Patent ID: 7005177

Claim:
A friction mating member comprising a base member and a hard coating applied on the base member, said coating having an outer surface, wherein the hard coating has a load point displacement characteristic in which the ratio of elastic deformation to maximum indentation depth, in a load range of 1 to 50 mN, is at least 50%, wherein semispherical protrusions, having diameters in the range of 1 to 5 μm, are formed on said outer surface of said hard coating, the ratio of the area occupied by said protrusions to the total area of said outer surface of said hard coating is at least 3%, the arithmetic average surface roughness Ra of said outer surface of said hard coating, excluding the semispherical protrusions, is in the range of 4 to 50 nm, and the arithmetic average surface roughness Ra of the base member is not greater than 0.07 μm.