Abstract: The description relates to a contact spring arrangement. The contact springs have contact heads (2) each having a convex contact surface and two side surfaces. According to the invention, recesses (7, 17, 18) are embossed in the surfaces of the contact head, with the result that the contact surfaces (4) are smoothed and made wider.

Abstract: A connector is described, of the type that has a plastic housing with pegs (15, FIG. 2 ) that project through round holes (16) in a circuit board to hold the connector in place, wherein the pegs are shaped to minimize warping of the circuit board and facilitate construction of the pegs. Each peg has an axis (27) and has at least three vertical interference ridges (17-20) each spaced from the axis by slightly more than the radius of the circuit board holes, with the outer surface (28) of each ridge having about the same radius of curvature as that of the board holes. The outer surface of each peg preferably extends by an angle A of at least 15.degree. about an imaginary circle (32) centered on the axis, with the ridges connected by straight sides (21-24), with the straight sides lying on an imaginary regular polygon such as a square (29). Each peg can have a cylindrical lower portion (30, FIG. 4 ) extending below the ridges and closely received in the hole to assure alignment of the ridges with the hole.