PZ vs PH vs TX: Which Screw Drive for Furniture Construction?

December 5, 2025

The PH drive (Phillips) centres the tool in the screw head, the PZ drive (Pozidriv) provides extra grip against slipping thanks to additional ribs, whilst the TX drive (Torx) allows the highest torque transmission without axial contact pressure.

Choosing the Right Drive in Furniture Making

When assembling carcasses made of chipboard or MDF as well as fitting hardware, the screw drive determines the efficiency and precision of your work. The wrong drive or an ill-fitting bit combination leads to damaged screw heads, slipping tools, and, in the worst case, scratches on the decor.

For professional furniture making and the secure fixing of fittings, three primary drive types are considered for wood screws and furniture screws: Phillips (PH), Pozidriv (PZ), and Torx (TX). The choice depends on torque, the material, and the accessibility of the installation point.

What Do PH, PZ, and TX Mean?

The three profiles differ fundamentally in their geometry and the way they transfer force from the cordless screwdriver or manual tool to the thread.

PH Drive (Phillips)

The classic cross-recess. It features tapered flanks. This shape was originally developed to keep the tool centred in the screw during automated assembly. The drawback: as torque increases, the wedge shape pushes the bit out of the screw head. This process is known as the cam-out effect. To counteract this, the installer must apply high axial pressure. Typical sizes in furniture making are PH1 and PH2, with wood screws PH2 frequently found with slightly thicker diameters.

PZ Drive (Pozidriv)

The PZ drive is a further development of the PH profile. In addition to the main cross, the screw head features four additional, fine radial lines offset by 45°. The flanks of the main cross run parallel here rather than tapered. This significantly reduces the cam-out effect. The bit sits more securely, and less contact pressure is required. In the realm of chipboard screws, the PZ drive, particularly with wood screws PZ2, remains a widespread standard for mounting fittings.

TX Drive (Torx / Hexalobular)

The hexalobular profile has the shape of a six-pointed star with rounded tips. Torque transmission occurs across a surface rather than at points. A TX drive meshes like a precision gear, whereas a simple cross-recess relies on constant downward pressure to avoid slipping out. Because the flanks are vertical, there is practically no cam-out effect. Wear on both bit and screw is minimal, even at high torque levels.

The Differences: PH vs PZ vs TX

For a quick overview, the mechanical properties of the three drives can be compared as follows:

Torque transmission: TX offers maximum torque transmission. PZ is moderate, whilst PH only allows lower torque transmission before the bit slips.
Required contact pressure: Strong downward pressure on the power tool is mandatory for PH. PZ requires medium pressure, whilst TX needs virtually no axial contact pressure.
Wear: Bit and screw wear is highest with PH, moderate with PZ, and extremely low with TX.
Centring: PH and PZ automatically centre the bit very well. With TX, the bit must be aligned precisely, but then holds without play.

Which Drive for Which Application?

The choice of profile depends on the component, the screw diameter, and the installation situation.

Carcass Assembly and Structural Joints

When screwing cabinet sides made of solid wood or thick chipboard, long screws are necessary. This is where high driving resistance occurs. The TX drive is the logical choice here, as the screw can be countersunk flush without immense effort.

Fitting Hardware: Hinges and Runners

Mounting metal hardware, such as a concealed hinge or a full-extension runner, is generally done using short screws. PZ drives dominate here. For standard holes in fittings, wood screws 4mm or wood screws 3.5mm are mostly used. A countersunk head is often selected to sit flush inside the metal fitting. Alternatively, a round head (pan head) is used if the fitting material is not chamfered. As standard, these fixings are supplied as zinc wood screws to prevent corrosion.

Fine Work and Thin Material Thicknesses

When installing delicate components, thin back panels, or small hinges, wood screws 3mm are frequently utilised. A PZ1 or PH1 drive is entirely sufficient here, as the required torque is very low.

Visual Requirements

If the screw head remains visible in the piece of furniture, aesthetics play a role. For dark decors or black powder-coated fittings, black wood screws are used. For white carcasses, white screws are chosen. Another solution for cross-recess profiles is matching cover caps, which push into the PZ or PH recess and conceal the metal head flush.

Common Installation Mistakes

The most serious mistake in furniture making is confusing PH and PZ bits. If a PH bit is used in a PZ screw, the tool will have play. The parallel flanks of the PZ screw will be stripped by the tapered PH bit on the very first turn. Conversely, if a PZ bit is pressed into a PH screw, the bit will not seat deeply enough into the screw head because the bit's extra ribs get in the way. The result is immediate slippage and surface damage.

FAQ – Frequently Asked Questions

How do I recognise the difference between a PH and a PZ screw? A PZ screw (Pozidriv) features four additional, fine star lines etched between the four main slots of the cross. A PH screw (Phillips) only has a plain, smooth cross.

Can I use an Allen key for Torx screws? No. The hexagon socket profile (Allen) has straight edges, whereas the hexalobular profile (Torx) is star-shaped with rounded tips. The tools are incompatible and will ruin the screw head if used incorrectly.

Which diameter is typical for fitting furniture hardware? For mounting hinge plates and drawer runners in System 32, chipboard screws with a diameter of 3.5 mm or 4.0 mm are typically used. The length is usually 15 mm to 17 mm to avoid penetrating through 18 mm thick chipboard.

Why does the bit keep slipping out when driving screws? This is the classic cam-out effect, which mostly happens with PH screws when axial contact pressure is too low. It can also be caused by a worn bit or the wrong bit size (e.g. PZ1 instead of PZ2).