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ColdsmithHearth 22
Fictional demoLaunch list
A rectangular stainless steel firebox assembled from six flat plates with flat tabs seated through slots at its corners, standing on a granite slab on wet gravel at blue hour, a bed of embers lighting its inner walls

Packs like a cutting board.
Burns like a forge.

Six stainless plates lock together by hand into a firebox 300 mm long and 150 mm deep. Pull them apart and they stack back into a 22 mm slab that slides behind a seat. There is no hinge to seize and no bolt to lose.

Email me at launchRead the spec

Folding fire pits fail at the hinge, and then the bag stays in the garage.

A hinge is a pin sitting in a barrel, holding two plates that get to 600 degrees and then get rained on. One wet winter and the pin welds itself into the barrel with rust, so the box opens to 80 degrees and stops.

Hearth 22 removes the part that fails. Six flat plates, four corner tabs, and gravity.

An old folding fire pit of blackened mild steel on a concrete garage floor, jammed half open because its hinge barrel is packed with rust, a rusted pin lying beside it
The failure is not the steel. It is the one moving part that was added to make the steel fold.
Six flat stainless steel plates stacked into one slab on a scarred steel workbench, a ground parallel block beside themThe base plate lying flat with two stainless side walls standing upright in its slots, forming an open UThe firebox fully assembled and square, with the cast iron grate resting on the upper internal railExtreme macro of one corner joint, a tab on the side wall seated hard against the bottom of a slot in the end wall

Six plates, four tabs.

Skip the assembly

Flat on the bench. 22 mm from face to face, grate on top.

  1. A

    Flat on the bench. 22 mm from face to face, grate on top.

  2. B

    Two walls stand and hook into the base. The ends drop in behind them.

  3. C

    The box closes square and the grate bears on the rail at 110 mm.

  4. D

    The tab sits in shear against the bottom of the slot, so heat cannot work it loose.

No tools, and nothing to lose in the dark.

Grate low for a sear. Grate high for a pan.

110 mm above the fuel bed

Slow heat under cast iron, clear of the flame.

The lower rail holds the grate 60 mm above the fuel bed, close enough to mark a steak. The upper rail holds it at 110 mm for slow heat under cast iron. Same grate, same box, one lift to change.

A black cast iron skillet resting on the grate at the lower rail, sixty millimetres above a bed of glowing embers, both internal rails visible as pressed ledges in the near wall
Lower rail, 60 mm. Both rails are pressed ledges in the wall, so there is nothing to bolt on and nothing to lose.

Pick where it has to live.

Packed, Hearth 22 is 22 mm thick, 300 mm long and 220 mm wide, and it weighs 5.1 kg with the grate in the stack. Choose a carrier and see the gap it needs.

Needs 25 mm/You have 34 mm

It goes in with 9 mm to spare.

Under the lid of a 39 litre aluminium case.

304 stainless, 1.5mm walls, cast iron grate.

Sheet this thin would oil-can under heat if it were left flat, so every plate carries a rolled 6 mm hem and one swage pressed down its centre. That is what keeps the walls straight through a season, and it is why the stack is 22 mm rather than 9 mm.

Hearth 22, as built
Wall material304 stainless, 1.5 mm
Wall stiffening6 mm rolled hem, single centre swage
GrateCast iron, 280 x 200 mm
Rails60 mm and 110 mm above base
Assembled300 x 220 x 150 mm
Packed300 x 220 x 22 mm
Packed weight5.1 kg with grate
FinishMill, unpainted
FastenersNone
Base, outer300 x 220Ash floor288 x 208Wall, long300 x 150Wall, long300 x 150Wall, end220 x 150Wall, end220 x 150

Six plates nested on one sheet. Tabs on the long walls, slots in the base and the ends, and no fastener anywhere on the drawing.

A used stainless firebox on wet gravel at blue hour, its outer walls bloomed straw-gold and grey-blue with heat oxide, inner corners caked with pale grey ash, cold and unlit

This is the same box, unpolished.

The outside blooms straw and grey-blue where the flame ran hottest. That colour is oxide, and it stops there. Ash cakes into the corner seams and comes out with a wire brush. The tabs still drop through the slots under thumb pressure.

First run is 500 boxes.

Leave an email and you get one message when the campaign opens, with the price, the ship window and the number left. Nothing before that.

One message when the campaign opens. Nothing before that. Demonstration form, nothing is sent and nothing is stored.

Hearth 22 and Coldsmith are a fictional product and brand, built by DuskLX to show how a hardware launch page holds together. Nothing here is for sale.

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