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Mild Steel Hex Bar Forged in the Swage Block
Forge

Created by

Forge

14. October 2026NO
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Mild Steel Hex Bar Forged in the Swage Block

A swage block has shapes round its edge, each with a matching top swage. Lay a hot round bar in the block's half-hexagon, set the top swage with the other half on it, and strike: turning the bar between blows forges it to a hexagon, the stock for nuts and bolt heads. First forge the top swage itself. The picture: a smith's swage block, with holes through it and shaped notches round its edge.
Intermediate
A day

Instructions

1

Forge the top swage

Forge a short block of tool steel, fuller and file a half-hexagon groove in its face matching the block's notch, and punch an eye for a handle. Shave an ash handle and fit it.

Materials for this step:

Octagonal Tool Steel BarOctagonal Tool Steel Bar1 piece
Ash BilletAsh Billet1 piece
CharcoalCharcoal2 as required

Tools needed:

Blacksmith ForgeBlacksmith Forge
AnvilAnvil
Cross Peen HammerCross Peen Hammer
FullerFuller
Hot PunchHot Punch
Metal FileMetal File
Blacksmith TongsBlacksmith Tongs
Welding GlovesWelding Gloves
Safety GlassesSafety Glasses
2

Choose the rod

Take round rod a little larger than the hex across the flats (step 5 gives the size that holds the same metal).

Materials for this step:

Mild Steel RodMild Steel Rod1 m
3

Swage to a hexagon

At a bright orange, lay the rod in the half-hexagon notch, set the top swage on it and have a striker hit it. Turn the bar a sixth of a turn between blows and work along it a little at a time.

Materials for this step:

CharcoalCharcoal4 as required

Tools needed:

Blacksmith ForgeBlacksmith Forge
Swage BlockSwage Block
Top SwageTop Swage
SledgehammerSledgehammer
Blacksmith TongsBlacksmith Tongs
Welding GlovesWelding Gloves
Safety GlassesSafety Glasses
4

True it

Straighten the bar on the anvil at a dull red, and file the flats where they are uneven.

Tools needed:

AnvilAnvil
Cross Peen HammerCross Peen Hammer
Metal FileMetal File
5

Round rod for a hex bar

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Materials

4

Tools Required

12

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