Patent ID: 8513173

Claim:
A ball joint comprising a metal ball stud and a synthetic resin seat, wherein said ball joint has a composition sealed therein, wherein said lubricant composition comprises: a 20 to 70 wt % base oil comprising a synthetic hydrocarbon oil selected from the group consisting of poly-α-olefin oil, oligomer of ethylene-α-olefin, and mixtures thereof; a 5 to 25 wt % thickener; and a 20 to 70 wt % fatty acid salt of a compound represented by the formula (1): R 1 —NH—R 2 —NH 2 (1) wherein R 1 is a hydrocarbon group having 1 to 24 carbon atoms, and R 2 is an alkylene group having 2 to 4 carbon atoms; and wherein a coefficient of friction of said lubricant composition is 0.059 to 0.067 at −20° C.