Retrofitting Full-Extension Drawer Runners for Mepla Kitchens
Unlike a single-extension runner, a full-extension drawer runner pulls out 100% from the cabinet carcass, offering complete access to the entire contents of the drawer.
When older kitchen cabinets are being modernised, replacing the drawer runners is often at the top of the list. Hardware fittings are subject to mechanical wear, especially in heavily used areas. Anyone looking for a replacement for Mepla or wishing to upgrade an existing Mepla kitchen with modern drawer runners does not necessarily have to track down remaining old stock from the original manufacturer. With precise measurements and the matching hole pattern, modern runner systems can be integrated seamlessly as a compatible alternative to Mepla.
This guide explains the technical requirements, correct measurements, and installation steps required to professionally convert drawers to full-extension runners.
What to Consider for Compatibility
To ensure a new runner fits into an existing cabinet carcass as a replacement for Mepla, three core technical parameters must strictly match: installation width, nominal length, and the hole pattern.
Installation Width (Side Clearance)
The installation width defines the distance between the outer drawer box wall and the inner cabinet carcass wall. For a classic ball-bearing runner mounted to the side, this measurement is typically exactly 12.7 mm per side. If the gap is narrower or wider, the full-extension runner will jam or the ball bearings will not engage correctly with the profile. For an undermount runner, which is concealed beneath the drawer base, different tolerances apply, as the internal carcass width and the timber thickness of the drawer side (often 16 mm) are critical.
Nominal Length
Runner rails are manufactured in standardised lengths, typically ranging from 250 mm to 800 mm. The nominal length always refers to the closed state of the runner. If the old rail is 500 mm long, the new full-extension runner must also measure 500 mm. The available space inside the cabinet carcass (internal depth) must be at least equal to the nominal length plus approximately 3 mm to 5 mm tolerance.
System 32 and Hole Pattern
System 32 is the millimetre-precise backbone of modern furniture construction. This standardised grid defines the spacing between drill holes (exactly 32 mm) as well as the distance from the front-most hole to the front edge of the carcass (usually 37 mm). If the old cabinet was built according to this system, modern runners can be screwed directly into the existing row of holes. The drill hole diameter in the carcass side panel is usually 5 mm for this purpose, suitable for Euro screws.
Suitable Components for the Conversion
When selecting new hardware, the desired functionality is just as important as the dimensions. Mechanisms such as soft-close (an integrated damper that gently pulls the drawer shut over the final few centimetres) and push-to-open (a spring-loaded mechanism for handleless fronts) serve opposing purposes and are chosen according to specific requirements.
Those upgrading their cabinets can find matching kitchen cabinet pull-outs suitable as an alternative to Mepla. The choice depends on the width of the cabinet. For standard dimensions, a kitchen cabinet pull-out 60 cm is an ideal option.
When a drawer is already removed, it is often worthwhile looking at the interior organisation and wider kitchen fittings. A structured kitchen drawer organiser ensures order within the newly gained storage space of the full extension. In the lower section of the kitchen, particularly under the sink, a pull-out kitchen bin is a sensible addition that also operates on ball-bearing runners. To give the modernised kitchen a refreshed look at the same time, new kitchen furniture handles can be installed during the upgrade.
Installation and Retrofitting: Step-by-Step
Replacing a runner rail requires precision, but it can be easily accomplished using standard tools.
Tools Required
- Cordless screwdriver with suitable driver bits (usually PZ or TX)
- Tape measure or rule
- Spirit level
- Bradawl (if new pilot holes must be marked in the wood)
- Chipboard screws (e.g. 3.5 x 16 mm or 4 x 16 mm) or Euro screws
Step 1: Removal
Pull the drawer out completely and detach it from the runner by lifting slightly (for roller runners) or by releasing the lever catches (for ball-bearing runners). Then, unscrew the old carcass and drawer profiles.
Step 2: Checking Measurements
Measure the old rail. Does the drill hole pattern in the carcass line up with the new runner? If not, the height of the original fixing holes must be transferred precisely to the new profile. A spirit level helps to mark the new horizontal reference line inside the cabinet.
Step 3: Fitting the Carcass Rail
Position the carcass rail against the side panel. The front screw is placed 37 mm from the front edge. Initially tighten only two screws loosely to allow for adjustment. Once everything is perfectly level, tighten the remaining screws securely.
Step 4: Fitting the Drawer Profile
The matching drawer profile is fitted to the side or underneath the base of the drawer box. The rail must sit flush with the front panel.
Step 5: Insertion and Adjustment
Guide the drawer horizontally into the cabinet until the carcass runners engage with the drawer profiles. Push inwards with gentle pressure until the mechanism audibly clicks into place. Test the movement several times. A full-extension runner should operate smoothly without noticeable resistance.
Further Replacements: Concealed Cupboard Hinges
In older kitchens, replacements are frequently needed not just for runners, but also for hinges. Anyone needing to replace an old concealed hinge (e.g. models with a 110° opening angle) must measure the hinge cup diameter in the door. The standard here is exactly 35 mm. The mounting type must also be noted: a full overlay is used when the door covers the carcass side panel entirely, whereas a half overlay is used for adjacent doors sharing a central dividing partition. Here too, modern hinges with cruciform mounting plates provide exact compatibility.
Frequently Asked Questions (FAQ)
Can I simply replace a single-extension runner with a full-extension runner? Yes, this is generally straightforward provided the installation width (e.g. 12.7 mm) and nominal length are identical. The carcass simply needs to have sufficient internal depth for the selected nominal length.
How do I calculate the load capacity for my new runners? The required load rating in kilograms (kg) is calculated from the self-weight of the drawer plus the maximum weight of its contents. For ordinary cutlery drawers, runners with a 30 kg load capacity are sufficient; for heavy pots and pans or crockery, heavy-duty runners rated at 45 kg or more should be chosen.
Are furnica runners compatible with Mepla systems? Our runners serve as fully functional alternatives to Mepla. The deciding factor for a correct fit is not the brand name, but the match in technical hole spacing (often System 32), nominal length, and lateral installation width.
Why does my drawer not sit flush after installation? This usually happens if the carcass rail was not installed at a precise 90-degree angle or if the 37 mm setback from the front edge was not maintained. On runners with soft-close, ensure the activator pin engages correctly with the damper mechanism on both sides.