Screw 4x60

Self-tapping screw 4.0×60mm, used for fastening housing components. Depending on the model, it secures different structural elements.

Application

The screw secures housing components of the unit – on the 115-185 models it works within the housing and handle, while on the therm CA it secures the burner fan cover in the combustion chamber.

Symptoms – when to replace

• The thread in the plastic or sheet metal is worn and the screw spins without tightening.
• The screw head is broken off or the driver socket is stripped.
• The fan cover or housing panel is loose despite all screws being present at that location.
• Visible corrosion of the shaft making removal difficult during disassembly, especially in the therm CA combustion chamber.

How to choose the right part

Selection is based on reference number 43420 and the 4.0×60mm size – the screw is used in different locations depending on the model, so the catalog number is a more reliable reference than the mounting location alone.

When ordering for the therm CA, count carefully – on this model, 4 pieces are used at the fan cover, while on the 115-185 models only 2 pieces are used in the housing.

[faq]

Does the same screw fit both the plastic housing and the metal fan cover on the therm CA?|Yes, the size and thread type are the same – the self-tapping screw works both in a hole in plastic and in the thinner sheet metal of the fan cover.

The screw spins when removing the fan cover on the therm CA – what should I do?|Check the condition of the mounting hole in the fan housing – if the thread is damaged, using a screw with a slightly larger diameter in the same hole helps, rather than looking for a new mounting point.

Is a special driver needed for installation, or is a standard Phillips enough?|The screw has a standard Phillips socket – a typical screwdriver or drill/driver with a PH2 bit is enough for installation, no specialized tools are needed.

[/faq]