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.

General information
* Concrete shipment also has a shipment of 200 with ID

The unit price of a component, when bought as a shipment, is several times its "base" unit price, sometimes even overpricing the value of a simple source item containing the component. Also, the game does not offer any rebate for large shipments (= no quantity rebate). Therefore, it is not necessary to spare money waiting the opportunity for buying big shipments over small ones. E.g: 2 shipments of 100 concrete yield the same overall price as a single shipment of 200. Buying small shipments also allows building defenses gradually for settlements that are not yet connected between each other, and at a lower cost.

The concrete, steel and wood components constitute the 3 base building components for all the major craftable structures in the settlements (e.g. floors, walls, roofs, stairs). Their values, although claimed to be all 1, are respectively 1, 2, and 3 when considering their respective shipments. For this reason, the cost for building each craftable structure can vary largely, and can affect or determine which structure is favored over the others, especially when the amount of money (caps) is currently limited and... there is an hurry for building up the defenses for a given settlement.

Base game
Legend

Far Harbor
Legend

Vault-Tec Workshop
Legend

Nuka-World
Legend

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