Soft-Close & Dampers — How It Works

Soft-close technology (furniture damping) decelerates moving furniture components such as doors or drawers just before closing and pulls them gently and silently into their final position using an integrated spring mechanism.

Modern furniture fittings rely on hydraulic or pneumatic damping cylinders to control the kinetic energy of cabinet doors and pull-outs. At its core, the system consists of two components: a tension spring that pulls the component over the final few centimetres, and a fluid-filled or gas-filled cylinder that generates resistance. Just like a shock absorber on a car, this cylinder absorbs the impact energy and converts it into a smooth, decelerated motion.

This guide provides a detailed breakdown of how different damping systems operate in cabinet making. The focus is on technical design, dimensional specifications for installation, and the correct selection of fittings based on mounting type and load rating.

Types and Styles of Furniture Damping

The integration of damping systems varies depending on the type of fitting. The design determines how the component is installed and adjusted.

Soft-Close Concealed Hinges

The concealed hinge (cup hinge) is the standard fitting for cabinet doors. In modern designs, the damping cylinder sits directly inside the hinge arm or concealed within the hinge cup. When the door reaches a specific angle (usually from 30° before closing), the mechanism engages. The spring pulls the door shut while the cylinder cushions the closing motion.

For cabinet making, concealed hinges / cabinet hinges with damping (Soft Close) are manufactured with various opening angles. The standard for ordinary cabinet doors is 110°. If internal drawers are fitted, hinges must be used that clear the internal cabinet opening completely. Wide-angle hinges are used here, such as concealed hinges / cabinet hinges 165 degrees or 155°. For corner cabinets (bi-fold doors) or angled carcases, specialised angles exist such as concealed hinges / cabinet hinges 135 degrees or 45°.

Drawer Runners with Damping System

On drawers, the damping unit usually sits in the rear third of the guide rail. An activator pin on the drawer engages with the spring-loaded damper block on the runner during closing.

A fundamental distinction must be made between runner extension types. A full-extension runner pulls out 100% from the carcase, ensuring the entire drawer contents right up to the back panel are fully accessible. A partial-extension runner leaves around 25% within the carcase. For maximum convenience, soft-close drawer runners are mostly designed as full extension.

The runner technology varies:

• Ball bearing runner: The slide rails glide on steel ball bearings. They are mounted to the sides of the drawer box and offer high lateral stability.
• Undermount runner: The rails sit concealed beneath the drawer base. They provide outstanding running properties and conceal the hardware completely.
• Roller runner: A straightforward system with plastic rollers that is rarely combined with full hydraulic dampers, but rather with a mechanical self-closing feature.

Important for planning: Soft-close and push-to-open are opposing mechanisms. Soft-close dampens the closing motion and pulls the drawer shut. Push-to-open drawer runners (tip-on) push the drawer open via spring force when pressed. Combining both systems within a single runner is technically complex and requires specialised, synchronised fittings.

Clip-On Dampers and Door Buffers

For older cabinets without built-in damping, retrofit solutions are available. Clip-on dampers are clipped onto the arm of an existing hinge after installation. Alternatively, cylindrical door dampers can be drilled into the carcase side panel or surface-mounted using an adapter housing. They cushion the door as it closes, but do not feature the tension spring of a genuine soft-close hinge.

Gas Struts for Lift-Up Flaps

For upward-opening cabinet flaps (e.g. wall units), gas struts (gas springs) control the movement. They assist in opening the flap and hold it in position. The force of these struts is specified in Newtons (N). The damping during closure is created by the resistance of the compressed gas inside the cylinder.

How to Choose: Finding the Right Damped Fittings

Selecting the suitable damping system requires precise knowledge of the dimensions, weight of the furniture components, and the desired kinematics.

Criteria for Hinges

The most crucial factor for a hinge is the door overlay type. It defines how the door sits relative to the carcase side panel:

1. Full overlay: The door completely covers the front edge of the carcase side panel.
2. Half overlay: Two doors share a single central carcase partition. The crank of the hinge arm is more pronounced.
3. Inset: The door sits flush within the carcase opening between the side panels. The hinge arm has a high crank.

The cup drilling diameter for the hinge cup is generally 35 mm. The drilling depth is usually between 11.5 mm and 13 mm. In addition to the overlay type, the opening angle must be considered. For standard applications, a concealed hinge / cabinet hinge 110 degrees is sufficient.

Criteria for Drawer Runners

When selecting damped runners, three parameters are decisive: installation length, load capacity, and extension type. Nominal runner lengths typically range from 250 mm - 800 mm. The runner length must match the clear carcase depth and the drawer box depth.

Load capacity is especially critical for wide drawers. Standard ball bearing runners often carry up to 30 kg or 45 kg. For heavy workshop units or larder pull-outs, heavy-duty drawer runners must be used, which handle loads from 60 kg upwards while still providing effective damping.

Furthermore, decide between full-extension drawer runners for complete access and partial-extension runners for simpler requirements.

Criteria for Gas Struts

The force of the gas strut must be matched exactly to the flap weight (including handle) and the flap height. If the damper is too weak (e.g. 50 N for a large MDF flap), the flap will drop shut. If it is too strong (e.g. 120 N for a small, lightweight flap), it will be difficult to close or may pull the hinges straight out of the chipboard.

Applications in Cabinet Making

Damped fittings are used across different rooms and furniture types to resolve specific technical demands.

Kitchen Cabinetry

In the kitchen, pull-outs and doors are subjected to the highest stresses. Wide pan drawers and heavy crockery require robust runners. A typical kitchen cabinet pull-out 60 cm quickly exceeds 20 kg when fully loaded. Here, damping prevents plates and cookware from rattling together when a drawer is pushed shut carelessly. On narrower base units designed for a kitchen cabinet pull-out 40 cm or a kitchen cabinet pull-out 50 cm, the soft-close system protects the front edges of the carcase from impact.

Wardrobes

Large wardrobe doors made from MDF or solid timber carry significant weight. If such a door slams shut unchecked, it produces a loud bang and transfers vibration throughout the carcase. For doors with a height of around 160 cm or more, at least three to four hinges are fitted. It is often sufficient for two of these hinges to feature integrated soft-close to safely cushion the heavy door.

Bathroom Furniture

Handleless designs and minimalist fronts dominate modern bathrooms. Here, damping delivers a premium feel. Because bathroom vanities are frequently wall-hung, the gentle closing of drawers minimises vibrations exerted on the wall fixings.

Installation and Technical Guide: Installing Damping Systems

Accurate installation is essential for the smooth operation of damping cylinders. If fittings are installed out of square or under tension, the mechanism binds and the damping loses its effectiveness.

Tools Required

• Cordless drill/driver
• Forstner bit (35 mm) for hinge cups
• Wood drill bit (5 mm or 3 mm) for pilot holes
• Screwdrivers or drive bits: PZ (Pozidriv) or PH (Phillips) size 2. (Note: do not mix up PZ and PH to prevent damaging screw heads).
• Folding rule / tape measure, try square, pencil

Step-by-Step: Installing Soft-Close Concealed Hinges

1. Marking the cup hole: The distance from the door edge to the centre of the cup hole (the cup distance / drilling distance) usually lies between 3 mm and 6 mm depending on the hinge model.
2. Drilling: Drill approximately 12 mm deep using the 35 mm Forstner bit. A pillar drill or drilling jig prevents drilling through the front face.
3. Inserting the hinge: Align the hinge perpendicular to the door edge and secure it with countersunk wood screws (typically 3.5 x 16 mm or 4 x 16 mm).
4. Positioning the cruciform mounting plate: Mount the base plate onto the carcase side panel. In the System 32 standard, the front row of holes is located exactly 37 mm from the front edge of the carcase. The hole spacing is 32 mm.
5. Clipping on and adjusting: Hook the hinge arm onto the mounting plate and click into place. Use the adjustment screws on the hinge arm to align the door reveal (lateral adjustment, depth adjustment, height adjustment).

Step-by-Step: Installing Soft-Close Drawer Runners (Ball Bearing)

1. Separating the runners: Operate the release lever on the ball bearing runner to separate the inner slide rail (fitted to the drawer box) from the outer carcase rail.
2. Fitting the carcase rail: Screw the outer rails perfectly level and parallel to the inside faces of the carcase. The System 32 grid pattern also assists with alignment here.
3. Fitting the drawer rail: Screw the inner slide profile centrally along the outside faces of the drawer box. The front edge of the profile should sit flush with the drawer front.
4. Inserting the drawer: Guide the drawer box with its fitted inner rails into the carcase profiles. An audible click confirms that the retaining mechanism has engaged.
5. Testing the damping: Open the drawer fully several times and close it firmly to prime and calibrate the damping cylinder and tension spring.

Frequently Asked Questions (FAQ)

What is the difference between soft-close and self-closing? A standard self-closing mechanism pulls the drawer shut over the last few centimetres using only spring tension, without braking it. The closure can be abrupt. Soft-close combines this tension spring with a hydraulic damper that decelerates the movement. For basic applications, hardware from our drawer runners with self-close category is often entirely sufficient.

Why is my soft-close drawer stiff to open? When opening the drawer, the tension spring within the damping unit must be cocked. This initial resistance is standard for this design. If the resistance feels excessively high, the runners may be misaligned or the weight capacity of the runner may be over-specified for a very light drawer.

Can soft-close and push-to-open be combined? As standard, these systems are mutually exclusive. Push-to-open requires tension to be built up during closure to eject the drawer on the next press, whereas soft-close pulls the drawer shut. Specialised, premium synchronised mechanisms exist that combine both functions, but these are complex specialised solutions.

How many soft-close hinges do I need per door? This depends on the weight and height of the door. On a standard kitchen door with two hinges, fitting a single soft-close hinge is often adequate. On heavy doors using four hinges, at least two soft-close hinges should be installed. Many modern hinges feature a switch on the hinge cup to deactivate the damper if the door closes too slowly.

Can I retrofit dampers onto older furniture? Yes. Clip-on dampers are available for many standard concealed hinges and clip directly onto the hinge arm. Alternatively, universal piston-style door dampers can be installed by drilling into the carcase front edge (10 mm hole) or by using a screw-on adapter casing.

Why does damping perform less effectively in winter? Hydraulic dampers contain oil. At lower temperatures (e.g. in unheated workshops or garages), the viscosity of the oil increases, making it thicker. Consequently, the cylinder brakes more heavily, causing the door to close extremely slowly or fail to shut completely. At normal room temperature, this effect disappears.

What does System 32 mean? System 32 is the international standard in cabinet making and furniture hardware. It specifies that hole rows in carcase side panels are spaced 32 mm apart. The hole diameter is typically 5 mm. The distance from the front edge of the carcase to the first line of holes is always 37 mm. Virtually all modern fittings conform to this modular grid.

Related Categories and Guides

To find the appropriate hardware system for your project, explore our specialised product ranges. If you are looking for unsprung or standard hinges without damping for simple projects, browse our concealed hinges / cabinet hinges selection.

For bespoke corner layouts and angled carcases, explore our categories for concealed hinges / cabinet hinges 30 degrees and concealed hinges / cabinet hinges 90 degrees.

In drawer slide hardware, alongside ball bearing systems we also provide roller runner drawer slides, which are especially suited for lightweight keyboard pull-outs or small desk drawers.