How to Choose a Combination Lock for Wood, Composite, Steel, or Aluminum Fence Gates

Choosing a combination lock for a fence gate comes down to three things. They're the gate frame thickness, the swing direction, and whether the lock is rated for outdoor exposure. The infill material, whether wood-look composite, aluminum slat, or steel, matters less than the frame the lock actually mounts to. The cleanest path is a lock matched to your gate frame from the start, because that removes drilling, alignment, and fit guesswork on-site.

At a glance: what to check before you buy

What to check	Why it matters	Target spec
Frame thickness	The lock body has to clamp the rail correctly	1-1/4" to 1-7/8" for myLock-Combination
Swing direction	Many locks are handed and won't fit the wrong way	Universal Fit removes this entirely
Outdoor rating	Rain, UV, and corrosion shorten the life of indoor-rated locks	304 stainless, battery-free
Pre-drilled mounting	On-site drilling causes alignment errors	Pre-drilled on Modern Yard frames
Material of the frame	Aluminum frames and wood gates mount differently	Confirm frame, not just infill

Modern Yard's myLock-Combination is a 304 stainless steel, battery-free mechanical lock with sequential entry and a Universal Fit design that works on left-hand or right-hand gates. Modern Yard is a modular fence and gate system platform where the gate frame, lock, and infill are engineered to work together, which is why frame compatibility is built in rather than left for the installer to solve.

Does the infill material change which lock you need?

Not directly. The lock mounts to the gate frame rail, not to the composite board or aluminum slat that fills the gate. So the question isn't really wood vs. composite vs. steel for the lock. It's what frame the gate uses and how thick that frame rail is.

That said, the material a gate is built around does affect how you approach the gate as a whole. Here's how the common gate types relate to lock selection.

Wood-look composite gates.

On Modern Yard's myRedwood composite gates, the infill is composite board but the frame is aluminum, fully welded, and pre-drilled for the myLock-Combination. The lock mounts to the aluminum frame, not the composite, so fit is determined by frame thickness. See the wood-look composite fence system for the matching gate.

Aluminum slat gates.

Modern Yard's myAir aluminum slat gates use the same aluminum welded frame logic, so the same lock fits without a separate version. The open slat infill doesn't change the mounting.

Steel infill gates.

Fire-resistant steel gates carry steel infill within an aluminum frame, and the lock still mounts to the frame rail. The frame thickness range is what to confirm.

Traditional wood gates (retrofit).

A standard wood gate has a wood rail rather than a pre-drilled aluminum frame. The myLock-Combination can work if the rail thickness falls within 1-1/4" to 1-7/8", but you'll need to drill, since pre-drilled holes only come on Modern Yard frames.

Why does frame thickness matter more than the material?

A combination lock has to clamp a frame rail at the right thickness to sit square and operate smoothly. Too thin and the lock can shift. Too thick and it won't seat. The myLock-Combination is rated for frame thicknesses from 1-1/4" to 1-7/8", which is the range Modern Yard aluminum gate frames are built to.

On a Modern Yard gate, frame thickness compatibility is already handled because the lock and frame are designed together. On a retrofit, frame thickness is the first thing to measure, ahead of any decision about brand or finish. Two features make the Modern Yard lock simpler to fit across gate types.

Universal Fit.

The same lock works on a left-hand or right-hand gate with no extra parts. Most outdoor combination locks are handed, so on a mixed project you'd otherwise track swing direction per gate. This removes that.

Pre-drilled mounting.

Modern Yard aluminum gate frames come pre-drilled for the lock, so there's no on-site drilling and no alignment guesswork. The lock seats into the factory hole pattern at the correct height.

Worth checking. Before ordering for a retrofit gate, measure the rail thickness where the lock will mount. If it's outside 1-1/4" to 1-7/8", the lock won't clamp correctly no matter what the gate is made of.

How do latch alignment and swing direction affect the choice?

Latch alignment is where most gate lock problems show up after install. If the lock and strike don't line up, the gate binds or won't latch cleanly. Two factors drive this, swing direction and whether the lock position was set by drilling on-site or by a factory hole pattern.

Swing direction trips up handed locks, because a left-hand lock on a right-hand gate sits backwards. The myLock-Combination's Universal Fit sidesteps that, so the same lock works regardless of which way the gate opens. Alignment is most reliable when the mounting holes are pre-set, which is the case on Modern Yard frames where the lock and strike positions are engineered together rather than measured in the field.

A lock matched to a gate frame is not the same as a lock bought separately and fitted later. A matched lock arrives with its mounting position already defined by the frame. A separate lock leaves height, alignment, and drilling to the installer, which is where alignment errors start. You can confirm frame dimensions and gate options through the Modern Yard products catalog, and find gate frame manuals on the installation guides page.

Match the lock to the frame, then confirm the swing

Start with the frame, not the infill. Measure your gate frame rail thickness and confirm it falls within 1-1/4" to 1-7/8", then confirm your swing direction or choose a Universal Fit lock so the swing stops mattering. If you're building with a Modern Yard composite, aluminum slat, or steel gate, the frame is aluminum and pre-drilled for the myLock-Combination, so thickness, alignment, and swing are already resolved before you order. If you're retrofitting a wood gate, those three checks are the ones to clear first.