Gate Hinges
Gate hinges are specifically made to be easily attached to a round fence post, although they can also be used with square posts. A gate hinge has two parts: an L shaped screw or bolt that attaches to the fence post and a leaf with a knurled nut that fits over the L and is screwed to the gate. These hinges may also be called bolt and strap hinges or screw and strap hinges.
Gate hinges are usually available in either five or six inch lengths. Their leaves may decoratively cut, or they may be heavy-duty steel bars for use with heavy gates.
Wood gates with square posts sometimes use other types of hinges, especially face-mounted hinges such as tee hinges, half-strap hinges, and butterfly hinges. Tee hinges are named for their T shape, with the shorter leaf on the post and the longer leaf on the hinge. Half-strap hinges also have a longer leaf on the hinge but the two leaves form a straight line rather than a T. Butterfly hinges, with two equally sized leaves generally in a decorative pattern, may also be used for lighter gates.