at 40oC and SAE Aircraft Oil Grades

ISO-VG GradeSAE Aircraft Oil Grade
100 65
150 80
220 100
320 120

Equivalent Viscosity of ISO-VG Grades at 40oC and SAE Gear Lube Grades

ISO-VG GradeSAE Gear Lube Grade
46 75W
100 80W-90
220 90
460 85W-140
1500 250

Equivalent Viscosity of ISO-VG Grades at 40oC and AGMA Gear Lube Grades

ISO-VG GradeAGMA Gear Lube Grade
46 1
68 2 2 EP
100 3 3 EP
150 4 4 EP
220 5 5 EP
320 6 6 EP
460 7 7 EP
680 8 8 EP

ISO-VG Grades and Temperature

Lubricants - Iso-vg temperature absolute viscosity diagram

  • tC = 5/9(tF - 32)
  • tF = 9/5 tC + 32
  • 1 reyns (lb s/in2) = 6896.55 (Pa s)
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  • Engineering ToolBox, (2008). Industrial Lubricants - Viscosities vs. ISO-VG Grade. [online] Available at: [Accessed Day Mo. Year].

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