Three Types of Disc Harrows

Disc Harrows are a set of discs, mounted in "gangs" underneath a (usually heavy) frame, and pulled by a drawbar, or mounted to the 3-point linkage in the case of smaller speed discs.

These are ideal for rocky ground where a robust implement is required to stand up to the conditions, or cutting into ground that is heavily thatched where the blades can slice through the stringy plant matter.

There are mainly three types of Disc Harrows, the most popular is Offset Disc, followed by Tandem Disc, and Speed Disc. 

Ø Offset Disc is the most cost-effective option relative to width when it comes to discs, with the least complexity. Their basic design has been around for 80-90 years, and this makes the components and wearing parts competitive and readily available. Offset Disc is among the best offered, with frame strength being a key focus. The design includes features like huge 50mm high tensile pivot pins, 9mm wall RHS, large 40mm square 4140-grade axles, and triple-sealed roller bearings just to name a few.

Ø Tandem Disc is very similar to Offset Disc, but it has the gangs set up in an X shape. When turning with Offset Disc, the shape of the disc blades means that they ride up and out of the ground, or dig in too deeply. The Tandem Disc rectifies this problem by mounting the discs in an X configuration, keeping the implement in the ground working, even when turning. Tandem and Offset Discs both offer full hydraulic cut adjustment as standard.

Ø Speed disc is a relatively new development compared to the other two variations. They require a special type of disc blade and different bearing and mounting setups to the Offset or Tandems to be suited to be pulled at high speeds without causing excessive wear and tear. In light or sandy soils, discs may also be used as a finishing tool where a finer seedbed would dry out and blow away.