Gear
Smithing an ingot down the '2 gears' or '4 gears' pattern makes Iron or Steel Gear at the anvil, and every engine and pump recipe here that takes a rusty gear has a twin that takes this one instead. Mistake: it is not the same item as Spur Gear or Cast Iron Bevel Gear, which the shaft-power line uses for its own drive train rather than for an engine.

Made by
Smithing: Ingot (Iron or Steel) makes Iron Gear x 2
Needs: 1 Ingot (Iron or Steel); makes 2 Iron Gear
Smithing: Ingot (Iron or Steel) makes Iron Gear x 4
Needs: 1 Ingot (Iron or Steel); makes 4 Iron Gear
Amounts are the mod's defaults; the recipe-cost level changes them (see recipe cost levels).