Mechanical Keyless Gate Lock Fit Checklist: Gate Thickness, Handing, Clearance, and Alignment
Four measurements decide whether a mechanical keyless lock will fit your gate. Frame thickness at the mounting point. Gate handing, meaning which way it opens and from which side you'll enter the code. Clearance between the gate edge and the latch post. And alignment between where the lock will sit and where the strike will meet it. Measure all four before ordering, write them down, and check them against the lock's published spec. That sequence prevents nearly every fit-related return. The rest of this article is the how for each measurement.
At a glance
Parameter | How to measure | Spec format you'll see | Fail response |
|---|---|---|---|
Gate thickness | Calipers or tape at the lock's mounting height | A range in inches, such as 1-1/4 in to 1-7/8 in | Reinforce, reframe, or pick a lock with a matching range |
Handing | Stand on the keypad side, note hinge edge and swing direction | Left, right, or universal | Buy a universal lock or the correct handed version |
Clearance | Gap between gate edge and latch post at top, middle, bottom | A gap range in the lock's installation manual | Adjust hinges or shim the latch post |
Alignment | Closed-gate check for a consistent gap and level latch marks | Pass or fail, no spec sheet needed | Fix the sag first, then remeasure everything |
How do you measure gate thickness for a keyless lock?
Measure at the exact height where the lock will mount. Not at a rail, not at a cap, and not at the bottom of the stile where some frames widen. The lock body passes hardware through the gate at that one spot, so that one spot is the number that matters.
Use calipers if you have them, a tape measure if you don't. On a clad or tapered frame, measure the full assembled thickness the lock will actually clamp through, including any facing material.
Then read the spec. Every serious mechanical lock publishes a frame thickness range, and your measurement either lands inside it or it doesn't. The myLock-Combination product page lists a range of 1-1/4 inches to 1-7/8 inches, which is the format to expect from any manufacturer. One caution that catches people constantly. Measure the frame, not the infill. Panel or board thickness tells you nothing about whether the lock fits, because the lock mounts to the stile, and on most gates the two numbers are different.
How do you determine gate handing?
Stand on the side of the gate where you'll enter the code. Look at which edge the hinges are on and whether the gate swings toward you or away from you. Left hinges swinging away is one handing, right hinges swinging toward you is another, and lock manufacturers name these combinations differently, so match your observation to the specific product's handing diagram rather than to a generic rule.
Handing matters mechanically because it sets which way the latch throws and which face the keypad presents. A handed lock installed on the wrong gate either won't latch or puts the keypad on the private side.
Here's the exception that simplifies everything. A Universal Fit lock installs on left-opening and right-opening gates without extra parts or a separate version, which turns handing from a pass-or-fail parameter into a record-only field. Modern Yard's myLock-Combination is built this way, and most mechanical gate locks on the market are not, so if a universal design is available for your gate, it removes the single most error-prone step in the order. If your chosen lock is handed, write the handing down, check it against the diagram twice, and only then order.
How much clearance does the lock need between gate and post?
Clearance is the gap between the gate's latch-side edge and the face of the latch post. Too tight and the latch binds or scrapes every time the gate closes. Too wide and the latch can't reach the strike at all.
Measure the gap at three heights, top, middle, and bottom of the gate edge, and record all three numbers. A gate with a consistent gap is ready for a lock. A gate that reads half an inch at the top and an inch at the bottom is telling you about a hinge or sag problem, which the alignment check below will confirm.
What counts as an acceptable gap is defined by each lock's installation documentation, not by an industry-wide number, so check the manual for the product you're buying and measure against it. Material behavior belongs in this check too. Wood gates swell in wet months and shrink in dry ones, so a gap measured in August won't be the gap in February, and you should leave room on the generous side of the manual's figure. A welded aluminum frame holds its dimensions through the seasons, which is one reason gaps on metal system gates stay where you set them.
Quick check. Close the gate and slide a scrap of the manual's minimum gap thickness into the space at all three heights. If it binds anywhere or rattles everywhere, you've found your adjustment work before the lock arrives.
How do you check alignment before drilling anything?
Alignment is the pass-or-fail test that overrides the other three. Close the gate and look for three things. The gap between gate edge and post stays consistent from top to bottom. A pencil mark at latch height on the gate meets a mark at the same height on the post. And the gate face sits flush in the plane of the fence rather than twisting out of it.
A gate that passes thickness, handing, and clearance but fails alignment still can't take a lock, because the latch and strike will meet today and miss next month. Sag gets fixed first, by adjusting hinges, squaring the frame, or bracing, and then all four measurements get taken again from scratch.
Factory pre-drilling changes what this check is for. Modern Yard's welded aluminum gate frames, such as the 42 inch by 42 inch door frame, arrive with the lock position drilled at a fixed factory location, so lock alignment stops being a drilling problem and becomes a gate-hanging problem. Hang the frame plumb and the holes are already where they need to be. On any gate you drill yourself, the alignment check is also your drilling template, so take it seriously.
What should your completed fit record look like?
Five lines, written down before you order anything.
Thickness. The measured frame thickness at lock height, in inches.
Handing. Left, right, or universal-eligible, observed from the keypad side.
Clearance. The gap at top, middle, and bottom, three numbers.
Alignment. Pass or fail, with a note on what needs fixing if it's a fail.
Frame material. Wood, vinyl, steel, or aluminum, because material predicts seasonal movement and reinforcement needs.
This record is exactly what a dealer or installer needs to confirm compatibility, and it turns a vague "will this fit my gate" conversation into a two-minute check against a spec sheet. If you're working within a matched system, the same record checks instantly against the published dimensions on the manufacturer's technical drawings page.
What do you do when one parameter fails?
Each failure has a specific response, and none of them is forcing the install.
Thickness fail. Reinforce a hollow or thin frame, reframe the gate, or select a lock whose published range matches your measurement.
Handing fail. Choose a Universal Fit lock, or exchange for the correctly handed version before anything gets mounted.
Clearance fail. Adjust the hinges to move the gate within the manual's gap range, or shim and reface the latch post.
Alignment fail. Stop. Fix the sag or racking, then remeasure all four parameters, because correcting alignment changes the other three numbers.
The pattern across all four is the same. The gate gets corrected to meet the lock's documented requirements, and the lock never gets modified to tolerate the gate. Step-by-step gate frame manuals and videos on the installation guides page show what a correctly hung frame looks like if you want a reference standard.
Measure four times, order once
Take the four measurements in order, record the five-line fit sheet, and check it against the published spec of the exact lock you plan to buy. Thickness and clearance are numbers, handing is an observation, and alignment is a judgment that overrides the rest. A gate that passes all four takes a mechanical keyless lock cleanly, and the fit sheet you wrote will still be useful the day a part needs replacing.
FAQ
What gate thickness do keyless locks fit?
Each lock publishes its own range, and there's no universal number. As a reference point, the myLock-Combination fits gate frames from 1-1/4 inches to 1-7/8 inches thick. Measure your frame at the lock's mounting height and compare against the specific product's spec.
How do I know if my gate is left-handed or right-handed?
Stand on the side where you'll enter the code, then note which edge holds the hinges and whether the gate swings toward or away from you. Match that observation to the handing diagram of the lock you're considering, since naming conventions vary between manufacturers.
How big should the gap between gate and post be for a lock?
Use the figure in your lock's installation manual, because acceptable gaps differ between products. Measure at top, middle, and bottom of the gate edge. If the three numbers don't match each other, address the sag before worrying about the gap size.
Can I install a keyless gate lock on a wooden gate that swells in winter?
Yes, if you plan for the movement. Measure clearance in the wet season or leave margin toward the generous end of the manual's gap range, and expect to check the fit as seasons change. A dimensionally stable frame material avoids the issue entirely.
Do I need to drill holes for a mechanical gate lock?
On most gates, yes, using the template in the lock's manual after you've passed the alignment check. On gates designed for a specific lock, like Modern Yard's welded aluminum frames with factory pre-drilled lock positions, no on-site drilling is required.
Can one lock fit both an inswing and an outswing gate?
Only if it's a universal design. A Universal Fit lock such as the myLock-Combination installs on either swing direction without extra parts. Handed locks must match your gate's specific configuration, so verify before ordering.