Husqvarna T35 Trimmer Head (578 44 63-01)
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.
In short:The Husqvarna T35 (part 578 44 63-01) is a semi-automatic tap-feed trimmer head for brush cutters, taking line from 2.4 to 2.7 mm. Tapping the head on the ground at full throttle releases more line. The thicker line suits mid-size petrol machines cutting rough grass and weeds. Check that it fits your machine's arbor and that your engine is rated for 2.4–2.7 mm line before buying.
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Pros
- Takes thicker 2.4–2.7 mm line for rough grass
- Simple tap-to-feed operation
- Original Husqvarna part
Cons
- Too much line for small or cordless trimmers
- Third-party seller on Amazon.co.uk in October 2026
What it is
The T35 is Husqvarna’s semi-automatic trimmer head for brush cutters, part number 578 44 63-01, taking line of 2.4–2.7 mm. Like the T25, it feeds line when you tap it on the ground at full throttle, but its bigger spool and thicker line suit machines with more power. When we checked in October 2026 it was in stock from a third-party seller on Amazon.co.uk.
Which machines?
Thicker line needs more engine to keep it spinning at cutting speed, so the T35 suits mid-size petrol brush cutters rather than small trimmers. Check the arbor thread and the line sizes listed in your machine’s manual before ordering. Our line size guide explains how line diameter, engine size and head go together.
Using it well
Wind the spool evenly with line of the right size, and don’t over-fill it — packed spools jam. Soaking nylon line in water before winding helps it stay supple. If line keeps breaking or welding inside the head, see line keeps breaking and line welding together.
Alternatives
Compare heads, including fixed-line and quick-load designs, 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
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
Oregon's boltless tap-and-go universal head (109 mm) for strimmers over 33 cc — takes up to 2.4 mm line, with brass eyelets, supplied with Duoline.
- TypeBoltless tap-and-go (bump feed)
- Diameter109 mm
- LineUp to 2.4 mm, various shapes; supplied with Duoline