String Trimmer Lines & Spools

Match the line diameter to your trimmer's specifications; lighter-duty consumer trimmers typically use 0.065–0.080 inches, medium-duty use 0.080–0.095 inches, and heavy-duty or brush-cutting trimmers use 0.095 inches and up. Check your trimmer manual or spool label for recommended diameters and do not exceed the maximum to avoid motor strain

Round line is quiet and wears evenly, good for light grass; twisted or multi-sided line offers greater cutting efficiency and longer life for regular use; serrated or scalloped profiles cut more aggressively and handle thicker weeds and light brush but may wear faster on abrasive surfaces

Pre-wound spools save time and reduce installation errors, while bulk line is more economical per foot and lets you cut exact lengths for different spool sizes; choose pre-wound for convenience or bulk if you trim frequently and want lower ongoing cost

Compatibility depends on spool diameter, hub configuration, and feed mechanism; measure your existing spool or consult your trimmer's model number and compare mounting style (bump feed, auto-feed, fixed line). Many aftermarket spools list compatible brands/models or provide universal adapters

Avoid striking hard surfaces like concrete or rocks, store line and spools out of direct sunlight to prevent UV degradation, trim line to recommended lengths to reduce overload, and clean spool housing to prevent debris buildup that can cause jams

Basic single-spool replacements and short packages of line are available under $20, while larger multi-packs or heavy-duty specialty lines typically range from about $20 to $80; average shopper spending per product in this category is moderate, reflecting varied pack sizes and line types

Thicker line generally provides more cutting power and durability against thicker vegetation, but it increases load on the trimmer motor and may not fit all heads; for heavy brush use consider using a dedicated brush-cutting blade or a trimmer rated for heavier line diameters