Machinery's Handbook, 31st Edition
Viscosity
2505
Table 2. Viscosity Comparison Chart
40 C 100 C Centistokes
ISO VG Grades
AGMA Grades
SAE Grades
SUS
Engine
Gear
100 F 210 F
2000 1500
350 300
70 60
8000
1500
9
6000 5000 4000 3000 2500 2000
250
250
1000 800
1000 8A
50
200 180 160 140
40
680
8
600 500 400
140
460
7
30
120
60
320
6
1500
300
100 90 80 70
20 18 16 14 12 10 9 8 7 6
50
220
5
90
1000 800
200 150
150
4
40
600 500 400 300 250 200 160 140 120 100
85W
100
3
100 80
30
60 55
68
2
80W
60 50 40
50
20
46
1
45
75W
32
30
5
10W
22
40
20
4
5W
80 70
15
15
3
35
10
60
Viscosities based on 95VI single grades relate horizontally. SAE grades specified at 100 °C. SAE W grades are also specified at low temperatures. ISO and AGMA Grades specified at 40 °C.
SAE - Society of Automotive Engineers (Automotive lubricants) AGMA - American Gear Manufacturers Assn. (Gear lubricants) ISO - International Standards Organization SUS - Saybolt Universal Seconds
Viscosity Index (VI): Viscosity is dependent on temperature. As oil heats up it becomes thinner or less viscous. Inversely, as oil cools down it becomes thicker or more viscous. This phenomenon dictates that all oils will change their physical properties once they have achieved their working environment temperature. Therefore, before a lubricant viscosity choice can be made, its expected working environment temperature must be known. To engineer for this phenomenon, oil is given a Viscosity Index , or VI rating, which defines the measure of a lubricant’s viscosity change due to temperature change. Higher VI ratings are more desirable, reflecting narrower viscosity change over a standard tem - perature range. To determine a specific oil’s VI rating, its kinematic viscosity is measured
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