Oak Slab

Overview

Oak Slab counts as a building block in Minecraft 1.21.4. Oak Slab has a crafting recipe, so it is renewable as long as you can source its ingredients. At a hardness of 2 it takes a moment to break but never slows a build down.

Broken correctly, it drops itself. Sixty-four fit in one inventory slot. The recipe calls for Oak Planks.

It is an ingredient in 5 recipes, among them Barrel, Chiseled Bookshelf, Composter and 2 more.

About the oak set

Oak is the wood every player meets first, and the whole set behaves the same way: planks, stairs, slabs, fences, doors, trapdoors, signs, buttons and pressure plates share one hardness of 2, one blast resistance of 3, and one rule — an axe is faster but never required, and every piece drops itself. What separates the woods is colour and, for two of them, availability: oak and birch generate in the starting biomes, while cherry, mangrove and pale oak need a specific biome to be found at all. Because the recipes are identical across the set, anything you learn here transfers: four planks make a crafting table, six make a door, six make three trapdoors. The one place they differ is fuel — every wooden item burns in a furnace for 15 seconds, and a set of stairs is worth exactly as much fuel as the planks it was made from, so smelting with leftover stairs is never wasteful.

How long it takes to break

Oak Slab sits at hardness 2: 3 seconds per block with your fists, 0.35 with the correct netherite tool.

Iron takes 0.5 seconds against diamond's 0.4, so the upgrade worth making for this block is the one to iron.

The drop does not depend on the tool — bare hands work as well as anything — so the table below is purely about speed.

The Efficiency formula is level² + 1 added to tool speed — at V that is about 3.5 times the unenchanted rate.

Tool	No enchantment	Efficiency III	Efficiency V
Hand	3 s	3 s	3 s
Wooden	1.5 s	0.25 s	0.15 s
Stone	0.75 s	0.25 s	0.1 s
Iron	0.5 s	0.2 s	0.1 s
Diamond	0.4 s	0.2 s	0.1 s
Netherite	0.35 s	0.2 s	0.1 s
Golden	0.25 s	0.15 s	0.1 s

Properties

Oak Slab resists blasts at 3, which usually is not enough when something explodes nearby. Light does not pass through it, and it emits none of its own. A single slot takes 64, the usual full stack. Fire spreads to it readily (encouragement 5, burn 20), so keep it away from lava and away from anything you would rather not lose. The fastest tool for it is an axe; any other kind of tool mines it no faster than a bare hand does, because the speed bonus only applies to the tool class the block is tagged for. As furnace fuel it burns for 7.5 seconds — 0.8 smelting operations.

Transparent: No
Required tool: Any
Flammable: Yes (5/20)
Fuel value: 7.5 s