Drawer Runner Systems for Alcove Cabinets: Roller Runners or Ball Bearing Full Extension?

June 18, 2026

A ball bearing full extension runner extends to 100% and provides maximum space utilisation in deep alcove cabinets, whereas a roller runner is designed as a partial extension, leaving around 25% of the drawer inside the carcass.

Alcove cabinets place special demands on construction. Whether used as an extremely narrow larder unit in the kitchen or as a shallow chest of drawers in a tight hallway: the available space must be utilised down to the millimetre. The choice of the right runner system determines whether the drawer runs smoothly over the long term, supports the weight of its contents, and ensures the rearmost corner of the cabinet remains accessible. This guide provides the technical basis for choosing between roller and ball bearing runners.

Key Buying Criteria for Alcove Drawer Runners

When planning narrow or shallow carcasses, there is no margin for calculation errors. The fittings must match the geometry of the cabinet perfectly.

Installation Width and Side Clearance

The space between the inside of the carcass and the outside of the drawer is the most critical dimension. Like an accurately fitted piston in a cylinder, a ball bearing runner requires a defined clearance to function smoothly. The standard dimension for side-mounted ball bearing runners is exactly 12.7 mm (often rounded to 13 mm) per side. A roller runner generally requires 12.5 mm per side. If the alcove cabinet is extremely narrow, the internal width of the carcass minus 25 mm to 26 mm must be calculated to determine the exact external width of the drawer.

Nominal Length and Carcass Depth

The length of the runner must be matched to the depth of the cabinet. For very shallow furniture in the entrance area, such as a shoe cabinet with a depth of 30 cm, short drawer runners 250 mm are suitable. If deep alcoves next to the fridge are utilised, long variants such as drawer runners 600 mm are used. The nominal length of the runner should always correspond to the external length of the drawer and be at most as long as the internal carcass depth minus a tolerance of 3 mm to 5 mm.

Load Capacity

The dynamic load capacity is specified in kilograms (kg) and always refers to the pair (two runners). Standard roller runners usually carry between 15 kg and 25 kg. This is sufficient for lightweight utensils, socks, or paperwork. Ball bearing runners often start at 30 kg to 45 kg. If heavy tinned food or tools are stored in a deep alcove cabinet, an upgrade to heavy duty drawer runners is required, which can accommodate load capacities of 80 kg, 130 kg, or more.

Drilling Pattern and System 32

Modern fittings are standardised to System 32. This means: the vertical distance between the fixing holes is a multiple of 32 mm, and the first row of holes sits exactly 37 mm from the front edge of the carcass. Ensure that the chosen runners support this grid to facilitate installation in pre-drilled carcasses.

Technical Overview of Types and Options

The mechanics of the runners determine the running action and accessibility. The two most common systems for side mounting differ fundamentally in their construction.

The Roller Runner (Partial Extension)

A drawer runner roller runner consists of two epoxy-coated steel profiles per side. One profile is screwed to the carcass, the other to the underside of the drawer base. Movement is achieved via plastic rollers (usually POM).

Extension travel: By design, this is a partial extension. The drawer stops before it is pulled completely out of the carcass.
Advantage: Very simple installation, high error tolerance (the system accommodates slight carcass dimensional deviations of 1 mm to 2 mm). The drawer can be removed completely by simply lifting it over the front roller.
Disadvantage: The rear part of the drawer remains concealed inside the carcass.

The Ball Bearing Runner (Full Extension)

A drawer runner full extension with ball bearings consists of three telescopic profiles running inside one another (outer, intermediate, and inner profile). Movement is achieved via ball cages with small steel balls.

Extension travel: 100%. The drawer can be pulled out of the cabinet across its entire length.
Advantage: Maximum visibility, high lateral stability, no jamming.
Disadvantage: Low tolerance regarding installation width. If the drawer is built even 2 mm too narrow or too wide, the ball cages jam, making the runner stiff or causing damage.

Kinematics: Soft-Close vs. Push-to-Open

Additional mechanisms increase user convenience, but their working principles are mutually exclusive. They must not be confused during planning:

Soft-Close (Damping): A hydraulic damper absorbs the momentum of the closing drawer. Over the last few centimetres, a spring mechanism engages, pulling the drawer gently and silently into the closed end position. Drawer runners with soft-close require a furniture handle for opening.
Push-to-Open (Tip-On): A mechanical spring is tensioned and locked upon closing. Pressing the closed front releases the catch, and the spring pushes the drawer open by a few centimetres. Push to open drawer runners are strictly necessary when handleless fronts are to be installed.

Which System for Which Situation? (Decision Guide)

The choice of hardware depends directly on the dimensions of the alcove cabinet and its intended use.

Scenario 1: Shallow hallway cabinet (depth under 35 cm) for lightweight items.

A roller runner is often sufficient here. Because the drawer is very short anyway, the loss due to the partial extension is barely noticeable. The contents remain easily accessible.

Scenario 2: Deep larder unit (depth 50 cm to 60 cm, width only 20 cm to 30 cm).

In deep and narrow carcasses, a full extension is strictly necessary. With a partial extension, the rear section in a tight alcove would be practically inaccessible. A ball bearing runner also ensures that the narrow, yet long drawer does not tilt sideways when pulled out.

Scenario 3: Handleless designer chest of drawers in an alcove.

If the alcove cabinet is to sit flush with the wall and no handles should protrude, ball bearing runners with a push-to-open mechanism are the mandatory choice.

Notes on Correct Installation

Fitting runner systems requires precision. A spirit level, tape measure, try square, and cordless screwdriver are essential basic tools.

Required Tools and Fixing Materials

For fixing into timber-based panels (such as chipboard or MDF), use dedicated countersunk chipboard screws. The diameter should be 3.5 mm or 4.0 mm, with the length matching the material thickness (usually 16 mm). Pay attention to using the correct driver bit: a PZ (Pozidriv) bit must not be used on PH (Phillips) cross-head screws, as this will strip the screw head. Alternatively, Euro screws (6.3 x 13 mm) are used in pre-drilled 5 mm hole lines.

Installation Steps (Ball Bearing Runner)

Separating the profiles: Pull the runner out completely. Press the small black plastic release lever inside the runner up or down to pull the inner profile completely out of the intermediate profile.
Fitting the carcass profile: Mark the height inside the carcass. Screw the outer profile horizontally onto the internal carcass wall. Use the slotted holes for fine vertical and horizontal adjustment.
Fitting the drawer profile: Screw the removed inner profile flush onto the outside of the drawer.
Insertion: Guide the drawer with the inner profiles accurately into the ball cages of the carcass profiles. Push the drawer fully closed with gentle pressure until the locking mechanism audibly engages.

FAQ – Frequently Asked Questions About Alcove Runners

Can I replace an old roller runner with a full extension runner? Yes, this is usually possible without issues, provided the lateral clearance between drawer and carcass is exactly 12.5 mm to 13.0 mm. The internal dimension of the carcass and the external dimension of the drawer must be measured before purchasing new runners.

Are there drawer runners that combine soft-close and push-to-open? On standard ball bearing runners, these two mechanisms are mutually exclusive due to their design. However, there are complex, concealed undermount runners in the premium segment that combine an automatic push-release with damped closing. For classic side-mounted ball bearing runners, you must choose one of the two functions.

What runner length do I need for a 30 cm deep cabinet? The internal carcass depth is the decisive factor. If this is, for example, 280 mm, the next smaller nominal length must be selected. In this case, drawer runners 250 mm would be the correct choice. The drawer itself is then also built with an external length of 250 mm.

Why is my drawer with full extension runners stiff to close? This is almost always a sign of incorrect installation dimensions. If the drawer is too wide, the ball cages of the runners are squeezed too tightly from the sides. Non-parallel installation of the runners inside the carcass (wider at the front than at the back) also causes severe friction and stiff running.