In America, the most common thickness for the face board (also known as the drawer front) of cabinet drawers is typically 3/4 inch (19 mm). This thickness provides sufficient durability and stability while maintaining a sleek appearance.
As for the frame board (also referred to as the drawer box or sides), it is usually made of a thinner material, typically 1/2 inch (13 mm) thick. The frame board provides structural support to the drawer and is often made of plywood or particleboard.
It's important to note that while these thicknesses are common, there can be variations depending on the manufacturer, cabinet style, and customization options. Some higher-end or custom cabinets may use thicker materials for added durability and a more substantial feel. Additionally, specialty cabinets or unique designs may have different thickness specifications to accommodate specific requirements or design preferences.