Fallout 4 junk items

General information
Junk items are found in their own inventory section in the Pip-Boy. Their main use is for crafting, either as components used to create other objects, or for breaking down into more useful components. After activating a crafting station at a settlement, all junk items can be automatically transferred into it and are available for crafting at the settlement and all settlements connected to it via a supply line.

Crafting components
 The 31 crafting components are the most basic junk items which can be used to craft other items, and cannot be broken down into other items.

Although some instances of the following items exist in the game world, they are more commonly obtained by scrapping other items. Additionally, shipments providing larger quantities can be bought from several vendors and are weightless.

When scrapping other junk items, you will always receive the components specified. However, when scrapping other items such as... ...you will only receive a fraction of the components which were originally used to craft the item. The types and amounts of components received in these cases is determined by two factors: rarity and scrap scalar.
 * Weapon mods, but only when attached to weapons
 * Armor mods, but only when attached to armor
 * Static objects created in the workshop.

Rarity has four possible values:
 * Common: these components are always received
 * Uncommon: Scrapper rank 1 is required to receive these components
 * Rare: Scrapper rank 2 is required to receive these components
 * Zero yield: these components are never received - only applies to adhesive and oil

Additionally, the original amount of components used to craft the item is multiplied by the scrap scalar, rounding down, when determining the amount of components received.

Other junk items
Legend

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