Edger Blades, Hedge Trimmers and Power Heads

Edger blade size, thickness and mounting hole

Walk-behind edgers wear out blades, and replacements are listed by dimensions. A common listing is 2 x 8 inches and about 0.120 inch thick, in packs of different sizes. Check the blade's width and length, its thickness and, above all, the mounting hole pattern or center bore against your edger, because a blade that nearly fits will wobble. Heat-hardened steel keeps its edge longer in abrasive soil. If your edger uses a pair, replace them together to keep it balanced.

Battery voltage and power-head compatibility

Battery-powered trimmers are listed by voltage and battery chemistry, usually lithium-ion. Higher voltage generally means more power, and the pack, charger and tool must all belong to the same system. A power head is the motor unit that drives swappable attachments such as a string trimmer, hedge trimmer or edger, so check that the shaft or coupler on the attachment matches the head. For hedge trimmers, blade length decides how much you cut per pass, and weight and balance matter because you hold the tool at arm's length.

Questions about Edger Blades, Hedge Trimmers and Power Heads

How do I know when an edger blade needs replacing?

When the edge is rounded, chipped or visibly shorter, the edger starts tearing grass and skipping along. Blades dull quickly near concrete and gravel. Replace blades in matching sets, with the same width, thickness and mounting holes.

How long should a hedge trimmer blade be?

Longer blades cut more per pass but are heavier and harder to control. Shorter blades suit small shrubs and shaping, while longer ones suit long, straight hedges. Choose a length you can hold level at arm's length for several minutes, and check the tooth spacing for the thickness of stems you cut.

What is the difference between a string trimmer and an edger?

A string trimmer spins a cutting line to cut grass and weeds around obstacles. A lawn edger has a vertical blade, often on wheels, that cuts a clean line along paths and beds. Some trimmers rotate to edge, but a bladed edger gives a sharper, deeper edge.