Chainsaw Wrenches and Files

Buying guide

Wrenches and files for the saw kit

A combination wrench, often called a scrench, handles bar nuts and the spark plug, with a screwdriver tip for chain tension. Some crews call it an arbor wrench or bar wrench. Pick the size that matches your saw's bar nuts.

Round files must match the cutter size of your chain, commonly 5/32, 11/64, 3/16 or 7/32 inch. Use a file guide for consistent angles, file from the inside of the cutter out, and keep strokes even on both sides. Buying by the dozen is cheaper, and a dull file makes a dull chain.

Sharpening routine

A consistent routine beats a perfect one done once a week. Clamp the bar in a stump vise or log, set your file guide on the chain, count strokes per tooth, and work all the cutters on one side before switching. Check the depth gauges every few sharpenings with a gauge tool and a flat file.

Files are consumables. A file that skates over the tooth instead of biting is dull, and keeps going dull faster as you push harder. Buying files by the dozen keeps a fresh one in every saw kit. Clean the bar groove and check the sprocket while you sharpen, since you already have the saw on your knee.