Aluminium Trimmer Head
What aluminium trimmer heads offer over plastic ones, and what to check before buying one — thread, line size and machine power.
In short:Aluminium trimmer heads are made of metal rather than nylon, so they resist wear from stones and kerbs and last longer on hard-working petrol brush cutters. Most are fixed-line (you insert cut lengths of line) or bump-feed designs. They're heavier than plastic heads, which loads the gearbox and clutch, so they suit powerful machines. Check the arbor thread, adaptors and line size before buying. We couldn't read the current Amazon.co.uk listing on our link in October 2026.
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Pros
- Metal body shrugs off stones and kerbs
- Long life on hard-working machines
- Fixed-line designs never jam
Cons
- Heavier than plastic — more load on the gearbox
- Not for small or cordless trimmers
- Listing details couldn't be checked in October 2026
Why aluminium?
Plastic heads wear fast when they’re dragged along kerbs, walls and stony ground, and their eyelets cut through. An aluminium head is far tougher. Many are fixed-line: you push pre-cut lengths of thick line through the head instead of winding a spool, so there’s nothing to jam. Others are bump-feed designs with metal bodies.
What to check
We couldn’t read the Amazon.co.uk listing on our link in October 2026, so check these points before buying any aluminium head:
- Thread and adaptors — most European petrol brush cutters use M10 × 1.25 left-hand; make sure an adaptor matches yours.
- Line size — aluminium heads usually take thick line (2.4–4 mm); your engine must be rated for it (line size guide).
- Weight — a metal head is heavier, which loads the clutch and gearbox; it suits powerful petrol machines, not small or cordless trimmers.
Using a fixed-line head
Cut lengths of line, push them through the head so the ends are equal, and lock them in. When they wear short, stop the engine and fit new lengths. Use the guard specified for line heads.
Compare
Branded alternatives include the Oregon Lightning Load Pro 130 mm (up to 4 mm line). All head types are compared in the best brush cutter heads.
More heads we cover
A cheap pattern bump-feed head replacing the Echo Speed-Feed 400 on the SRM-210, SRM-225 and SRM-230 — tap-to-feed, no special tools.
- TypeBump feed (tap to release line)
- ReplacesEcho Speed-Feed 400
- Listed forEcho SRM-210, SRM-225, SRM-230
Husqvarna's T25 tap-and-go trimmer head with a 10 mm left-hand thread — the standard head on many Husqvarna straight-shaft trimmers.
- TypeTap-and-go (bump feed), twin line
- Arbor10 mm, left-hand thread
- ShaftStraight-shaft machines
Husqvarna's T35 semi-automatic (tap) trimmer head for 2.4–2.7 mm line — a tougher head for mid-size petrol brush cutters on rough grass.
- TypeSemi-automatic (tap) head
- Line size2.4–2.7 mm
- Part number578 44 63-01
A twin-line tap-feed trimmer head with an M10 × 1.25 left-hand thread, pre-loaded with 4 m of 2.4 mm line and cutting up to 30 cm — for petrol brush cutters.
- TypeTwin-line tap (bump) feed head
- ThreadM10 × 1.25 left-hand
- Line supplied4 m of 2.4 mm, pre-loaded