THTEN DWZSTH999 Replacement Head Compatible with Dewalt DCST972,DCST922,DCST925,DCST920,DCST970 Cordless String Trimmer with 0.080" 20ft Trimmer Spool Line

What It Is

This is a replacement trimmer head assembly designed for DEWALT cordless string trimmers, specifically the 20V MAX models DCST972, DCST922, DCST925, DCST920, and DCST970. It uses a 0.080-inch diameter trimmer line on a 20-foot spool, intended for residential trimming of grass and light weeds.

Fitment & Compatibility

Before buying, confirm your trimmer model number exactly (e.g., DCST972B, DCST922P1). This head is an aftermarket replacement, not OEM DEWALT, so fitment may vary slightly. It only works with these five specific models—do not assume it fits other DEWALT trimmers, especially gas or 60V versions. Check that your trimmer uses a standard bump-feed head and that the mounting shaft diameter matches (typically 1-inch on these models). No deck size applies here.

Key Things to Know

• Quality concerns: With a 3.4/5 rating from only 28 reviews, expect possible durability issues—some users report the head cracking or the spool not feeding line reliably after a few uses.
• Installation difficulty: Easy to install if you’re comfortable removing the old head (usually unscrews by hand or with a pin wrench). No special tools needed, but check that the included adapter fits your trimmer’s drive shaft.
• Line loading: The 0.080-inch line is thinner than OEM (often 0.095"), so it cuts lighter vegetation but may break more easily. The 20-foot spool is short—plan to reload frequently.
• Bump-feed mechanism: Works like the original, but some users report inconsistent line release. Tap firmly on the ground to advance line.

Should You Buy It

Buy this only if you need a budget-friendly quick fix for a broken head on one of the listed DEWALT trimmers and don’t mind potential quality trade-offs. For reliable long-term use, consider OEM DEWALT replacement heads (N488421 or N489699) which cost more but have better reviews and durability.