Front Extension Pull-Out as an Alternative to Hettich — Compatible & Fitting

A front extension pull-out rigidly connects the furniture front to the runner system, allowing direct access to the entire contents of the cabinet in a single pulling motion.

When a runner system jams in the kitchen or workshop, the soft-close fails, or a new carcase is being planned, the question of suitable fittings frequently arises. Anyone looking for a replacement for Hettich or a cost-effective alternative to Hettich for installing a waste bin system does not necessarily need to rely on identical product ranges. What matters for smooth operation is not the brand name, but the exact technical specifications: installation dimensions, load capacity, runner type, and drilling pattern.

This guide is aimed at installers and experienced joiners looking to replace or install front extension pull-outs professionally.

What to Look Out for Regarding Compatibility of Front Extensions

A precisely adjusted front pull-out functions like the chassis of a heavy commercial vehicle — it secretly absorbs high dynamic forces, guides the load without sideways play, and tracks straight over thousands of movement cycles. For a new system to work smoothly in an existing carcase as an alternative to Hettich, three technical parameters must match.

1. System 32 and the Hole Pattern

Most modern furniture carcases are based on System 32. This means that the rows of holes in the side panels feature a vertical spacing of exactly 32 mm. The distance from the front edge of the carcase to the centre of the first drilled hole is typically 37 mm. When replacing runners, check whether the new under-mount drawer runners support this standard hole pattern. If they do, the existing drill holes in the carcase can be reused directly.

2. Clear Internal Width and Carcase Width

When retrofitting, particularly when installing waste bin systems, the cabinet width is the critical dimension. The nominal width (external cabinet dimension) determines the choice of pull-out. The actual clear internal width is calculated by taking the nominal width minus twice the side panel thickness (usually 16 mm or 19 mm chipboard). For standard standard-sized cabinets, select suitably dimensioned systems:

• A kitchen cabinet pull-out 60 cm is suitable for wide sink base units with large waste separation systems.
• For narrower recesses or compact waste sorters, opt for a kitchen cabinet pull-out 40 cm.

3. Nominal Length of the Runner

The nominal length (NL) describes the depth of the runner when fully closed. Common lengths in the kitchen range from 250 mm - 600 mm. When replacing a defective runner, measure the old runner in its closed position. A runner with a nominal length of 400 mm can easily be replaced with 400 mm drawer runners, provided the internal depth of the carcase accommodates it (usually nominal length + 3 mm to 5 mm tolerance).

Suitable Runner Systems for Professional Use

Anyone planning or repairing complete drawer systems must define the physical requirements placed on the runner.

Full Extension vs. Single Extension

A single extension runner can only be pulled out of the carcase by around 75%. The rear section of the drawer remains hidden inside the cabinet. A full extension runner, on the other hand, extends 100%. Particularly for front extension waste bins, a full extension runner is essential to remove the rear bins without difficulty. Upgrading from single to full extension is straightforward if the hole pattern matches. Matching full extension drawer runners provide complete access here.

Load Capacity for Heavy Fronts

A front pull-out carries not only the weight of its contents, but also the often heavy MDF or solid wood front panel. Standard runners are designed for around 25 kg to 30 kg. For wide pots or heavy waste bins in a 60 cm cabinet, this is often insufficient. Here, fittings from the heavy-duty drawer runners category are required, which can handle dynamic loads of 45 kg or more without twisting.

Damping and Opening Mechanisms

Movement support mechanisms must not be confused during planning:

• Soft-Close: An integrated hydraulic damper catches the drawer over the final few centimetres and pulls it shut gently and silently. This protects the material and prevents the front from slamming. Compatible soft-close drawer runners are the standard in modern kitchens.
• Push-to-Open: A mechanical release that pushes the drawer out slightly with a light press on the front. This is used for handleless fronts. Because the system must build up counter-tension, it is mechanically the exact opposite of damping. Suitable push-to-open drawer runners strictly require a gap of 2 mm to 3 mm between the front and the carcase to ensure the trigger travel works.

Installation and Retrofitting: Step by Step

Installing a new front extension suitable for Hettich drilling patterns requires precision.

Required tools:

• Cordless screwdriver with PZ or TX bits
• Wood drill bit (5 mm for Euro screws)
• Spirit level and folding rule
• Screwdriver for 3D adjustment

Step-by-step guide:

1. Dismantling: Detach the front panel from the old runner system. Remove the old runners from the carcase.
2. Check hole pattern: Hold the new runners against the existing row of holes (37 mm from the front edge). If the holes align, secure the runner using Euro screws (5 mm pre-drilling). If not, re-measure the height and drill new holes.
3. Fit runners: Mount the carcase runners perfectly level on both sides.
4. Drawer sides and front connection: Mount the front brackets (fixings) onto the back of the furniture front. Ensure you follow the exact spacing dimensions according to the technical drawing of the new system.
5. Clip into place: Place the drawer on the runners and slide it backwards with gentle pressure until the catches audibly engage. Attach the front panel to the drawer sides.
6. 3D adjustment: Use the adjustment screws on the drawer sides to align the front in height, side-to-side, and tilt, until the gap pattern runs completely parallel to adjacent cabinets.

Additional Fittings Compatibility

If a kitchen refurbishment involves upgrading stays and doors alongside drawer runners, similar compatibility rules apply.

Gas Struts for Lift-Up Flaps

If you are looking for a replacement for a defective gas strut (often searched under names such as Lift-o-Mat 380N), the extension force is the key factor. This is measured in Newtons (N). A gas strut rated at 380 N supports exactly the same load, regardless of the manufacturer. Also measure the overall length from ball joint to ball joint in the fully extended position. A new gas strut with 380 N and the same length is fully compatible with Hettich fittings of this specification.

Concealed Cup Hinges

Finding an alternative to Hettich for hinges is equally straightforward. A standard concealed cup hinge requires a 35 mm diameter hole drilled into the door. Pay attention to the overlay type: a full overlay is used when the door fully covers the carcase side panel. For special corner cabinets (e.g. bi-fold doors), wide-angle hinges with an opening angle of 135° or 165° are required. As long as the cup diameter (35 mm) and overlay type match, the hinge and mounting plate can be replaced without issue.

Frequently Asked Questions (FAQ)

How do I determine the correct length for my new front pull-out? Measure the length of the old runner in its fully closed position. Alternatively, measure the internal carcase depth. The runner should be roughly 5 mm to 10 mm shorter than the carcase depth. Standard sizes include 400 mm, 450 mm, or 500 mm.

Can I replace a single extension runner with a full extension runner? Yes. As long as the nominal length of the runner and the internal installation width inside the carcase match, you can upgrade the system. This is particularly recommended when retrofitting waste bin systems.

Are the drill holes for the front fixing standardized? The drill holes on the carcase sides usually follow System 32 and are often compatible. However, the drilling patterns on the back of the front panel (for the front fixings) vary by manufacturer. Usually, new pilot holes (2 mm or 3 mm deep) must be pre-drilled to screw in the new front brackets.

What does the "N" rating on gas struts mean? The "N" stands for Newtons and specifies the force rating of the gas strut. 10 N roughly corresponds to a lifting capacity of 1 kg. If your old strut indicates 380 N, you must select a replacement with exactly 380 N so that the flap neither drops shut nor shoots upwards uncontrollably.