The best brush cutter line
The right line makes grass cutting cleaner, faster and cheaper. Here are the trimmer lines we rate — from aggressive square profiles to great-value big spools — and how to pick the thickness.
In short:The right trimmer line depends on your head and the job. Light electric and cordless trimmers usually take 1.6–2.0 mm round line, such as Silverline's 2.0 mm 377 m spool. Petrol brush cutters take 2.4–3.0 mm: Husqvarna Titanium Force and Oregon Duoline (2.4 mm, dual-material) last well; square and star profiles such as Oregon's 3.0 mm cut coarse grass more cleanly; round line is quieter and more durable against walls. Use the thickness your head is designed for.
The 15 we cover
Husqvarna's premium Titanium Force line in 2.4 mm (0.095 in) on an 840 ft (about 256 m) spool, made in the USA — designed for long life and lower noise.
- Diameter2.4 mm (0.095 in)
- Length840 ft (≈256 m)
- Made inUSA
A 1.65 mm six-point star-profile trimmer line that cuts more cleanly than round line — for light, regular lawn trimming on smaller trimmers.
- Diameter1.65 mm (0.065 in)
- ProfileSix-point star
- Length40 ft (≈12 m) or 220 ft (≈67 m) packs
Oregon's 2.4 mm round dual-material line on a 90 m donut spool — anti-weld surface, carbon-loaded core, claimed up to 30% more durable than standard round line.
- Diameter2.4 mm
- ProfileRound
- ConstructionAnti-weld surface, carbon-loaded core
A huge 377 m spool of 2.0 mm round co-polymer line from Silverline — the lowest cost per metre for years of everyday trimming.
- Diameter2.0 mm
- ProfileRound
- Length377 m
A 3.0 mm square-profile strimmer line on a 155 m donut spool, with four cutting edges and aluminium particles in the nylon — for larger petrol machines.
- Diameter3.0 mm
- ProfileSquare, four cutting edges
- Length155 m (donut spool)
A 2.7 mm five-edge trimmer line with a wire core for break resistance, on a 100 m spool — for mid-size petrol trimmers on rough grass and weeds.
- Diameter2.7 mm (also 2.0, 2.4, 3.0 mm)
- ProfileFive-edged
- CoreWire-reinforced (listing)
Oregon's 2.7 mm round dual-material line on a 140 m spool — anti-weld surface and carbon-loaded core for mid-size and larger petrol trimmers on coarse grass.
- Diameter2.7 mm
- ProfileRound
- ConstructionAnti-weld surface, carbon-loaded core
Oregon's 2.4 mm star-profile line with five cutting edges, on a big 332 m donut spool — clean, neat cutting for mid-size trimmers on grass and weeds.
- Diameter2.4 mm
- ProfileStar, five cutting edges
- Length332 m (donut spool)
Oregon's 3.0 mm round strimmer line on a 169 m donut spool — tough, versatile and quiet-running, for larger petrol brush cutters on long grass.
- Diameter3.0 mm
- ProfileRound
- Length169 m (donut spool)
Akuoly's 2.4 mm trimmer line with a steel-wire core and nylon jacket, 60 m on a storage spool with a compartment — for dense weeds; not a drop-in head spool.
- Diameter2.4 mm (0.095 in)
- Length60 m
- ConstructionNylon jacket over steel-wire core
A 1.6 mm round orange nylon trimmer line on a big 200 m spool — for small electric and battery trimmers doing lawn edging and light grass.
- Diameter1.6 mm (0.065 in)
- ProfileRound
- Length200 m
Makita's E-02705 round nylon line, 2.0 mm × 15 m — a short, cheap refill for small and mid-size electric and battery trimmers on lawns and edges.
- Diameter2.0 mm
- ProfileRound
- Length15 m
Heavy 4.0 mm round trimmer line for the most powerful petrol brush cutters — when it suits, what it needs from your machine, and what to check before buying.
- Diameter4.0 mm
- ProfileRound
- NeedsHead rated for 4.0 mm, powerful petrol engine
Ratioparts Alu-Cut 2.7 mm trimmer line with a six-edged (hexagonal) profile, 15 m in orange — a short refill for mid-size petrol trimmers on coarse grass.
- Diameter2.7 mm (0.105 in)
- ProfileHexagonal (six-point)
- Length15 m
Oregon's 3.0 mm five-edged star line on a 212 m spool — clean, aggressive cutting of tough grass and weeds on powerful petrol brush cutters.
- Diameter3.0 mm
- ProfileStar, five cutting edges
- Length212 m (donut spool)
Thickness matters most
Match the line diameter to your growth: 1.65 mm for light lawn edging, 2.0 mm as the all-round default, and 2.4 mm for thick, tough grass. Going thicker than your head allows just causes jams — check your machine's maximum first.
Profile: square vs round
Square and star profiles have sharp edges that cut cleaner and bite harder on tough grass. Round line feeds smoothly and costs less, ideal for everyday lawn work. If you cut a lot of tough grass, a square 2.0 mm line is the sweet spot; for casual lawns, a big round spool is unbeatable value. See our buying guide for more.
Frequently asked questions
What thickness of trimmer line do I need?
1.5–1.6 mm for light lawn edging, 2.0 mm as an all-round choice, and 2.4 mm+ for thick or tough grass. Always check your machine's maximum line diameter first.
Is square line better than round?
Square (and star) profiles have sharp edges that cut cleaner and more aggressively than round line, especially on tough grass. Round line is smoother-feeding and usually cheaper.
Why does my line keep breaking?
Usually the line is too thin for the growth, worn/brittle from age, or you're hitting hard edges. Step up a thickness, store line out of sunlight, and keep clear of walls and stones.
Does trimmer line fit any machine?
Line is largely universal by diameter, but your cutting head has a maximum diameter it accepts. Match the line thickness to the head, not the brand.
Which one for which need
Attacking tough grass
Thick line resists wear and cuts tough vegetation. In exchange it demands more torque from the machine.
Finishing cleanly
Fine line cuts soft grass more cleanly and puts less strain on the machine, at the cost of breaking more often.
Lasting a whole season
Line is a brushcutter's main consumable. The spool length decides how many refills you get before buying again.
Who each type suits
- Edges and finishing
- Fine line is enough and does less damage to whatever borders the area. It is the most frequent use of a lightweight machine.
- Scrub and tall grass
- Thick line holds where fine line burns through in a few minutes. The machine has to have the matching torque.
- Working near trunks
- Line damages the bark of young trees with every pass. It is a frequent cause of dieback, and invisible at the time.
The trade-offs to weigh
- Thickness against available torque
- Line too thick for the machine makes it labour and overheat. The maximum permitted diameter is stated by the manufacturer, and it is not exceeded.
- Serrated profile against longevity
- Twisted or serrated profiles cut better and wear faster. Round line lasts longer and cuts less cleanly.
- Reinforced line against price
- Composite-core lines resist breakage markedly better and cost more. On ground that breaks a lot of line, they work out cheaper.
Questions buyers ask
Why does the line weld to itself inside the head?
The heat of friction melts the coils together, especially on line that has been stored a long time. Soaking the spool in water for a few hours before use markedly reduces the phenomenon.
Should line be stored in water?
Nylon dries out and becomes brittle in storage. A soak of a few hours before use gives it back part of its suppleness.
How much line should I wind on?
Not beyond the spool's mark: an overfilled spool prevents the mechanism feeding correctly.
Does it have to be wound in a particular direction?
The direction is shown on the spool by an arrow. Wound the wrong way, the line will not feed when you tap.
Does line damage trees?
It notches the bark with every pass and can kill a young tree in a season. A trunk protector or a strip of grass left around it prevents that.
Should I cut the line to the length of the guard's cutter?
The guard's cutter sets the length automatically on the first revolution. Line longer than intended slows the machine and causes vibration.
Can the line throw objects?
At that speed it throws gravel, glass fragments and pieces of metal a long way. That is why the area is cleared before starting.
What to remember
Stored line dries out and breaks: a soak of a few hours before use gives it back its suppleness and stops it welding inside the head. Do not exceed the spool's mark or the machine's maximum diameter — and line notches the bark of young trees with every pass.