Overview
This aftermarket spool set replaces the Craftsman CMZST080 / CMZST0803 trimmer spool for the CMCST910, CMCST930, and CMCST915 series string trimmers. Each spool is factory pre-wound with 20 feet of 0.080-inch twist line, which is thicker and more durable than the 0.065” variant and better suited for heavier trimming jobs. The precision winding reduces the tangling and overlap issues common with hand-wound spools.
Key specifications
- Line diameter: 0.080 inch (twist profile)
- Line length: 20 feet per spool
- Replaces OEM parts: CMZST080, CMZST0803 (Item #1143441)
- Cap and spring part: CMZST120SC
Compatibility
Fits Craftsman V20 cordless string trimmers and edgers including CMCST910M1, CMCST910B, CMCST930P1, CMCST930, CMCST915C1, CMCST915D1, and the CMCK497P1 combo kit. The 0.080” twist line matches the factory trimmer head geometry for these models. Verify your trimmer accepts the CMZST080 spool before ordering.
Installation notes
Press the tabs on the spool cap to release it, remove the worn spool, and drop the new pre-wound spool onto the hub. Seat the spring beneath and snap the cap back into place. Pull the line ends through the eyelets, following the directional arrow stamped on the trimmer head. The 0.080” twist profile grips dense weeds better than round line — let the trimmer reach full speed before engaging thick growth for the cleanest cuts.
Common questions
Q: Will the CMZST0803 spool fit my Craftsman CMCST930 and the trimmer from the CMCK497P1 combo kit?
Yes, this replacement spool is made for Craftsman CMCST910, CMCST930, and CMCST915 series trimmers, and it also matches the CMZST080 0.080 in. spool used with the CMCK497P1 20V cordless string trimmer combo kit. The main thing to verify is that your trimmer is designed for 0.080-inch line and uses the CMZST080-style spool.
Q: How do I install the CMZST0803 replacement spool on a Craftsman CMCST915 without the line tangling?
Remove the battery first, then open the spool cap, take out the old spool, and clean any grass or debris from the housing before dropping in the new spool. Make sure the line ends are routed through the eyelets correctly and that the spool turns freely before snapping the cap back on, which helps prevent binding and uneven feeding.
Q: Is the line on this CMZST0803 spool durable enough for edging, or is it only for light trimming?
The 0.080-inch line is a good all-around size for routine grass trimming and edging around sidewalks, fences, and beds on compatible Craftsman trimmers. For best results, avoid using it like a brush-cutting line on thick woody stems, and replace the spool once the line gets too short to feed consistently.
