A source-backed fitment desk
Start with the model, fitted head, and market. We show the maker’s published line limits, then keep unknown combinations blank until there is a source for them.
Nominal conversions use 25.4 mm per inch. Manufacturer limits decide fit.
Model → head → published spec
We will only show a size when a manufacturer source identifies the selected model/head combination.
Reverse lookup
Search a manufacturer part number to see the exact tool models, heads, and markets listed in our verified part records.
Enter the complete manufacturer number and choose the market where the tool was sold.
Enter a printed diameter in inches or millimeters. This converts units; it cannot identify an unmarked line or prove fit.
Conversion is mathematical only. Trimmer line may have manufacturing tolerances and non-round profiles; use the package/manual spec for fit.
Answer what you observe. The checklist separates setup checks from compatibility questions; it does not diagnose a fault.
Stop the tool and follow its manual before inspecting. Do not test a thicker size to find out.
Choose the closest symptom. These general checks are not a diagnosis; the exact model/head manual takes precedence.
Stop the tool and follow the exact manual’s shutdown steps before opening or handling the head. Feed systems differ; this general checklist does not identify a compatible line or part.
What changes the answer
A brand-wide chart can blend machines with different spools and limits. Match the exact label and manual edition for your market.
One tool family may accept multiple attachments. The fitted head can narrow the line shape, diameter, and loading method.
Owners report considering thicker line after repeated breakage. A larger diameter can exceed the manufacturer limit or increase load. Find the cause safely before changing line.
US and Canadian listings, SKU suffixes, and manuals may diverge. If your tag or manual conflicts with this index, follow the exact applicable manual and report the mismatch.
Field notes
Keep going
Questions owners ask
Use the size specified for your exact trimmer model and installed head. The same diameter is not approved for every machine. Start with the lookup above, then confirm against the manual linked in the result.
Not necessarily. Thick line can exceed a tool’s published limit and increase motor or head load. Breakage at hard surfaces is different from line failing inside the head. Check the manual and follow the troubleshooting steps before changing diameter.
Model names, SKU suffixes, attachments, and manuals can vary by market and production revision. This preview only displays records for the selected market where we found an applicable official source. Follow the manual supplied for your serial/model variant if it differs.
Loading puts fresh line into the spool or head. Feeding, advancing, or releasing line changes how much line extends during use. Names such as LOAD N’ GO or POWERLOAD do not tell you every step or behavior across models; confirm the exact installed head and manual. Read the loading and feed-system guide ↗
Read the package first. If you are measuring loose line, use a suitable caliper at several points and treat the result as approximate, especially for twisted or shaped profiles. Do not assume color corresponds to diameter.
No. Each record names the exact model and a head description supported by its cited source. If your installed head does not match the record, do not apply the displayed specification to it.
Only use cutting materials explicitly approved by the manual for your model and head. Some manuals prohibit metal and reinforced line. This index is for documented nylon line options and will not recommend wire.
Method & source notes
Published limits below come from manufacturer manuals or model-specific product support pages. Model-index entries show the region and source type; check your manual's revision and serial applicability before acting. Latest records were checked on October 20, 2026. Each record carries its own check date; older sources may have been checked earlier.
Independent research prototype, not affiliated with STIHL, Husqvarna, EGO, or Greenworks. Safety and compatibility decisions belong to the product's applicable manual. No equipment is guaranteed compatible by brand name alone.