String Trimmer Replacement Parts

Match the part type (spool, line, head, drive shaft, bump knob), model number, and mounting pattern from your trimmer's manual or the label on the tool; check shaft diameter and thread size for attachments and consult compatibility charts provided by the brand

Prewound spools are quickest to install, loose line is cheaper per foot and lets you customize line diameter, and universal heads offer broad compatibility but require confirming shaft size and mount type before purchase

Choose thinner line (0.065–0.080 in) for light grass and edging and thicker line (0.095–0.155 in) for heavy weeds and brush; twisted or serrated lines improve cutting but may increase motor load—match recommended diameters from your trimmer manufacturer

Look for parts made from reinforced plastics or metal for high-wear components, check average ratings and number of reviews, and consider replacement frequency—higher-quality heads and metal drive components often cost more upfront but last longer

Disconnect power or remove the battery, wear gloves and eye protection, follow the manufacturer's installation steps (align splines, secure retaining nuts or clips), and test at low speed before normal use

Keep cutting line tensioned correctly, clean debris from heads and vents after use, inspect and replace worn lines or damaged spools promptly, lubricate metal shafts per the manual, and store the tool dry to prevent corrosion

Individual parts commonly range from under $10 for line and bump knobs to $20–$80 for heads and spools, while metal drive shafts or gearboxes can cost more; set a budget based on whether you need frequent consumables or occasional durable parts