Oregon Square Line 3.0mm × 155 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.
In short:This Oregon square line is 3.0 mm thick and comes as a 155 m donut spool. Its four sharp edges cut coarse grass and weeds more cleanly than round line, and the listing says the nylon contains aluminium particles to help it shed heat and resist wear. At 3.0 mm it suits larger petrol brush cutters whose heads accept that size; check your head's maximum line diameter first.
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Pros
- Square edges cut coarse grass and weed stems more cleanly than round line
- 3.0 mm is tough enough for overgrown growth
- 155 m spool lasts a long time; donut shape reduces tangling
Cons
- Too thick for most electric and cordless trimmers
- Square line is noisier and can weld in the spool if wound too tightly
- Wears quickly against concrete and stone edging
What it is
A heavy-duty 3.0 mm square strimmer line from Oregon, sold as a 155 m donut spool (1.29 kg according to the listing). The four edges slice through stems as they spin rather than just battering them, and the listing says the nylon is embedded with aluminium particles to help it shed heat and resist fraying. When we checked in October 2026 it was sold by a third-party seller on Amazon.co.uk.
Will it fit your machine?
Check the maximum line diameter for your head — it’s printed on the head, the spool or in the manual. 3.0 mm sits at the top of what most heads accept and needs a petrol engine with the torque to drive it; on a small cordless or electric trimmer it will overload the motor or simply not fit the eyelets. The listing says it fits standard heads used on Husqvarna, Stihl, Shindaiwa, Echo and other brands — the head’s size limit is what matters. Our line size guide explains how to choose.
Getting the most from it
Wind square line evenly and not too tightly, and keep the spool out of direct sun: heat can make thick line weld together on the spool (see line welding together). Soaking a new spool in water for a few hours before winding is a common trick to restore flexibility.
Honest limitations
Square line is noisier than round and wears fast against paving, stone and fence posts, so it suits open grass and weeds better than edging along hard surfaces — for that, round or twisted line lasts longer. Compare profiles in the best brush cutter line.
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