What size string trimmer line should you use?
Thicker line is tougher, but it also asks more from the trimmer and may not feed through the head correctly.
Shop trimmer line by size
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String trimmer sizes: the quick answer
Use the diameter listed for your exact trimmer head and machine. .065–.080 inch is generally for light residential grass, .095 inch for tougher weeds and larger properties, and .105–.130 inch for compatible heavy-duty equipment. Do not move up in size merely because thicker seems better; oversized line can feed poorly and strain the trimmer.
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Diameter changes the workload
| Typical diameter | General use | Tradeoff |
|---|---|---|
| .065–.080 inch | Light grass and smaller battery trimmers | Feeds easily but wears faster in heavy weeds |
| .095 inch | General property work and tougher grass | Good durability when the head and power unit support it |
| .105–.130 inch | Heavier compatible equipment and coarse growth | More rotating mass and not suitable for every head |
These are general categories, not permission to ignore the manual. Husqvarna notes that incorrect line size can cause feeding problems or breakage, and its heads list specific supported diameter ranges. A line that physically fits through an opening can still be wrong for the spool, feed mechanism, or available power.
Round, twisted, or edged?
- Round: durable, predictable, and a safe default for fences, trees, and normal trimming.
- Twisted: designed to reduce air resistance and noise while offering a sharper cutting profile.
- Square or edged: can cut coarse weeds aggressively but may wear faster against hard surfaces.
- Low-noise designs: useful where noise matters, provided the diameter is approved.
Why line keeps breaking
Breakage can come from brittle aged line, hard contact with concrete or wire, incorrect diameter, excessive line length, tight winding, or a damaged eyelet. Clean the head and follow the winding direction before assuming a more expensive line will solve the problem.
For a typical homeowner
If the manual allows both .080 and .095 inch, use .080 for lighter weekly grass and longer battery runtime; choose .095 for fence rows, coarse weeds, and a larger property where durability matters.
ChoiceMeadow’s verdict
The correct manufacturer-approved diameter beats the thickest line on the shelf. Round .095-inch line is a strong general-purpose choice for compatible full-size trimmers; lighter machines often work better with .080 inch.
Sources
- Husqvarna: trimmer-line range and diameters
- Husqvarna: choosing the correct thickness and reloading line
Follow the safety instructions and supported line sizes in the manual for your exact equipment.