ASTM D217-19a
- Standard Test Methods for Cone Penetration of Lubricating Grease
- standard by ASTM International, 07/01/2019
- Category: ASTM
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1.1 These test methods cover four procedures for measuring the consistency of lubricating greases by the penetration of a cone of specified dimensions, mass, and finish. The penetration is measured in tenths of a millimetre.
Note 1: The National Lubricating Grease Institute (NLGI)2 classified greases according to their consistency as measured by the worked penetration. The classification system is as follows:
| NLGI | Worked Penetration Range, |
| 000 | 445 to 475 |
| 00 | 400 to 430 |
| 0 | 355 to 385 |
| 1 | 310 to 340 |
| 2 | 265 to 295 |
| 3 | 220 to 250 |
| 4 | 175 to 205 |
| 5 | 130 to 160 |
| 6 | 85 to 115 |
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