Patent ID: 8251134

Claim:
A header plate assembly for a heat exchanger comprising: a header plate having a tube side and a tank side; and a plurality of apertures extending through the plate; each aperture having a first portion on the tube side of the plate, the first portion having a first cross-dimension, and a second portion adjacent the first portion and having a second cross-dimension that is smaller than the first cross-dimension, a first shoulder being formed between the first and second portions; a plurality of collars, each collar having an aperture extending therethrough; at least one collar including a boss extending outwardly therefrom and having a beveled edge, the aperture of the collar extending through the boss, at least a portion of the boss having the beveled edge being received in the first portion of one of the apertures in the plate; a seal positioned in each of the first portions of the apertures and positioned between one of the beveled edges of the boss and one of the first shoulders; and a fasteners extending through the collars to the plate.