Installing Cam Lock Connectors: Joining Cabinet Panels in the 32 mm System

October 6, 2025

A cam lock connector is a two-part furniture fitting consisting of a cam housing and a connecting bolt, designed to join panel materials at a right angle with a strong, demountable mechanical lock.

Building cabinets, shelving units and chests of drawers requires joints that can withstand high loads while guaranteeing the precise alignment of components. In professional furniture manufacturing and interior fit-out, cam lock connectors have established themselves as standard hardware. Unlike glued joints or basic screws, they allow the cabinet carcase to be disassembled without causing any damage.

This technical guide is written for fitters and joiners. It covers precise positioning, required drilling specifications, and the installation of carcase connectors in strict accordance with the 32 mm system.

Technical Parameters and Preparation

Before drilling begins, fitting dimensions must be matched precisely to the chosen board thickness. The most common panel thicknesses in furniture construction are 16 mm and 19 mm. The cam housing typically has a diameter of 15 mm. The connecting bolt is usually screwed into a 5 mm drilled hole (Euro thread) or requires an insert nut when working with softer materials.

Key Installation Data:

Difficulty Level: Advanced (requires high drilling accuracy)
Time Required: approx. 10 to 15 minutes per corner joint
Load Type: Tensile force and shear force (the latter ideally absorbed by additional wooden dowels)

Required Tools and Materials

Sharp tooling is essential for clean, tear-out-free holes in chipboard or MDF.

Drill or high-performance cordless drill/driver
Forstner bit (Ø 15 mm) for the cam housing
Wood drill bit (Ø 8 mm) for the edge-drilled bolt passage
Wood drill bit (Ø 5 mm) for the bolt thread
Depth stop for all drill bits
Drilling jig or dowelling guide (compatible with the 32 mm system)
Screwdriver with PZ2 or PZ3 drive (Pozidriv)
Vernier calliper and marking gauge

Step-by-Step Guide: Installing Cam Lock Connectors

The mechanics of this joint work like a mechanical puzzle: the head of the bolt engages with the open cam housing, which pulls the bolt tight via a rotational movement, clamping both panels together without gaps. The following steps outline a standard corner joint for a cabinet carcase.

Step 1: Marking Out the 32 mm System

The 32 mm system is an international standard in cabinet making. Rows of holes have a vertical pitch of 32 mm. The front row of holes sits exactly 37 mm back from the front edge of the carcase.

Mark the positions for the connectors on the inner faces of the side panels and on the surfaces of the structural shelves. The drilling distance from the edge depends on the length of the bolt used. Standard drilling centres for the cam are usually 24 mm or 34 mm from the front edge of the shelf.

Step 2: Drilling the Blind Hole for the Cam Housing

The cam housing is recessed into the structural shelf. A Forstner bit is used for this operation.

Fit the depth stop onto the drill bit. Drilling depth is critical. In a 16 mm thick panel, the hole is typically drilled to a depth of 12 mm to 12.5 mm. The centre point of the bit must never penetrate through the outer face of the panel.
Position the centre point of the bit exactly on the marked cross-point (e.g. 34 mm from the edge).
Drill into the material at high speed but with low feed pressure. This prevents chip-out at the edges, especially on melamine-faced boards.

Step 3: Edge-Drilling for the Connecting Bolt

To allow the bolt to reach the cam housing, a channel must be drilled from the edge of the shelf into the previously drilled blind hole.

Use the 8 mm wood drill bit.
Mark the centre of the board thickness on the panel edge (for a 16 mm board, this is exactly at 8 mm).
Drill horizontally into the edge until the drill bit breaks through into the 15 mm blind hole. Using a drilling guide is highly recommended here to prevent the bit from wandering.

Step 4: Drilling for the Connecting Bolt in the Side Panel

The mating side panel is prepared next. This is where the connecting bolt is anchored.

Transfer the position accurately onto the side panel. In the 32 mm system, use the pre-drilled system line (37 mm from the front edge).
Use the 5 mm wood drill bit (for bolts with Euro threading).
Set the depth stop to match the thread length of the bolt (usually 11 mm to 13 mm deep).
Drill the hole into the side panel at a precise 90° angle.

Step 5: Fitting the Hardware Components

Once all holes are drilled, component installation can begin.

Screw the bolts into the 5 mm holes in the side panels using a PZ2 screwdriver. The collar of the bolt must sit flush against the board surface. Avoid overtightening to prevent stripping the threads in chipboard.
Press the cam housings into the 15 mm holes in the structural shelves. There is a small arrow on top of the housing; this arrow must point directly towards the edge through which the bolt enters.

Step 6: Assembling and Locking the Carcase

Slide the structural shelf against the side panel so that the head of the bolt passes through the edge hole and into the centre of the cam housing.
Insert the screwdriver into the cam housing.
Turn the cam clockwise by roughly 180°. You will feel noticeable resistance as the cam engages the bolt head and pulls the panels together.
The joint is complete once the panels are drawn flush without gaps.

A completely square and rigid carcase is essential before fitting moving components. Only when cabinet sides are parallel can drawer systems be installed and adjusted smoothly.

Common Mistakes and Professional Tips

Even with careful work, tolerances can cause issues. Keep an eye out for these potential errors:

Tear-out on Melamine Edges: When the 8 mm drill bit enters the panel edge, the surface coating can chip easily. Tip: Apply masking tape over the edge first and begin drilling with a very sharp bit at high rotation speed.
Cam Does Not Tighten: If the cam housing turns continuously without pulling the panels together, the drilling distance from the edge is too large. The cam cannot catch the bolt head. If available, using a longer bolt is the only remedy.
Panel Misalignment: Cam lock joints resist high tensile forces but are susceptible to shear forces. Tip: Place an 8 mm wooden dowel next to every connector. The dowel maintains precise alignment and absorbs shear loads, while the cam provides clamping force.

Frequently Asked Questions About Fitting Connectors

Can cam lock joints be disassembled repeatedly? Yes. Unlike glued joints or standard wood screws that degrade the core material each time they are driven in, this mechanism operates metal-on-metal. The carcase can be assembled and dismantled as often as required.

Which thread type is better suited to MDF? While Euro threads can be driven directly into dense chipboard, MDF tends to split along its edges. For MDF, it is advisable to use bolts with metric machine threads (M4 or M6) paired with threaded insert nuts.

Why does the cam housing sit proud of the panel surface? This happens when the 15 mm blind hole has not been drilled deep enough. Check the depth stop on your Forstner bit. The housing must sit completely flush with the panel surface or slightly countersunk (approx. 0.5 mm) to prevent friction against adjacent components.