Taper entry is the basic material index indicating grease hardness, which is usually divided into nine grades: 000 # (445-475), 00 # (400-430), 0 # (355-385), 1 # (310-340), 2 # (265-295), 3 # (220-250), 4 # (174-205), 5 # (130-160), 6 # (85-115)