Stone Hammer is one of the most basic type of tools that is required to craft some items. One example of those items is Wood Block crafted by merging Wood Planks by Tacks. One needs Hammer Time 1 perk to use it. Its almost same as steel hammer but used for more basic crafting recipes. For crafting steel things one needs steel hammer later on. For more information about the recipes that require Stone Hammer one may check Item And Crafting Tables page or Crafting page in wiki. You may also check the official website for the recipes that require Stone Hammer.
How to obtain
Stone Hammer is obtainable by Crafting.