Have you ever slid a bathroom bolt shut and felt the whole door give a little anyway? That small give is usually not the bolt failing. It is the bolt fixed in the wrong spot, on the wrong part of the door, or with screws that have nothing solid to bite into.
A tower bolt for door use is about the simplest piece of hardware in the house, which is exactly why it gets fitted carelessly. Where it goes changes a lot depending on whether the door is solid wood, PVC or a hollow-core flush door. Here is how to place it properly on each.
Fixing a tower bolt for door use on solid wood
Solid timber doors are the easiest case. The wood holds screws well almost anywhere, so you can focus on position. Fit the bolt on the inside face of the door, close to the edge that opens, so the bolt slides straight into a keeper on the frame. The further the bolt sits from the opening edge, the more leverage someone pushing the door has against it.
Height is the next choice. A single bolt is usually fitted around chest height, where it is easy to reach without bending. On a heavy main door or a back door that opens onto a lane, add a second one, which brings us to top and bottom bolts below.
Before fixing, close the door and mark where the bolt meets the frame with a pencil. Fit the keeper first, then the bolt body, and test the slide before driving the last screw. A bolt that has to be pushed hard to enter its keeper will be left open by everyone in the house within a week.
Tower bolt for PVC door and bathroom use
PVC doors are common in bathrooms and balconies because they shrug off water. Their weak point is fixing. Many PVC doors are hollow inside, or have a thin skin over a foam or honeycomb core, and long screws simply spin in the void.
For a tower bolt for PVC door fitting, look for the reinforced zones. Most PVC doors have a solid or stiffened band near the lock area and along the edges. Fix the bolt within that band. If you are unsure, tap the door lightly with a knuckle and listen, because a dull sound means solid material and a hollow ring means empty space. Use screws of the right length so they grip the solid section without pushing through the other face.
Since bathroom doors stay damp, an aluminium or stainless steel bolt is a sensible choice here. Mild steel bolts in a wet bathroom tend to show rust spots within a season.
Tower bolt for flush door installations
Flush doors, the flat-faced plywood or hardboard doors found in most flats, look solid but are often a frame of timber around a lighter core. The edges and a block near the lock position are usually solid. The middle of each face often is not.
So the rule for a tower bolt for flush door installation is simple. Keep the bolt near the edge where the internal timber frame sits, and avoid the centre of the panel. If you must fix somewhere without a solid backing, a carpenter can open a small section and insert a wooden block before fixing. It is a short job and makes the difference between a bolt that holds and one that pulls free when a child swings on the door.
Choosing length by door height
Tower bolts are made in many lengths, and the right one for a given door depends mostly on how tall and heavy the door is and where on the door the bolt will sit. As a working guide, short bolts suit cupboards, small bathroom doors and windows. Mid-length bolts suit standard bedroom and bathroom doors fitted at hand height. The longest bolts are for tall main doors, double doors and positions at the very top or bottom, where you need extra reach to get the bolt into the frame or floor.
A longer body also spreads the screws further apart, which spreads the load. On a heavy door, that is worth more than any extra thickness in the bolt itself.
Top and bottom tower bolt fitting
On tall doors, on double doors and on any door that leads outside, one bolt at hand height is rarely enough. A top and bottom tower bolt pair holds the door at both ends, so it cannot be flexed open at a corner.
The bottom bolt usually drops into a hole or socket in the floor or the threshold. Keep that socket clean, since dust and floor polish fill it surprisingly fast and stop the bolt seating fully. The top bolt slides upward into the frame head. On very tall doors, people often skip the top bolt because it is hard to reach, but a long bolt with its handle placed lower solves that.
My own preference on a back door is all three, a top bolt, a bottom bolt and one at hand height for daily use. It costs little and makes the door feel properly shut.
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Order or ask Atom Locks
Atom Locks, based in Aligarh, has been making locks, aldrops and tower bolts, including aluminium tower bolts in several finishes, since 2002. Have a look at the products on www.atomlocks.com or buy online at shop.atomlocks.com. If you are fitting out a whole building, the Bulk Query form on the site will get your order to the right people. For help picking a tower bolt for door use in your home, call +91 9412273735 or email sa***@*******ks.com.
