is an automotive lubricating grease quality levels established jointly by SAE, ASTM, and NLGI. There are two categories: Chassis Lubricants and Wheelbearing Lubricants. Quality or performance levels within each category are defined by ASTM tests.

NLGI Grease Classification
NLGI Grade	ASTM Worked Penetration at 25°C (77°F)	Consistency
000	445 - 475	Semi-fluid
00	400 - 430	Semi-fluid
0	355 - 385	Very Soft
1	310 - 340	Soft
2	265 - 295	Common Grease
3	220 - 250	Semi-Hard
4	175 - 205	Hard
5	130 - 160	Very Hard
6	85 - 115	Solid