Match line diameter to the horsepower of your trimmer; the larger the line, the more power you need to rotate it. Failure to match may cause overheating, clutch failure, or other mechanical problems. Also note that smaller-diameter lines - .080" and .095" - have higher weld resistance for use with automatic trimmer heads, while larger-diameter lines are more wear-resistant, good where there's a chance of striking solid objects.
Use the following guide:
|Line Diameter||Model Number|
|0.080" to 0.095"||22T, 22F, T195s, F195s, T230, T231, C230 and F230|
|0.095"||T2500, T2510, T260, T261, T270, T272X, C260 and C270|
|0.105" to .130"||T3410X, T350, C350 and B450|
|0.155"||B450 (use only on higher-powered models at the user's discretion)|
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