Square vs Round Ground Chainsaw Chain: Which One Should You Buy?

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Square vs round ground chainsaw chain: the short answer

Buy round ground for firewood duty. A square-ground chisel chain cuts fast and clean in green, straight-grained wood, but its keen corner dulls quickly when it meets dirt, bark grit or frozen bark. Round-ground cutters, and especially the semi-chisel profile on all three chains in the gear section below, hold their edge longer in exactly the rough conditions firewood comes in. Unless you are falling clean timber for a living, the round grind costs you less sharpening time over a season.

What square ground means

Square-ground chain carries chisel cutters filed with a square file, so the cutting corner is a sharp, flat edge rather than a rounded one. In clean wood it shears fast and throws long shavings, which is why professional fellers reach for it. The price of that speed is fragility: the sharp corner is the first thing to go when the chain kisses dirt, and square filing is a skill of its own. Most firewood cutters never see a square-ground chain on their saw, and that is fine.

What round ground means

Round-ground chain is filed with a round file. On a full chisel cutter that round file still leaves a sharp, square working corner, which is what makes full chisel the aggressive member of the family; semi-chisel rounds that corner further, so it stays sharp longer in dirty or frozen wood and is easier to file back to shape. All three chains in the gear section below are semi-chisel, the forgiving profile these listings offer for ordinary saws: a cutter that keeps working between sharpenings. For the wood burner, that is the sweet spot.

Which grind suits firewood cutting

Firewood is rarely clean. Yard trees carry grit in the bark, storm wood sits on the ground, and even bought logs drag dirt from the landing. That is the whole argument for round ground: the cutter survives the wood you actually cut. Square ground earns its keep in clean, professional falling, where speed pays and the wood is straight. Match the grind to the wood, not to the saw: a small saw running a sharp round-ground chain will outcut a big saw dragging a dulled square-ground chain through dirty rounds. All three chains below are semi-chisel, so whichever one fits your bar, you are buying the right grind for the woodpile.

Three replacement chains for the woodpile

Listed from the most saw to the least, because bar length decides which one is yours:

• Loggers Art Gens 16 inch chain: the full-size pick of the three. The listing states 3/8 inch low-profile pitch, .043 inch gauge and 55 drive links, a semi-chisel cutter in German steel with Japanese chrome plating, hardened and quenched rivets, and protective oil against corrosion. It ships as a 2-pack and is listed to fit Stihl MS170, MS171 and MS180c saws plus Ryobi, Makita and Oregon 90PX055G replacements. Nothing in the listing contradicts itself, and the stated specs cover everything a buyer needs to match a 16 inch bar.
• Oregon S33: the pole-saw pick. The title and bullets state an 8 inch bar, 3/8 inch low-profile pitch, .050 inch gauge and 33 drive links, with Oregon’s LubriTec oiling system and a low-kickback, low-vibration design for saws up to 42cc, fitting Greenworks, Sun Joe, Wen, Husqvarna and Chicago Electric models. One wrinkle: the spec table’s Specifications row says 62 drive links, which contradicts the 33 in the title and bullets; trust the title and bullets. The chain is listed at 4.96 ounces.
• KAKEI GTA26: the mini-pruner pick. The listing states a 3-pack of 4 inch chains, 1/4 inch pitch, .043 inch gauge, 28 drive links and semi-chisel cutters to fit the STIHL GTA 26, with German steel, Japanese chrome-plated cutters, hardened and quenched rivets and protective oil. The listing states the chain meets ANSI B175.1-2012 kickback requirements and CSA Z62.3. One small wrinkle: the spec table rounds the gauge to 0.04 while the title and bullets state .043 inch; trust the title and bullets.

Frequently Asked Questions

Can I run a square-ground chain on my firewood saw?

You can, but there is little reason to. Square-ground chisel rewards clean wood and skilled filing, and firewood gives it neither most days. A round-ground or semi-chisel chain stays sharp longer in bark and dirt, which is most of what a woodpile asks of a chain.

Is a semi-chisel chain slower than full chisel?

In clean wood, a little: the rounded corner does not bite as aggressively as a full chisel point. In dirty or frozen wood the semi-chisel keeps cutting long after the keener chain has dulled, so over a day of cutting the difference often disappears. For firewood, durability beats peak speed.

How do I match a chain to my saw?

Read three numbers off your old chain or the guide bar: pitch, gauge and drive link count. All three must match; a chain with the right pitch and gauge but the wrong drive link count will not fit the bar. The listings above show the format: the KAKEI is 1/4 inch pitch, .043 inch gauge and 28 drive links, and the Oregon S33 is 3/8 inch low-profile pitch, .050 inch gauge and 33 drive links. When in doubt, check the saw’s manual.

What does low-kickback mean on a chain listing?

It means the chain’s cutter and guard design is made to reduce the force of kickback, the sudden upward snap when the bar tip catches. The KAKEI listing states it meets ANSI B175.1-2012 kickback requirements, and the Oregon and Loggers Art Gens listings both describe low-kickback designs. It does not make a saw safe on its own: chaps, a helmet with face screen and hearing protection, gloves and boots are still the uniform.

Can I sharpen these chains with a round file?

Yes. All three listings describe semi-chisel cutters, which are sharpened with a round file, and that is the standard way to keep a firewood chain cutting. See our best chainsaw sharpener guide for file sizes and jigs that match these chains.

Related guides

Keep the chain sharp with the best chainsaw sharpener guide, find the right loop for a longer bar in best 16 inch chainsaw chain, and start from the saw itself with best chainsaw for firewood.