A hinge usually consists of two pieces of metal fitted together and joined by a pin that allows one part of the apparatus to move back and forth. By necessity, outdoor gates require hinge mechanisms that are resistant to the weather, so a hinge might be made from wrought iron, galvanised metal or even stainless steel.
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Pivot hinges, which include the J-bolt hinge, are front face hinges that can be mounted to both the front of the gate and the supporting post. This type of hinge is designed for supporting large, heavy gates. This hinge is composed of a welded plate and sleeve combination that is attached to the vertical post and one heavy-duty bolt, which is bent at a right angle. The smooth end of this bolt slides into the sleeve, while the gate end of the bolt is threaded.
A T-hinge can be made in a decorative wrought-iron style, but also might consist of galvanised metal. This hinge has two parts linked by a solid hinge pin. Typically, the plate, which attaches to the post, is rectangular, and the gate portion is a long piece of metal that end in a point. These hinges vary greatly in height and width, so they are able to support gates of different sizes.
A strap hinge is similar to the T-hinge except that both sections of metal come to a point. This type of hinge will not work if the gate is being hung from a narrow solitary post, because the strap will be too wide. If the post is part of a fence and covered with fencing material, the strap hinge will work fine, provided the hinge is large enough to support the weight of the gate. As with all hinges listed here, the hinge set-up is vertically aligned in pairs, but a third hinge can be added if extra support is needed.
Leaf or Butt Hinge
A leaf or butt hinge consists of two rectangular plates, connected with a sturdy hinge pin. Butt hinges are most often employed to hang an interior or exterior door. These hinges need to be mortised, when installed, even if they are used to hang an outdoor gate. This necessitates using a weather-resistant hinge and hanging the gate so that it does not bind against the support post. As a result, clearances between the gate and post are smaller than what might be found among other kinds of hinges.
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