Tractor friction discs, commonly referred to as clutch discs, come in a variety of sizes depending on the make and model of the tractor, as well as the specific application and design of the clutch system. The size of a friction disc is typically determined by its outer diameter, inner diameter, and thickness. These measurements can vary significantly between different tractor manufacturers and models.

To provide a general idea, I can give you a range of possible dimensions for tractor friction discs. Keep in mind that these measurements are approximate and may not cover all possible variations:

Outer Diameter: 6 inches (150 mm) to 14 inches (355 mm) or more.

Inner Diameter (center hole): 1 inch (25 mm) to 2.5 inches (64 mm) or more.

Thickness: 0.25 inches (6 mm) to 1 inch (25 mm) or more.

These dimensions are just rough estimates and may not apply to all tractor models. It’s important to consult the manufacturer’s specifications or documentation for the specific tractor model you’re interested in. Tractor manufacturers or dealerships can provide accurate information about the correct size and type of friction discs needed for a particular tractor’s clutch system.

When replacing or selecting friction discs, it’s essential to ensure that they match the specifications required for your tractor’s clutch assembly. Mismatched sizes or incompatible parts can lead to clutch slippage, reduced performance, and potential damage to the tractor’s drivetrain.