How to Sharpen an Axe and a Knife in the Field: Stones, Files, and the Angles That Matter (2026)

Short answer: An axe is sharpened with a file to shape and a coarse stone to finish, at about 25 degrees per side. A knife is sharpened on a small stone at 15 to 20 degrees per side, coarse then fine. Both take five minutes once you have the motion. The whole field kit is a 6-inch mill file and a pocket stone, and it turns a dull blade into a working one at camp instead of at home next month.

The kit

• A 6-inch mill bastard file, for axes
• A double-sided pocket stone, coarse and fine, for knives and axe finishing
• A rag and a little oil or water for the stone
• Gloves; you are pushing a file at an edge

Sharpening an axe

1. Brace the axe head on a stump or log, edge facing away, handle held by your knee or a strap
2. File from the edge toward the poll, in one direction, following the existing bevel. Ten to fifteen strokes per side. The file cuts on the push stroke only; lift it on the return.
3. Keep the angle at roughly 25 degrees per side. Too thin an edge chips on knots; too fat will not bite.
4. Check for a burr along the whole edge with a thumbnail. When you feel it the length of the blade, switch sides.
5. Finish with the coarse side of the stone in small circles along the edge, then the fine side, a few passes each side, to remove the burr.

The XF132 is 65# manganese steel at HRC 60-65, which files slower than a soft hardware-store hatchet and holds the edge longer; expect a few more strokes and less frequent sharpening. The XF12 in 45# carbon steel files fast and takes a keen edge quickly. Both benefit from a wipe of oil on the head after.

Sharpening a knife

1. Wet or oil the stone
2. Hold the blade at 15 to 20 degrees to the stone, edge leading, and draw it across in an arc so the whole edge from heel to tip touches
3. Ten strokes per side on coarse, alternating sides, until a burr forms
4. Ten lighter strokes per side on fine to remove the burr and polish
5. Strop on a leather belt or the back of a jeans leg, edge trailing, a few passes each side

Stainless like the 3Cr13 in the compact cleaver and the olive wood folder sharpens quickly on a stone and does not rust when you put it away wet; it will not hold an edge as long as harder steel, so touch it up more often. The knife steel guide explains the trade.

The angle, and how to hold it

Consistency beats precision. Pick an angle and keep it for every stroke; a wobbling 20 degrees is worse than a steady 25. A trick: two stacked coins under the spine of a pocket knife on a stone is close to 15 degrees; a matchbook is about 20. For an axe, the existing bevel is your guide; follow it.

Testing the edge

• Paper: a sharp knife slices printer paper cleanly; a dull one tears it
• Shaving: an axe should shave a curl off the end grain of a dry stick
• Never test on a thumb

Keeping it sharp

• Chop wood, not dirt and rocks; a stump under the log saves the edge
• Sheath it; the XF132 ships with a leather one for exactly this
• Oil carbon and manganese steel after use; dry stainless
• Touch up before it is truly dull; five strokes now beats fifty later

Frequently asked questions

What angle do I sharpen an axe at?
About 25 degrees per side for a splitting and chopping hatchet. Follow the existing bevel.

What angle for a knife?
15 to 20 degrees per side. Steady matters more than exact.

Can I sharpen an axe with just a file?
Yes for shaping and a working edge. A few passes on a coarse stone after removes the burr and makes it cleaner.

How often should I sharpen a camp knife?
Touch it up whenever it stops slicing paper cleanly. Stainless like 3Cr13 needs it more often than hard steel but sharpens faster.

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