Jach class
The Jach class was a type of battle cruiser used by the Klingon Empire during the mid-23rd century. It was similar to the , but could be differentiated by the presence of a third, central hull between the two outer hulls.

At least one vessel of this class fought in the  of 2256-57, starting with the Battle of the Binary Stars in 2256. ()

Klingon starship classes