155 Trimmer Line Heavy Duty Square, 155 Weed Eater String, String Trimmer Line .155, Commercial Weed Trimmer String 155, Weed Wacker String .155inch-288ft-3lb Fits Most String Trimmer(Square)

What It Is

This is a 0.155-inch heavy-duty square trimmer line, sold in a 288-foot, 3-pound spool. It’s designed for commercial-grade or high-use residential trimmers, handling thick weeds, overgrown grass, and light brush without frequent breakage.

Fitment & Compatibility

• Line Diameter: 0.155 inch (3.9 mm). Check your trimmer’s manual or head for the max line diameter—most standard heads accept up to 0.155, but some smaller electric or cordless models cap at 0.095 or 0.105. Using too thick a line can jam or overload the head.
• Brand/Model Fit: This is a universal aftermarket line. It fits any trimmer that accepts 0.155-inch line (e.g., Echo, Stihl, Husqvarna, Ryobi, Craftsman, etc.). It will not work with auto-feed heads that require a specific brand or shape unless your head accepts square line.
• Shape: Square profile gives more cutting edge and durability compared to round. Ensure your trimmer head can load square line—most bump-feed and fixed-line heads can, but some pre-wound spools are brand-specific.
• Spool Type: This is bulk line only—no pre-wound spool. You’ll need to wind it onto your existing spool or use a universal spool. Check if your trimmer head is a “fixed line” (pre-cut lengths) or “bump feed” (continuous feed from a spool); both work, but winding a 288-foot spool takes time.

Key Things to Know

• Quality: Heavy-duty, resists fraying and snapping better than standard round line. Good for rocky or fence-line areas. Not as flexible as 0.130 or smaller line—may be stiff in cold weather.
• Installation: Moderate difficulty. Cutting 288 feet into manageable lengths (e.g., 15-20 feet per load) and winding tightly on the spool is tedious. Use a line winder tool if possible. Overloading the spool can cause jams.
• Common Gotchas:
  • If your trimmer head is designed for 0.130 or 0.095 line, this 0.155 will not fit. Measure your current line or check the head’s internal slot width.
  • Square line can be noisier and more aggressive on thin grass—may scuff turf if used too aggressively.
  • The 3-pound spool is heavy; store in a dry place to avoid moisture damage.

Should You Buy It

Buy this if you have a gas or high-power electric trimmer that accepts 0.155-inch line, and you regularly tackle thick weeds or light brush. It’s a cost-effective bulk option for commercial or heavy residential use, but skip it if your trimmer maxes out at a smaller diameter or you only do light trimming—you’ll waste line and risk damaging the head.