Lubrication of Industrial Enclosed Gear Drives| Rust and Oxidation Inhibited Gear Oils | Viscosity Range (a) | Equivalent ISO Grade (a) | Extreme Pressure Gear Lubricants (b) |
|---|
| AGMA Lubricant No. | cSt(mm2/s) at 40oC | | AGMA |
| 1 | 41.4 to 50.6 | 46 | - |
| 2 | 61.2 to 74.8 | 68 | 2 EP |
| 3 | 90 to 110 | 100 | 3 EP |
| 4 | 135 to 165 | 150 | 4 EP |
| 5 | 198 to 242 | 220 | 5 EP |
| 6 | 288 to 352 | 320 | 6 EP |
| 7 Comp(c) | 414 to 506 | 460 | 7 EP |
| 8 Comp(c) | 612 to 748 | 680 | 8 EP |
| 8A Comp(c) | 900 to 1100 | 1000 | 8A EP |
| | | | |
| (a) "Industrial Liquid Lubricants - ISO Viscosity Classification." International Standard, ISO 3448. Also ASTM D2422 and British Standards Institution BS 4231. | | | |
| (b) Extreme pressure lubricants should be used only when recommended by the gear drive manufacturer. | | | |
| (c) Oils marked Comp are compounded with 3% to 10% fatty or synthetic fatty oils. | | | |
