The 40-4 trimmer head is a four line string head for grass cutters and brush cutters. The white top plate carries six mounting holes, the black base holds the spool, and four lines come out in four directions. The head bolts to the gearbox through the six holes, so match the old head's hole count, spacing and thread before replacing. Four lines cut a wider pass, and one broken line leaves three still working, which suits thick grass and weedy ground. After fitting, cut the four lines to the same length, and replace the head when the line exits wear loose or the plate is dented.

 FAQ 

Q1: What are the six holes on the top plate for?

They are the mounting holes. The head bolts onto the gearbox through them, so the hole count and spacing must match your old head before you order.

Q2: How is a four line head different from a two line head?

Four lines give a wider cut per revolution and keep working on three lines if one breaks. The trade is faster line use, so reline a little more often.

Q3: How do I check this head will fit my cutter?

Compare the old head's hole pattern and the gearbox thread, or send a photo of the old head and we will confirm before you buy.