Adamantite nails are nails made with an adamantite bar on an anvil with a hammer in the player's inventory, requiring 74 Smithing, yielding 15 adamantite nails and granting 62.5 Smithing experience per bar.
Adamantite nails can be used to construct certain types of wooden furniture. With 56 Construction, five adamantite nails can be used along with two teak planks to repair broken bridges in the Hallowed Sepulchre, granting 450 Construction experience; without a hallowed hammer in the player's inventory, there is a chance of failing to repair the bridge and breaking nails in the process. With 62 Fletching, they can be used on flighted ogre arrows to create adamant brutal arrows, granting 10.2 Fletching experience per arrow. With 76 Crafting, fifteen adamantite nails can be used with a magic shield and two pieces of red dragon leather to craft a red d'hide shield, granting 156 Crafting experience per shield.