What is a bow saw?
A bow saw is a hand saw built around a bowed tubular-steel frame that stretches a thin, coarse-toothed blade tight between two pins. The rigid frame keeps the blade straight, so the blade can be thin and aggressive, cutting wood on both the push and the pull stroke.
What are the parts of a bow saw?
A bow saw has three main parts:
- The frame — a tubular steel or aluminium bow, often D-shaped, that carries the blade and often a knuckle guard.
- The blade — a long (usually 21 to 30 inch), coarse, replaceable strip of toothed steel.
- The tensioner — a cam lever or wingnut that pulls the blade taut and lets you swap it in seconds.
How does a bow saw work?
A bow saw works by using frame tension to hold a thin blade rigid, so it cuts straight without the thick, stiff spine of a traditional handsaw. Flipping the tension lever bows the frame slightly and pulls the blade tight between its pins, and that tension is what stops the blade buckling under load.
Because the blade is tensioned rather than rigid on its own, it can be thin, which means it removes less wood per stroke and cuts faster for the effort. The coarse teeth cut on both the push and the pull, and their deep gullets carry sawdust out of the kerf so the blade keeps biting. Release the tension and the same thin blade drops straight out for replacement.
What is a bow saw frame made of?
Most modern bow saw frames are made of tubular steel, prized for stiffness and low cost, while lighter folding and camp models use aluminium or aluminium-and-composite frames to save weight. The material choice trades rigidity against portability rather than changing how the saw cuts.
A steel frame is heavier but holds a big blade dead straight through hard cuts, which is why woodpile saws favour it. An aluminium folding frame flexes a little more but packs flat and shields its blade, which is why backpackers favour it. Either way the frame is usually powder-coated or painted to shrug off sap and slow rust, and it is built to outlast many blades.
What else is a bow saw called?
A bow saw goes by several names. The classic Swedish tubular design is often called a Swede saw, and older take-down versions with wooden H-shaped frames are known as buck saws or bucksaws. Folding aluminium models made for camping are usually just called folding bow saws.
How is a bow saw different from other frame saws?
A bow saw differs from other frame saws mainly in blade length and coarseness: it carries a long, coarse wood-cutting blade, where a hacksaw carries a short, fine metal-cutting blade and a coping or fret saw carries a very fine, narrow blade for curves. All stretch a replaceable blade across a frame, but each is tuned to a different material and cut.
The bow saw's long blade and deep frame are built for fast, straight cross-cuts in wood. A hacksaw trades that reach for a rigid, high-tension frame that cuts metal. Coping and fret saws trade it the other way, for a thin blade that turns tight curves in thin material. Knowing the family makes it easy to reach for the right one.
What sizes do bow saws come in?
Bow saws come in blade lengths from about 15 inches up to 36 inches, with 21, 24, and 30 inches the most common. The 21-inch is the all-round yard size, 24-inch adds stroke for firewood, and 30-inch clears the biggest rounds a hand saw sensibly should.
Folding and camp models start smaller, around 15 to 21 inches, to save pack weight, while a few heavy-duty frames stretch to 36 inches for serious firewood work. Blade length is only half the story: the frame's depth decides how thick a round fits through the bow, so a deep 21-inch saw can out-swallow a shallow one of the same length. Choose the size from the wood you cut most, not the largest frame available.
Why is a bow saw such an economical tool?
Because it separates a cheap, renewable blade from a long-lasting frame, a bow saw is one of the most economical cutting tools you can own. The frame lasts decades, and the only running cost is the occasional replacement blade.
To choose a size and blade, see our best bow saw guide, and to tell it apart from a metal-cutting frame saw, read bow saw vs hacksaw.
