This is a drawbar from a milling machine. It has a 5/8-11 thread for an nmtb40 style tool holder that is popular on cnc machines that use a manual drawbar system instead of the newer automatic pull stud style holders. This is mostly seen on older machines but also still used for newer lower end units to keep cost down. The length from the tip to under the head would detemine what model this bar fits which varies by brand and machine size.

This is a drawbar from a milling machine. It has a 5/8-11 thread for an nmtb40 style tool holder that is popular on cnc machines that use a manual drawbar system instead of the newer automatic pull stud style holders. This is mostly seen on older machines but also still used for newer lower end units to keep cost down. The length from the tip to under the head would detemine what model this bar fits which varies by brand and machine size.

References:

https://www.bscsource.com/ProductDetails/5-8-Inch-Hole-Diameter-5-8-11-Drawba...