How to Forge an S-Hook (Your First Real Project at the Anvil)

Why the S-hook, and what you need

The S-hook earns its place as everyone's first project because it is tiny, genuinely useful, and made almost entirely of the two moves you will use forever: drawing out a taper and bending a curve. Get one under your belt and coat hooks, pot hooks, fire tools, and half of what hangs in a workshop suddenly feel possible.

You need very little. A short length of mild steel is the star: 3/8 inch (roughly 10 mm) round or square bar, cut to about five or six inches. Ask for A36 or 1018 at a steel supplier and you will pay very little; both are soft, cheap, and move sweetly under the hammer. Skip mystery scrap and anything springy or hardened for now, because a first hook should not fight you.

Beyond the steel, you want a heat source (a small propane or coal forge), an anvil with a horn for bending, a hammer of around a pound and a half to two pounds, a pair of tongs that actually grip your bar, and a bucket of water nearby. Square bar is slightly kinder to a beginner than round because it will not roll under the hammer, so if you have the choice, start there. If you are still assembling that kit, the full blacksmithing hobby guide covers what to buy and roughly what it costs; from here on we will assume the basics are in front of you and focus on the making.

Forging the hook, step by step

Bring the bar up to a bright orange, almost yellow heat before you touch it with the hammer. Then work in this order:

• Taper the first end. Rest the last inch of the bar on the far edge of the anvil at roughly a 45 degree angle, and swing with the hammer face angled to match. You are trying to squash the tip thinner, not just flatten it. After every two or three blows, rotate the bar a quarter turn so you draw all four faces down evenly. Keep going until that end runs from the full 3/8 inch down to about 1/16 inch over roughly the last three inches.
• Round off the corners. Once the square taper is the right length, lay it flat and knock the four sharp corners back to make eight facets, then keep rotating to bring it close to round. A rounded tip looks finished and is friendlier to hang things on.
• Reheat, then repeat on the other end. The steel stops moving as it cools. The instant it fades to a dull red, put it back in the fire, bring it up to heat, and carry on. Taper and round the second end exactly like the first, matching the length so the finished hook is symmetric.
• Bend the two curves. Lay a tapered end across the horn at the spot where the horn's diameter gives you the curve you want, and bend it down with a series of light, walking blows, moving along the curve rather than hammering one spot. Flip the bar and bend the other end the opposite way. Those two opposing curves are your S.
• Finish it. While the hook is still warm but no longer glowing, scrub off the flaky grey scale with a wire brush. Then wipe or dip the warm metal in oil, or rub it with paste wax, for a soft black finish that keeps rust away. Mild steel will not harden, so there is no quench and temper step to worry about.

Reading the heat so you do not ruin the steel

Color is your thermometer, and learning to read it is the real skill hiding inside this project. For mild steel, the useful forging window runs from a bright cherry or orange (very roughly 1,600 to 1,800°F) up into a bright yellow (around 1,900 to 2,100°F). Heavy drawing goes fastest at the hotter, yellow end; finishing blows and gentle bends are fine down in the orange.

The two edges of that window are where beginners come unstuck. Work too cold, below a dull red, and the steel simply refuses to move; you end up pounding away, achieving nothing, and you can start tiny cracks in the surface. If the metal is not spreading under normal blows, it is not stubborn, it is cold, so stop and reheat. Push too far the other way and you reach a white heat with little sparks fizzing off the surface, which is the steel actually burning. A burned spot goes grainy, crumbly, and permanently ruined, so back the heat off well before you see fireworks.

Expect to reheat several times for a single hook. A beginner might get maybe twenty to forty seconds of good working time per heat, and that is normal. Pull the bar, work until it fades to dull red, and put it straight back. Chasing one more blow out of cold steel is the single most common way to waste a piece.

Common beginner mistakes

Nearly every first hook goes sideways in one of a few predictable ways. Knowing them in advance turns most of them into non-events.

• Forging too cold. The big one. Cold steel does not move, so you hammer harder, get frustrated, and risk cracking the surface. If normal blows are not spreading the metal, reheat instead of swinging harder.
• Burning the steel. The opposite error. If you see sparks fizzing off a white-hot bar, the surface is burning and that spot is ruined. Pull it a little sooner and keep to the orange and yellow range.
• Not rotating evenly. Forget to turn the bar a consistent quarter turn and your taper drifts to one side, giving you a hook shaped like a banana. Pick a rhythm, such as a quarter turn every two blows, and stick to it.
• Bending the curve in one spot. Trying to form the whole curve with a couple of hard blows gives you a kink, not an arc. Walk the bend around the horn with lots of light taps.
• Hitting the anvil, not the work. Missing the bar and striking the bare anvil face dents both the face and your hammer. Only let the hammer land where there is hot steel underneath it.
• Mismatched ends. Taper the two ends to different lengths and the S comes out lopsided. Glance at the first end and roughly match it when you draw the second.
• Leaving the scale on. Skip the wire brush and the flaky scale gets hammered into the surface as little pits. A quick brush between heats keeps the finish clean.

None of these mean you lack the knack. They are all habits, and every one gets easier the second or third time around.