Building a Floating TV Unit: Carcase Connectors, Push-to-Open & Cable Management

January 29, 2026

Because it lacks floor support, a floating TV unit strictly requires high-strength carcase connectors, heavy-duty wall hanging brackets, and the precise coordination of handleless push-to-open mechanisms and intelligent cable management.

Anyone planning or constructing a bespoke Hi-Fi unit faces particular structural and functional challenges. Units with a width of 140 cm, 240 cm, or even 250 cm generate enormous leverage forces on the wall and within the joints of the carcase. In order to make media equipment accessible without disrupting the minimalist look, selecting the exact hardware fittings is crucial. This guide walks you through the technical specifications of the required furniture components.

Key Purchasing Criteria for TV Unit Hardware

Constructing a wall-hung piece of furniture leaves no room for error when choosing fittings. The following parameters must be precisely defined before assembly:

Load capacity: An AV receiver and heavy power amplifiers easily weigh between 15 kg and 25 kg. Drawer runners and wall brackets must support this static load as well as the dynamic load during opening.
Dimensions and grid system: Planning is ideally carried out using the System 32 standard, where holes for shelf supports, hinges, and runners are drilled at 32 mm intervals. This ensures compatibility with standard fittings.
Door overlay type: For doors, you must distinguish between full overlay (the door completely overlays the carcase side), half overlay / twin overlay (two doors share a central partition), and inset (the door sits flush inside the carcase opening).
Extension type: For accessing rear equipment connections, a full extension runner (100% pull-out) is strictly preferable to a single extension runner (pulls out to only approx. 75%).

Carcase Connectors: Stability for Suspended Loads

Under load, a floating Hi-Fi cabinet behaves like a rigid lever on the wall – joints must permanently withstand tensile and shearing forces. Simply fastening with wood screws is often insufficient in heavy MDF or chipboard constructions to prevent tear-out.

For professional construction, cam and pin connectors (often known as Minifix) are used in combination with wooden dowels (typically 8 mm x 30 mm). The connecting bolt is screwed into a 5 mm hole, whilst the cam housing sits in a 15 mm blind hole. Tightening the cam pulls the joint tightly together without gaps. For very wide units (from 1400 mm upwards), structural centre partitions are mandatory and must be fixed with the same connectors to prevent the top panel from sagging.

Push-to-Open vs Soft-Close: Choosing the Right Hardware

A handleless appearance is the most distinctive feature of modern TV units, relying on mechanical release mechanisms. It is important to treat these mechanisms separately, as they operate on opposing technical principles.

Drawers and Pull-Outs

If the front is to pop open with a gentle press, you will need drawer runners push to open. This mechanism tensions an internal spring when closed and releases it upon pressing. For light to medium loads, standard ball bearing runners are sufficient. If the fitting needs to remain completely concealed, undermount drawer runners are the ideal choice.

If, on the other hand, traditional handles or integrated recessed pulls are fitted, soft-close damping is the preferred option. Drawer runners with soft close catch the drawer momentum over the last few centimetres and pull it shut silently. For storage sections holding heavy Hi-Fi separates or large collections of vinyl records, heavy duty drawer runners with a load capacity of 45 kg or more must be used.

Doors and Flaps

If side-hinged doors are planned, a handleless front requires unprung hinges combined with a separate push-to-open latch / buffer. For classic doors with handles, an opening angle of 110° is recommended. Standard concealed cupboard hinges 110 degrees easily cover standard TV unit requirements.

However, if internal pull-out drawers are concealed behind the door, the door must swing completely clear of the internal opening. For this purpose, concealed cupboard hinges 155 degrees (so-called wide-angle hinges) are strictly required.

When building a downward-opening drop-down flap, gas struts / gas stays are used. Their force is specified in Newtons (N). The required rating (e.g. 60 N, 80 N, or 100 N) is calculated based on the flap weight (including any handle) and flap height. An incorrectly sized strut will either let the flap drop uncontrolled or prevent it from closing completely.

Cable Management: Preventing Heat Build-Up and Tangled Wires

Media equipment generates waste heat and requires multiple power, HDMI, and audio cables. When a low unit is mounted flush against the wall, cable routing must pass directly through the carcase.

For this purpose, cable grommets and tidies are recessed into the top panel, base panel, or back panel. Standard drill diameters are 60 mm or 80 mm. For a high-end finish and improved heat resistance near amplifiers, a metal cable grommet is recommended. These typically feature a brush seal that keeps dust out whilst holding cables securely in position.

Which Fitting for Which Scenario? (Decision Guide)

To ensure proper furniture functionality, the hardware must be tailored exactly to its application:

If the TV unit is wider than 140 cm and has no centre partitions, then thicker board materials (from 22 mm) and heavy-duty carcase connectors must be selected to prevent sagging.
If a completely sleek, handleless front is desired, then choose push-to-open runners and unsprung hinges.
If heavy AV receivers need to be operated inside a drawer, then fit a full extension runner rated to at least 45 kg, ensuring rear terminals remain accessible at 100% extension.
If the unit must stand on the floor after all (e.g. due to stud walls), then use low, height-adjustable plinth feet to compensate for floor unevenness to the millimetre.

Installation Notes for the Hi-Fi Unit

Precision and the right tools are essential for the professional assembly of the carcase and hardware.

Required tools:

Cordless drill/driver with TX and PZ bits
Forstner bits (35 mm for hinge cups, 60 mm / 80 mm for cable outlets)
Wood drill bits (5 mm for system holes, 8 mm for dowels)
Spirit level and tape measure
Joiner's square

Assembly sequence:

Drill the holes: Drill all blind holes for cam connectors (15 mm) and wooden dowels (8 mm) into the carcase sides and panels.
Prepare cable paths: Cut the holes for cable grommets using a Forstner bit or hole saw in the relevant panels.
Pre-mount hardware: Attach the cruciform mounting plates for concealed hinges and the carcase rails for drawer runners to the side panels while they are still lying flat on the workbench.
Glue/join the carcase: Insert wooden dowels with a little wood glue, assemble the side panels and base/top panels, and tighten the cam connectors using a screwdriver.
Insert back panel: Slide the back panel (typically 3 mm to 5 mm HDF) into the pre-routed groove or screw it into place. This provides the carcase with crucial racking stability.
Wall mounting: Secure the unit to the wall using heavy-duty cabinet hanging brackets.
Hang the fronts: Clip the doors onto the mounting plates using clip-on technology or click the drawers onto the runners. Finally, align the panel gaps using the 3D adjustment screws on the hinges.

Frequently Asked Questions (FAQ)

What load capacity do drawer runners need in a TV unit? For simple accessory drawers (remote controls, cables), 25 kg to 30 kg is sufficient. If Hi-Fi components, game consoles, or extensive physical media collections are stored, runners with a 45 kg load rating are required.

Can I combine push-to-open and soft-close? As standard, these systems are mutually exclusive because soft-close dampens the momentum, whereas push-to-open requires a firm stop to re-tension the internal spring. While specialised high-end hybrid mechanisms exist on the market, conventional fittings cannot be mixed.

What opening angle should the hinge have? For standard doors on a lowboard unit, an angle of 95° to 110° is entirely sufficient. Only when an internal pull-out drawer is installed behind the door must a 155° hinge be used, preventing the open door from obstructing the drawer path.

What size hole is needed for a standard concealed hinge cup? The standard cup diameter for furniture hinges is 35 mm. The drilling depth is typically 11.5 mm to 12 mm. The distance from the edge of the hole to the edge of the door (drilling distance) typically ranges from 3 mm to 6 mm depending on the required door reveal.