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Choosing Hinges for Heavy Traditional Gates
A heavy traditional gate needs hinges chosen by the load they carry, not by looks alone. Strap hinges, pin hinges and bearing hinges each suit a different weight and style, and the right pick depends on the leaf, the post and the way the gate is used. A hinge rated well above the leaf weight, fastened to a solid post, keeps a heavy gate swinging smoothly for decades.
Know the weight of the leaf
Start by finding out what the gate actually weighs. A fabricator can calculate it from the length and section of the steel, or the gate can be weighed on a scale before it is hung. A four foot wide gate of solid square bar can weigh well over a hundred pounds, and a tall estate leaf can weigh several hundred. Weight decides everything that follows, and guessing is the most common reason hinges fail early.
Remember that the hinges do not carry the weight evenly. The bottom hinge supports most of the downward load, and the top hinge resists the pull that tries to tear the gate away from the post. Both loads grow with the width of the leaf, since a wide gate acts like a long lever.
Strap hinges
A strap hinge has a long flat arm that lies across the face of the gate and spreads the load over a wide area. It looks traditional and suits gates with a rustic or period character. Straps work well on wood and on lighter metal gates, where the long arm prevents the fasteners from tearing out. On a heavy steel gate, a strap can be welded in place along its length.
The strap should be long enough to reach well into the leaf, typically a third of the gate width or more. A short strap on a wide gate concentrates the load at the end and invites a crack. Thickness matters as well, and a strap that flexes under load will let the leaf sag.
Pin hinges
A pin hinge uses a vertical pin on the post that fits into a socket on the leaf. The gate lifts off the pin for removal, which is useful for repair and painting. Pin hinges carry heavy loads well, because the weight bears straight down on the pin and the post. They are common on large gates, farm gates and estate gates, and their simple form fits traditional designs.
A pin hinge needs the pin and socket aligned precisely. If the top and bottom pins are not in a straight line, the gate binds as it swings. Use a plumb line or a straight edge across the pins before welding or bolting them in place, and adjust until the leaf swings freely through its whole range.
Bearing hinges
A bearing hinge has a ball or thrust bearing between the knuckles, so the weight rides on a bearing instead of grinding metal on metal. These hinges swing with very little effort, even under heavy loads, and they wear far more slowly than plain hinges. They suit very heavy gates, and gates that are opened many times a day.
Many bearing hinges are adjustable, allowing the leaf to be raised or lowered after installation. This is valuable on heavy gates, since the posts will settle over the years and the leaf needs to be tuned to follow. Sealed bearings last longest outdoors, and a hinge with a grease fitting can be serviced every year.
Number and spacing
Two hinges are standard for most gates, but a tall or heavy leaf may need three. The farther apart the top and bottom hinges are, the less force each has to resist, because the lever arm is longer. Place the top hinge near the top rail and the bottom hinge near the bottom rail, with a third in the middle if the leaf is more than six feet tall or very heavy.
Make sure each hinge is fastened to something solid in the leaf, such as a rail or a stile, and not to a thin bar. On the post side, the hinge needs a through bolt, a weld or an embedded plate. Lag screws in a wood post work loose over time on a heavy gate.
Materials and finish
Forged steel hinges are strong and traditional, and they take paint well. Galvanized hinges resist rust and need less upkeep, and stainless hinges avoid rust stains altogether, though they cost more. Bronze and brass look handsome on a house of age but wear faster under heavy loads. Match the metal of the hinge to the gate where possible, since different metals set up rust where they touch in damp conditions.
Finish the hinge with the same system as the gate, and pay attention to the knuckle, where water can get in. A little grease in the knuckle and a sealed cap on top keep rain out of the working surfaces.
Installing and checking
Hang the gate with the hinges loosely fastened, check the swing and clearances, and then tighten and weld. Look for binding, scraping or any drift toward open or closed, since a leaf that moves by itself is out of plumb. Open the gate fully, close it and check that it settles at the latch with an even gap.
After a season, inspect the hinges again. Look for wear in the knuckles, loosening bolts and rust at the welds. A heavy gate on well chosen hinges, checked once a year, will carry on without drama for a very long time.
Questions to ask a fabricator
Ask what weight the hinges are rated for, how they attach to the post and the leaf, and whether they can be adjusted after installation. Ask whether the bearings are sealed or greasable and what the maker recommends for yearly care. A shop that answers plainly and quotes ratings is usually careful about the rest of the build too. Be wary of any answer that talks only about looks. Hinges are the part of a heavy gate that works hardest, and a few minutes of questions at the start pays back for decades.