Iron Ingots, Details and Kits

Iron production opens in stages: Smithing mastery 5 for Iron Ingots, 6 for Iron Details and 7 for Iron Kit I. The ability to smelt an ingot does not establish that the same setup can produce the kit used in later construction.

Check the failed stage

Blocked product	First requirement to inspect
Iron Ingot	Iron technologies, Furnace II access and effective Smithing 5
Iron Details	The proper anvil setup and effective Smithing 6
Iron Kit I	The kit recipe and effective Smithing 7

Read the full ingredient and extension requirements in the recipe interface. A missing station extension is not corrected by adding raw ore; insufficient mastery is not corrected by stocking more fuel.

Effective mastery can come from equipment

A better applicable tool and a scoped perk can close the gap without another permanent talent level. Razeg’s firsthand progression used Heat Handler to meet higher iron requirements. Check that the perk applies to the current activity rather than counting every bonus as general Smithing.

If a worker is making the item, inspect that worker’s mastery rather than the Keeper’s. A strong personal hammer does not grant its bonus to the zombie. Its training points also belong to that worker, so replacing it with a newly raised body can remove the very mastery that made the previous queue work.

Keep fuel and delivery separate

The Furnace needs an available fuel supply in its own area. A Firewood Shed in a different area does not automatically supply every underground or home station. Once fuel and inputs arrive, the worker or assistant must still satisfy the craft requirement.

Update 1.011 allows assistants to start and finish Furnace autocrafts when qualified. That improves the cycle; it does not remove the recipe’s mastery threshold.

For early components, Bronze Nails and Details explains why the first nails need no Furnace. For manufactured kits moving through the underground factory, check production troubleshooting after confirming the iron recipe itself works.