GREASE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide means capable of practically preventing or reducing generation of seizure even with long-term use and/or maintaining the friction coefficient in a low range at a fitted part of a hobbed spline part.SOLUTION: The present invention relates to a grease composition containing: a base oil having kinetic viscosity in the range of 100 to 300 mm/s at 40°C; a thickener made of a diurea compound represented by formula (I), where Rand Rare each independently a Cto Calkyl; and an additive made of a true spherical polymer having an average particle diameter of 5μm or less.