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Strongboxes are a type of block added by Thermal Expansion. They store items, exactly like Chests do, but with several benefits.

Strongboxes are harder to break and more resistant to explosions. They can also have Signalum Security Locks installed on them. Lastly, Strongboxes can be moved around without losing any stored items by dismantling them with a Crescent Hammer. They can only be opened when placed in the world, though.

To prevent creating infinite storage, as well as some world-corrupting issues, Strongboxes cannot store items that can also store items themselves, like other Strongboxes and Satchels.



Shaped Crafting
Hardened Strongbox

Shaped Crafting

Hardened Strongbox

Shaped Crafting
Reinforced Strongbox

Shaped Crafting

Resonant Strongbox

Shaped Crafting


Strongboxes follow Thermal Expansion's tier system. The tier of a Strongbox determines several of its properties: storage capacity, block hardness and resistance to explosions.

The Creative Strongbox can have an infinite amount of a certain item taken out of it. For obvious reasons, this Strongbox tier cannot be legitimately obtained.

The following table shows the block hardness and explosion resistance of Strongboxes per tier. For comparison, see Blocks by hardness and Blast resistance on the Minecraft Wiki.

Tier Hardness Blast resistance
Basic 5 15
Hardened 15 90
Reinforced 20 120
Resonant 20 120
Creative 1200


Strongboxes can be enchanted with the Holding enchantment to increase their capacity. This means that the capacity of a Strongbox depends on two things: tier and Holding enchantment level.

The following table shows how many storage slots Strongboxes have, depending on tier and Holding enchantment level.

Tier Unenchanted Holding I Holding II Holding III Holding IV
Basic 18 27 (Chest) 36 45 54
Hardened 36 45 54 (Large Chest) 63 72
Reinforced 54 (Large Chest) 63 72 80 88
Resonant 72 80 88 96 104

The Creative Strongbox always has only one slot, regardless of enchantments.


1. Inventory Slots
Any items stored in the Strongbox are displayed here. In the Creative Strongbox, this consists of only one slot; attempting to place an item in it will set it to provide an infinite amount of that item.
2. Information Tab
Displays a bit of information about the Strongbox.
3. Security Tab
Allows setting who is allowed to access the Strongbox. Only available if a Signalum Security Lock is installed.
4. Player Inventory
The inventory and hotbar of the player that is accessing the Strongbox.
Thermal Expansion
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Dynamos Steam Dynamo Magmatic Dynamo Compression Dynamo Reactant Dynamo Enervation Dynamo Numismatic Dynamo
Storage Energy Cell Flux Capacitor Portable Tank Cache Strongbox Satchel
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Dynamo Auxiliary Transmission Coil Fuel Catalyzer Transmission Coil Ducting Excitation Field Limiter Boiler Conversion Turbine Conversion Isentropic Reservoir Closed-Loop Cooling Ignition Plugs Elemental Catalyzer Lapidary Calibration
Other Florb (Magmatic) Coolants

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Last updated: 2017-10-23 18:27:19 +0000