In machine shops, "1224" widely denotes a
12" swing by 24" distance-between-centers manual bench lathe (such as the
Universal Bench CZ1224 Lathe).
When finding an indexable tool holder for a 1224 lathe, you are restricted by the machine's maximum center height.
A 1224 bench lathe typically requires standard 1/2-inch (12mm) or 3/8-inch (10mm) square shank tool holders to properly align with the workpiece centerline without needing extensive height shimming.
2. Standard Indexable Tool Kits for a 1224 Lathe