A gate is not a big door, and an aldrop lock for gate use should not be picked as if it were. A wooden door sits in a fixed frame, out of the rain, and closes the same way every day. A gate swings on outdoor hinges, sags a little each monsoon, gets pushed by cows, scooters and children, and is locked from outside as often as from inside. The aldrop that suits your bedroom or main door will feel flimsy within a season on the front gate.
This guide covers the gate side of things only, because that is where most buyers go wrong. If you are fitting a wooden main door, the choices are different.
Why an aldrop lock for gate use works harder
An aldrop is a sliding bar that runs through guides on one side and drops into a receiving hook or staple on the other, with a hole at the end for a padlock. On a door, the gap it bridges is tiny and steady. On a gate, the two leaves rarely sit perfectly level. One may hang slightly lower, the leaves may not meet flush, and there is often a gap of a few centimetres between them.
So a gate aldrop needs a longer bar to bridge that gap with plenty of overlap, a thicker section so it does not bend when someone leans on the gate, and guides that hold it tight without wobble. It also has to be easy to slide when the gate is slightly out of line, because nobody wants to lift a heavy leaf every evening just to lock up.
Getting the gate aldrop size right
Measure before you buy. Close the gate as it normally rests and measure from the point where the aldrop body will sit on one leaf, across the gap, to where the receiving staple will go on the other. The bar should travel well past the staple when shut, not just reach it. If it only just catches, a little sag will pull it free.
As a rule of thumb, longer and heavier aldrops suit main gates and wide double gates, while medium lengths suit single pedestrian gates and side entries. For wicket gates set into a bigger main gate, a shorter aldrop is often enough. If your two leaves meet at different heights, ask for a design with a tall receiving staple, which gives the bar a bigger target.
Mounting an aldrop for iron gate frames
Most Indian gates are iron or mild steel, and the mounting method matters as much as the aldrop.
- Bolting through. The aldrop is fixed with nuts and bolts through drilled holes in a flat bar or plate on the gate. This is neat, can be removed later, and lets you change the aldrop without cutting. Use bolts with the nut on the inside so they cannot be undone from the road.
- Welding. Many fabricators weld the aldrop or its base straight to the gate frame. It is very strong, but the heat burns away the finish around the weld, and the spot will rust unless it is primed and painted. You also cannot swap it easily.
- Welded plate, bolted aldrop. Our preferred middle path. The fabricator welds a flat plate to the gate, and the aldrop is bolted onto that plate. You get welding strength with the freedom to replace the aldrop later.
On hollow square pipe gates, never drill straight through thin pipe and expect it to hold. Weld a plate or a solid flat first. Thin pipe walls crush under a bolt and the aldrop loosens.
Picking the padlock for gate use
The aldrop and padlock should be chosen as a pair. Check the diameter of the padlock hole on the aldrop and pick a padlock for gate use whose shackle fills it closely. A thin shackle in a large hole rattles and is easier to lever. A thick shackle that does not fit is useless.
Shackle length matters too. A short shackle sits close to the aldrop and is harder to attack with a bar, which is good. But it must be long enough to close around the aldrop end without forcing. Outdoors, choose a padlock with a body and shackle that suit the weather, and put a drop of oil in the keyhole before every monsoon. A padlock that seizes in August is a common reason people end up cutting their own gate lock.
Weather care for gate hardware
Even good hardware needs some care when it lives outdoors. Wipe dust off the bar and guides every few weeks, put a little grease on the sliding part, and touch up paint around any weld spots. In coastal towns, salt air works on every exposed surface, so check the finish more often. If the gate starts to sag so the aldrop binds, fix the hinges rather than forcing the bar. Forcing it bends the guides and soon the aldrop stops sliding at all.
Also read
Order or ask Atom Locks
Atom Locks has made aldrops, padlocks, tower bolts and door hardware in Aligarh since 2002, and supplies homeowners, office owners and builders alike. You can see the aldrop and padlock range on www.atomlocks.com and order from shop.atomlocks.com, while gate fabricators and builders needing quantity can send a Bulk Query. For help matching an aldrop and padlock to your gate, call +91 9412273735 or email sa***@*******ks.com.
