The Nº 3311 spring butt hinge is designed to maintain doors in the closed
position. The hinge is UL listed for fire door applications and the tension
is adjustable. It is generally specified for industrial, commercial, and resi-
dential conditions which require doors to be self-closing.
position. The hinge is UL listed for fire door applications and the tension
is adjustable. It is generally specified for industrial, commercial, and resi-
dential conditions which require doors to be self-closing.