Bits and pieces of metal scrounged from various sources.
In-game description

Scrap metal is a material in The Long Dark.

It is used to repair and craft certain tools.

Too much metal in the inventory can quickly weigh you down.

Scrap metal can be found in the world or obtained by breaking down certain metal objects like toasters or metal shelves with a Hacksaw. Harvesting certain inventory objects will also yield metal, but this is not recommended unless the object is ruined.

Hides Black bearDeerMooseRabbitWolf
Other Crow featherCured leatherGut
Medicinal Old man's beard lichenRose hipReishi mushroom
Sapling Birch saplingMaple sapling
Wood Cedar firewoodFir firewoodReclaimed woodStick
Miscellaneous Arrow shaftArrowheadClothScrap metal