Introduction
Choosing the correct trimmer line can feel like a puzzle, especially when you own a Dewalt weed eater and see options like .080 and .095 on the shelf. The question “What Size String for Dewalt Weed Eater?” comes up often because the line diameter directly affects cutting performance, line life, and the overall feel of the tool. This guide walks you through everything you need to know — from basic line terminology to model‑specific recommendations, a side‑by‑side comparison, step‑by‑step installation, maintenance tips, and answers to the most common questions. By the end you’ll be able to pick the right size with confidence and keep your trimmer running smoothly all season.
- Introduction
- Understanding Trimmer Line Basics
- Dewalt Weed Eater Compatibility
- .080 vs .095 Line Comparison
- Choosing the Right Size for Your Tasks
- How to Install New Trimmer Line
- Maintenance Tips for Longer Line Life
- Common Mistakes to Avoid
- Frequently Asked Questions
- Conclusion
Understanding Trimmer Line Basics
Diameter vs. Shape
Trimmer line is measured by its diameter, expressed in inches (e.g., .080″ or .095″). The diameter determines how much material the line can cut before it wears down. Thicker line (.095) has more mass, so it retains momentum better and slices through dense weeds, thick grass, and light brush. Thinner line (.080) is lighter, spins faster, and is ideal for fine grass, edging, and delicate landscaping. Shape also matters — round, square, twisted, and star‑shaped profiles each change the cutting edge geometry. Round line is the most common and works well for general use, while square or twisted line adds more cutting edges for tougher vegetation.
Material Types
Most modern trimmer lines are made from nylon copolymers that balance flexibility and abrasion resistance. Some premium lines incorporate a co‑extruded core with a harder outer sheath, giving extra durability without sacrificing flexibility. Dewalt’s own branded lines often use a high‑impact nylon formulation designed to withstand the higher RPMs of their brushless motors. When shopping, look for “high‑strength” or “commercial grade” labels if you plan on heavy‑duty work; standard residential line is sufficient for light yard maintenance.
Dewalt Weed Eater Compatibility
Model Specific Recommendations
Dewalt offers several string trimmer platforms — 20V MAX, 60V MAX, and the newer 18V XR series. Each platform has a recommended line diameter range printed in the owner’s manual. For example, the 20V MAX 13‑inch trimmer (model DCST920) lists .080″ as the standard line but notes that .095″ can be used for heavier growth. The 60V MAX 15‑inch model (DCST970) ships with .095″ line because its higher torque can handle the extra load. Always check the manual for your exact model number; using a line outside the recommended range can cause excessive vibration, premature spool wear, or even motor overload.
Manufacturer Guidelines
Dewalt’s official documentation emphasizes two points: stay within the specified diameter range and use line that meets the “commercial grade” rating for the 60V series. The manual also warns against mixing line types on a dual‑feed spool — both sides should be the same diameter and shape to keep the head balanced. If you’re unsure, the Dewalt website has a line‑selector tool where you enter the model number and it returns the approved diameters. Following these guidelines protects your warranty and ensures optimal cutting performance.
.080 vs .095 Line Comparison
| Feature | .080″ Line | .095″ Line |
|---|---|---|
| Diameter | 0.080 inches | 0.095 inches |
| Typical Cutting Power | Light to medium grass, edging | Thick grass, weeds, light brush |
| Line Life (average) | 30‑45 minutes per spool | 45‑70 minutes per spool |
| Best For | Residential lawns, fine turf | Commercial jobs, overgrown areas |
| Spool Capacity (typical 13″ head) | ~25 ft | ~20 ft |
| Vibration Level | Lower | Higher |
| Motor Load (20V MAX) | Light | Moderate |
Performance Differences
In practice, the .080″ line spins up to speed faster because it has less mass, giving a snappier response when you pull the trigger. This makes it excellent for precise edging along sidewalks and flower beds. The .095″ line, by contrast, maintains momentum through dense patches, reducing the number of times you need to re‑feed line. However, the added mass increases vibration, which can be felt in the handle during extended use. If you have a brushless motor with electronic torque control, the motor will compensate, but you may notice a slight reduction in runtime per battery charge.
Durability and Wear
Thicker line generally lasts longer per foot because each strand has more material to abrade before it breaks. The trade‑off is that the spool holds fewer feet of .095″ line, so you’ll reload more often if you’re cutting a large area. For a typical 13‑inch head, you’ll get roughly 25 ft of .080″ versus 20 ft of .095″. If you’re doing a quick weekly trim, the difference is negligible; for a full‑day commercial job, the longer life of .095″ can save you several spool changes.
Choosing the Right Size for Your Tasks
Light Residential Use
If your yard consists mainly of a manicured lawn, a few flower beds, and occasional edging, .080″ line is usually the sweet spot. It provides clean cuts on fine grass, reduces vibration for a more comfortable experience, and the spool holds enough line for multiple sessions. Pair it with a round or slightly twisted profile for a balance of cutting speed and line life. Many Dewalt 20V MAX owners stick with the factory .080″ line and only upgrade when they encounter a particularly tough patch.
Heavy Duty Commercial Use
Landscapers who tackle overgrown fields, thick weeds, and light brush should lean toward .095″ line, especially on the 60V MAX platform where the motor can deliver the torque needed. A square or star‑shaped .095″ line adds extra cutting edges, making quick work of stubborn growth. Keep a spare spool on the truck — commercial crews often go through a spool every 45‑60 minutes on heavy jobs. The higher vibration can be mitigated with anti‑vibration gloves and a well‑balanced harness. (See Also:What Size Weed Eater String For Dewalt)
How to Install New Trimmer Line
Step 1: Gather Tools
You’ll need a new spool of the correct diameter (check your manual), a pair of scissors or a line cutter, and a clean work surface. Having a small brush to clear debris from the head helps prevent jams later.
Step 2: Remove Old Line
Turn the trimmer off and remove the battery. Press the spool release tabs (usually two side buttons) and pull the spool out. Unwind any remaining line, discarding it. Inspect the spool for cracks or excessive wear; replace the spool if the hub is damaged.
Step 3: Load New Line
Cut a length of line according to the spool’s capacity (typically 20‑25 ft). Insert one end into the anchor hole on the spool hub, then wind the line neatly in the direction indicated by the arrow on the spool. Keep tension even to avoid overlapping loops. When you reach the end, leave about 6 inches protruding, then snap the spool back into the head until the release tabs click.
Step 4: Test the Trimmer
Reattach the battery, hold the trimmer at a safe angle, and squeeze the trigger. The line should feed automatically as it spins. If the line doesn’t advance, turn the tool off, remove the spool, and verify that the line is wound in the correct direction and not tangled. A properly loaded spool will feed smoothly and cut cleanly on the first pass.
Maintenance Tips for Longer Line Life
Keep the Spool Clean
Grass clippings, dirt, and sap can build up inside the head, causing the line to bind. After each use, blow out the head with compressed air or brush it gently. A clean spool feeds line consistently and reduces uneven wear.
Store Properly
When the season ends, remove the spool and store it in a cool, dry place. UV exposure makes nylon brittle over time, so avoid leaving line in direct sunlight. If you keep a spare spool in the garage, place it in a sealed plastic bag to keep moisture out.
Inspect Regularly
Before each job, glance at the line length. If it’s worn down to less than 2 inches, replace it. Running with a stubby line forces the motor to work harder and can damage the head’s feed mechanism. (See Also:How To Use Kobalt Weed Eater)
Common Mistakes to Avoid
One frequent error is mixing diameters on a dual‑feed head — this unbalances the spool and leads to vibration and premature wear. Another is using a line that’s too thick for the motor; the extra load can trigger the electronic protection circuit, causing the trimmer to shut down unexpectedly. Over‑winding the spool (packing line too tightly) prevents proper feed and can jam the head. Finally, neglecting to clean the head after wet cutting lets moisture corrode the internal spring, shortening the life of the feed system.
Frequently Asked Questions
Can I use .095″ line on a 20V MAX Dewalt trimmer?
Yes, many 20V MAX models accept .095″ line, but the manual typically lists .080″ as the standard. Using .095″ will increase cutting power for thick weeds but may reduce runtime and increase vibration. Check your specific model’s manual before switching.
Does line shape matter more than diameter?
Both matter. Diameter sets the baseline cutting capacity, while shape adds cutting edges. For most homeowners, a round .080″ line is sufficient. Professionals often prefer square or twisted .095″ line for the extra bite on tough vegetation.
How often should I replace the trimmer line?
Replace when the line wears to less than 2 inches or when you notice a drop in cutting performance. Heavy commercial use may require a new spool every 45‑60 minutes; light residential use can go several sessions on one spool.
What happens if I use the wrong diameter line?
Using a line thinner than recommended can cause the line to snap frequently and may not feed correctly. Using a line thicker than recommended can overload the motor, increase vibration, and void the warranty. (See Also:How To Dispose Of Old Weed Eater)
Is Dewalt branded line worth the extra cost?
Dewalt line is engineered for their motor RPM and feed system, offering consistent feed and durability. Generic commercial‑grade line of the same diameter and shape often performs similarly, but Dewalt line guarantees compatibility and is a safe choice for warranty protection.
Conclusion
Selecting the right trimmer line for your Dewalt weed eater comes down to matching the line diameter to the work you do and the specific model you own. For most homeowners, .080″ round line delivers a smooth, low‑vibration experience perfect for weekly lawn care. If you regularly face thick weeds, overgrown fields, or light brush — especially with a 60V MAX unit — stepping up to .095″ square or twisted line gives you the cutting power and longevity you need. Always consult your owner’s manual, follow the installation steps carefully, and keep the spool clean to maximize line life. With the correct line installed, your Dewalt trimmer will stay ready to tackle any yard challenge season after season.