What Is the Longest Chainsaw Bar You Can Buy?

"Longest" means something different depending on who has to run the bar, so the answer depends on which length you are asking about.

The 59 inch bar is the longest one that maker sells in the US, and it is listed for its largest saw only. That saw's own product page markets it as taking up to a 41 inch guide bar, while the maker's saw-chain selection chart lists bars to 59 inches. The two figures describe the length the saw is sold and marketed with, and the longest bar the maker's own chart approves for it.

The 60 inch figure comes from the fit-up guide and from dealer packages that pair the largest saw with a 60 inch bar and a skip-tooth chain. The US spec table lists 42 inches as the recommended maximum, which is the everyday recommendation rather than the outer limit.

The 84 inch bar is a milling bar, not a felling bar. It is a one-piece solid bar with a replaceable nose, and its maker asks for a saw of at least 110 cc, warning that a smaller saw may be damaged. The 144 inch bar is a milling bar in the strict sense: it is built to carry two powerheads, or one powerhead and a helper handle with an idler roller and a chain tensioner, and it needs an auxiliary oiler unless a second powerhead supplies the oil.

Anything over 36 inches counts as a long bar, and only large professional saws belong there.

You can fit a longer bar only up to the maximum bar length rated for that exact model, and only if the bar mount, chain pitch, chain gauge, drive-link count and oil pump all line up. The published fit-up data for the saws that actually carry long bars shows how wide the spread is.

For the rest of the market, engine displacement gives a rough idea of where a saw sits. Treat this as a guide only, because the model-specific chart always wins.

Some saws tolerate a 2 to 4 inch increase over the bar they are sold with, and no more. A 66 cc saw sold with a 20 inch bar is commonly run at 24 inches, and that is about the limit of what the engine and oiler will carry well.

Battery saws, which run roughly 18 to 80 V, and corded electric saws top out around 16 to 20 inches and are not designed for longer bars. Gas saws under 60 cc sit in the same band. If your goal is reach for pruning high limbs, the right tool is a pole saw, not a longer bar on a small saw.

A bar that fits the mount but not the chain, or the chain but not the oiler, will run badly or not at all.

Bar mount and tail pattern

The bar's tail must match the saw's mount. Long aftermarket bars often use a universal mount with adaptor plates to fit different makers' large saws. A bar that needs an adaptor and does not get one will not oil or tension correctly, and the chain will run loose or dry.

Pitch, gauge and drive links

All three must match the saw's sprocket and the bar. A pitch change means a sprocket change as well. Read the numbers off the stamp on the bar's tail rather than working them out from the length, because two bars of the same length can take different chains.

Oiler capacity

The oil tank and pump, not the engine, often decide how long a bar a saw can really run. The manual for one maker's largest saw sets the oiler by bar length: no adjustment at 24 to 28 inches (61 to 71 cm), up to 1¾ turns at 42 inches (107 cm) and longer, with a maximum pump output of about 1.8 fl oz (54 ml) per minute. Long double-ended bars need an auxiliary oiler kit unless a second powerhead supplies the oil.

Chain type

Long bars run full-skip or semi-skip chain to reduce the load and clear chips, and milling setups run ripping chain. The largest maker offers no low-kickback, green-labelled chain in .404 inch, so every long-bar setup is a yellow-labelled chain.

Bars over 36 inches exist for jobs a short bar cannot reach or cannot finish in one pass.

Milling

Milling is the main reason bars this long are made. An 84 inch bar in a matching Alaskan-style mill cuts about 76 inches of width once the mill's clamps are allowed for, which turns a big trunk into slabs without a sawmill.

Felling and bucking very large timber

Cutting through a trunk wider than the bar is the domain of 120 cc class saws. A bar shorter than the trunk means cutting from both sides and hoping the cuts meet.

Stump and ground-level work

Some owners run a longer bar than the wood needs simply to reach the cut without bending over, for stumps and low limbs. The bar does no more cutting than a short one here, but the working position is easier on the back.

Long bars put leverage on the saw. They can crack crankcases and bar rails, which is why some aftermarket makers cap certain mounts well below their longest catalog length. Never pry with the bar.

Weight and balance matter as much as power. A 32 inch bar adds roughly 3.5 to 5 lb to the saw, and an 84 inch bar is about 30 lb before the powerhead goes on. A long bar on an undersized saw is a handling problem first and a power problem second.

A longer bar only cuts faster if the powerhead can hold chain speed. When it cannot, the saw bogs, runs hot and cuts slower than it did with the shorter bar, which is the usual answer to why a saw struggles after a bar swap.

A longer bar also has a larger nose zone and more exposed chain, so kickback exposure goes up, not down. A long bar is not a safety upgrade, and it does not make a small saw safer to use.

Long bars demand more upkeep. Keep the oiler at maximum, keep the groove clean and flip the bar regularly, replace the drive sprocket every three chains, and keep the depth gauges set for the chain type you run.

A bar's labeled length is not its cutting length. A "20 inch" bar cuts roughly 18 to 19 inches. The largest maker states on its own bar pages that the listed guide bar length can vary from the effective cutting length depending on which powerhead it is installed on.

For milling, the usable width is the bar length minus the mill's clamps, which is why an 84 inch bar cuts about 76 inches. Size the bar to the wood plus a couple of inches, not to the number on the label.

Length is the biggest driver. Price climbs steeply past about 36 inches, because bars over that length are low-volume, solid-steel items, often in titanium alloy, with replaceable noses.

Construction separates the tiers. The short end is a laminated consumer bar for a homeowner saw. The middle is a solid professional bar in the 36 to 60 inch band for a large saw. The top is an 84 inch single-ended or a double-ended milling bar, where the bar, the helper handle, the auxiliary oiler and the skip or ripping chain are separate purchases.

Mount and adaptors add cost too. A universal-mount bar plus adaptor plates costs more than a direct-fit bar, and a bare bar costs less than a bar-and-chain package with the correct drive-link count already matched.