What Full Replacement Handle Lock Set Fits a Sliding Door With 3-15/16-Inch Screw Holes?
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<p>If the two main mounting screws on your sliding-door handle are <strong>3-15/16 inches apart, measured center to center</strong>, and the door is <strong>1-1/2 to 1-3/4 inches thick</strong>, the EASILOK A10 keyed full replacement set can enter your comparison list. The set combines an interior handle and thumb latch, an exterior pull with a key cylinder, a mortise lock, and related mounting hardware in one coordinated replacement path.</p>
<p>Those two measurements are important, but they do not prove fit by themselves. Before ordering, also compare the mortise-lock position, operating connection, hook and keeper, available mounting surface, and normal door movement. The reversible, non-handed design allows the handle system to be configured for left- or right-closing sliding doors, but it does not make unrelated door preparations compatible.</p>
<p>This guide shows exactly what to measure and photograph before choosing a full sliding-door handle lock set.</p>
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<!-- BRIEF: A verified EASILOK A10 keyed sliding-door set on a clean background with labels for interior handle, thumb latch, exterior keyed pull, mortise hook lock, and mounting hardware. Add two specification badges: 3-15/16″ screw-hole spacing and 1-1/2″–1-3/4″ door thickness. -->
<!-- ALT: Full keyed sliding door handle lock set with mortise lock and required dimensions -->
<h2>Quick Fit Answer</h2>
<table>
<thead>
<tr>
<th>Fit item</th>
<th>Required value or condition</th>
<th>How to check</th>
</tr>
</thead>
<tbody><tr>
<td>Main screw-hole spacing</td>
<td>3-15/16″, approximately 100 mm</td>
<td>Measure from the center of one main mounting hole to the center of the other</td>
</tr>
<tr>
<td>Door thickness</td>
<td>1-1/2″ to 1-3/4″</td>
<td>Measure the actual door stile at the handle installation area</td>
</tr>
<tr>
<td>Lock type</td>
<td>Compatible recessed mortise lock</td>
<td>Photograph the door edge, faceplate, operating hub, and hook</td>
</tr>
<tr>
<td>Exterior operation</td>
<td>Physical key cylinder required</td>
<td>Confirm that you need keyed operation from outside</td>
</tr>
<tr>
<td>Door direction</td>
<td>Left- or right-closing sliding door</td>
<td>Use the reversible, non-handed configuration according to current instructions</td>
</tr>
<tr>
<td>Receiving hardware</td>
<td>Compatible keeper, correctly aligned</td>
<td>Test the hook with the door open and compare its position when closed</td>
</tr>
</tbody></table>
<p>Do not order if only the color and overall handle shape look similar. The full mechanical relationship must match.</p>
<h2>Step 1: Measure the 3-15/16-Inch Screw-Hole Spacing Correctly</h2>
<p>The <strong>3-15/16-inch dimension is center-to-center spacing</strong>, not the total length of the handle and not the distance between the closest edges of the holes.</p>
<p>To record it:</p>
<ol>
<li>Open the door and keep the panel stable.</li>
<li>Identify the two main through-bolt or mounting-screw centers.</li>
<li>Place a ruler parallel to the line between the holes.</li>
<li>Measure from the center of the first hole to the center of the second.</li>
<li>Photograph the ruler in place without hiding either center.</li>
</ol>
<p>The target is <strong>3-15/16 inches</strong>, which is approximately <strong>100 mm</strong>. A difference that looks small can prevent the screws, handle, and operating connection from aligning correctly. Do not enlarge holes or drill new holes merely to make a mismatched set fit.</p>
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<!-- BRIEF: Close technical view of a sliding-door stile showing exactly how to measure 3-15/16″ center to center between the two main handle screw holes. Include a correct center-to-center example and an incorrect edge-to-edge example. -->
<!-- ALT: How to measure 3-15/16-inch sliding door handle screw-hole spacing center to center -->
<h2>Step 2: Measure Door Thickness at the Handle Area</h2>
<p>The target door thickness for this article is <strong>1-1/2 inches to 1-3/4 inches</strong>. Measure the actual stile where the handle passes through the door.</p>
<p>Avoid these common errors:</p>
<ul>
<li>measuring decorative trim instead of the structural door stile;</li>
<li>including weatherstripping that compresses;</li>
<li>estimating from an online specification for a similar door;</li>
<li>measuring another panel in the same home; or</li>
<li>assuming that 1-1/2″ and 1-3/4″ use the same screw setup without checking the selected instructions.</li>
</ul>
<p>Record the result in both inches and millimeters if possible. Use the mounting hardware and instructions supplied for the selected A10 version rather than mixing screws from an unrelated set.</p>
<h2>Step 3: Confirm the Existing Mortise-Lock Layout</h2>
<p>The mortise lock is recessed into the edge of the sliding door. A complete replacement set still needs the new mortise body and operating hub to align with the existing door preparation.</p>
<p>Check:</p>
<ul>
<li>faceplate height and width;</li>
<li>body depth and available cavity;</li>
<li>screw locations on the mortise faceplate;</li>
<li>location and shape of the operating hub;</li>
<li>direction and normal travel of the hook;</li>
<li>relationship between the handle thumb latch and the mortise hub; and</li>
<li>location and shape of the keeper on the frame.</li>
</ul>
<p>If the old handle has 3-15/16″ screw spacing but the mortise body or hub sits in a different position, the handle set may still be incompatible.</p>
<h2>Step 4: Confirm That You Need a Key Cylinder</h2>
<p>This article describes the <strong>Keyed</strong> full replacement path: the exterior pull includes a physical key cylinder for authorized operation from outside.</p>
<p>Choose this path when:</p>
<ul>
<li>the sliding door is regularly used as an entrance from the yard or patio;</li>
<li>you need to lock or unlock it with a physical key from outside; and</li>
<li>the keyed operating connection is compatible with the mortise lock.</li>
</ul>
<p>If the outside only needs a pull and all locking is controlled by the interior thumb latch, compare the A10 Non-Keyed version instead. Non-Keyed is not a keypad, electronic lock, or smart lock.</p>
<h2>Step 5: Understand Reversible, Non-Handed Design</h2>
<p>A reversible or non-handed design means the handle system can be configured for a sliding door that closes toward either side, following the current A10 instructions. You do not need to select a permanent left-hand or right-hand handle body before measuring.</p>
<p>It does <strong>not</strong> mean:</p>
<ul>
<li>the screw-hole spacing can be different;</li>
<li>any door thickness will fit;</li>
<li>the mortise lock can sit anywhere;</li>
<li>the hook and keeper can be mismatched; or</li>
<li>the door can be installed upside down or without following the instructions.</li>
</ul>
<p>Confirm the sliding direction, the operating connection, and the hook orientation during installation planning.</p>
<h2>Step 6: Test the Door and Keeper Before Replacing Hardware</h2>
<p>With the door open, gently operate the existing thumb latch and watch the hook. Then close the panel normally and compare the result.</p>
<ul>
<li>If the hook works while open but misses the keeper when closed, inspect rollers, track, door height, frame, and keeper alignment.</li>
<li>If the thumb latch moves but the hook does not, inspect the operating connection and mortise lock.</li>
<li>If the door drags or must be lifted to lock, correct the door condition first.</li>
<li>If glass, frame, or mounting points are loose or damaged, stop and arrange appropriate repair.</li>
</ul>
<p>A new full set cannot compensate for a door that does not reach the keeper correctly.</p>
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<!-- BRIEF: A six-point fit checklist combining 3-15/16″ hole spacing, 1-1/2″–1-3/4″ door thickness, mortise location, keyed exterior pull, reversible direction, and hook-to-keeper alignment. -->
<!-- ALT: Sliding door full replacement handle lock set fit checklist -->
<h2>Full Pre-Purchase Checklist</h2>
<ul>
<li>The active panel slides horizontally rather than swinging on hinges.</li>
<li>Main mounting holes measure 3-15/16″ center to center.</li>
<li>Door thickness measures between 1-1/2″ and 1-3/4″ at the handle area.</li>
<li>The mortise faceplate, body, hub, hook, and cavity match the selected set.</li>
<li>The keeper is compatible and correctly aligned.</li>
<li>A physical exterior key cylinder is actually required.</li>
<li>The current instructions support the needed left- or right-closing configuration.</li>
<li>The door, glass, frame, rollers, and track are structurally sound.</li>
<li>Product photos and packaging confirm all required components are included.</li>
</ul>
<h2>Common Buying Mistakes</h2>
<ul>
<li>Measuring screw-hole edges instead of centers.</li>
<li>Confusing handle length with 3-15/16″ hole spacing.</li>
<li>Measuring weatherstripping as part of door thickness.</li>
<li>Assuming every 100 mm handle uses the same mortise lock.</li>
<li>Ignoring the keeper and door alignment.</li>
<li>Ordering Keyed when no outside key operation is needed.</li>
<li>Treating reversible design as universal fit.</li>
<li>Drilling new holes before confirming the entire lock system.</li>
</ul>
<h2>Frequently Asked Questions</h2>
<h3>Is 3-15/16-inch screw-hole spacing the same as 100 mm?</h3>
<p>It is approximately 100 mm. For a replacement decision, measure the actual holes from center to center with a physical ruler and compare the result with the current A10 drawing. Do not use the overall handle length or edge-to-edge spacing.</p>
<h3>Will this full replacement set fit every 1-1/2- to 1-3/4-inch-thick sliding door?</h3>
<p>No. Door thickness is only one fit condition. The 3-15/16″ mounting-hole spacing, mortise body, faceplate, operating hub, hook, keeper, mounting surface, and door condition must also match.</p>
<h3>Does reversible non-handed design fit both left- and right-closing sliding doors?</h3>
<p>It is intended to support either closing direction when configured according to the current instructions. Reversibility does not change the required dimensions or make an unrelated mortise-lock layout compatible.</p>
<h2>Product References</h2>
<ul>
<li><a href="https://www.easilok.com/products/easilok-a10-sliding-door-lock-solve-the-installation-of-the-thumb-turn-white-keyed">EASILOK A10 Keyed Sliding Door Handle Lock Set</a></li>
<li><a href="https://www.easilok.com/products/easilok-a10-sliding-door-lock-solve-the-installation-of-the-thumb-turn-white-non-keyed">EASILOK A10 Non-Keyed Sliding Door Handle Lock Set</a></li>
<li><a href="https://www.easilok.com/blogs/guides">More EASILOK door-identification and replacement guides</a></li>
</ul>
<h2>Final Answer</h2>
<p>A sliding door with <strong>3-15/16″ center-to-center handle holes</strong> and a <strong>1-1/2″–1-3/4″ door thickness</strong> may be a candidate for the EASILOK A10 keyed full replacement set with key cylinder and mortise lock. Confirm the mortise body, operating hub, hook, keeper, mounting surface, outside-key requirement, and door condition before ordering. The reversible non-handed design supports left- or right-closing use, but it is not a universal-fit substitute for measurement.</p>
