Weed Eater String .155 inches Heavy-Duty Square Trimmer Line 5LB 429 Feet Commercial Weed Wacker String Spool

What It Is

This is a 5-pound spool of .155-inch heavy-duty square trimmer line, designed for commercial-grade weed wackers. The square shape provides sharper cutting edges than round line, and the 429-foot length suits high-volume users who go through line quickly.

Fitment & Compatibility

Before buying, check three things:

1. Line diameter: .155-inch is thicker than standard residential line (typically .080–.105). It fits only trimmer heads rated for .155-inch or larger. Using it in a head meant for thinner line can cause jamming or motor overload.
2. Trimmer head type: Ensure your head accepts bulk spool line (most bump-feed and fixed-line heads do). Pre-wound spool heads won’t work—you’ll need to wind it yourself.
3. Trimmer power: This line is for gas or high-torque electric trimmers (35cc+ gas or 40V+ battery). Low-power electric trimmers may lack torque to cut effectively with this heavy line.

This is an aftermarket product, not OEM for any specific brand. It’s compatible with any trimmer head that accepts .155-inch line.

Key Things to Know

• Durability: The square shape and heavy gauge reduce fraying and snapping in thick weeds and brush. Expect longer life than standard round line, but it’s heavier, so fuel/battery consumption increases slightly.
• Installation: Winding 5 pounds of line by hand is tedious. Use a drill with a line-winding attachment (sold separately) or a manual winder to avoid tangles.
• Common gotcha: .155-inch line may not fit through the eyelets of some trimmer heads designed for thinner line. Check your head’s line slot width—if it’s less than .160 inches, you’ll need to file it larger or swap heads.
• Noise: The thicker line creates more vibration and noise than lighter line. Expect a rougher feel and louder operation.

Should You Buy It

Buy this if you maintain large properties commercially or have a heavy-duty gas trimmer and go through line by the pound each season. It’s overkill for a small yard or a lightweight electric trimmer—stick with .080–.105-inch line for those. The 5-pound spool saves money per foot but requires commitment to winding and a compatible head.