A connector for orthodontic headgear includes a casing for a helical compression spring one end of which engages the head of a rod extending through the spring. The other end of the spring engages a sleeve supported in an aperture in the end of the casing. Such casing aperture has a straight chordal portion and the sleeve has axially spaced circumferential flanges with chordally truncated portions for enabling the sleeve to be moved axially relative to the casing flange when in one rotative position for adjusting the spring force and rotatively adjustable relative to the casing flange to hold the sleeve in a selected adjusted position. The connection is disconnectible by providing a metal clip securable to a headcap having legs engageable in grooves in the casing.