DEWALT OEM 90599025 String Trimmer Replacement Spool - Line Included DCST920B DCST920P1 DCST920P1 DCST990B DCST990H1 DCST990M1

What It Is

This is the official DEWALT OEM replacement spool pre-wound with trimmer line, designed for use with DEWALT 20V MAX and 60V MAX string trimmers in residential and commercial trimming tasks.

Fitment & Compatibility

• Compatible models: DCST920B, DCST920P1, DCST990B, DCST990H1, DCST990M1. Only these models; does not fit other DEWALT trimmers or cross-brand units.
• Line diameter: 0.080-inch (pre-loaded). If you prefer thicker line, you must rewind the spool yourself (max 0.095-inch).
• Spool type: Bump-feed. Ensure your trimmer head is the bump-feed style (most DEWALT models listed are).
• Check before buying: Verify your trimmer model number on the unit’s label. Measure the existing spool diameter (approx. 2.5 inches) and line thickness. OEM part 90599025 ensures correct fit; aftermarket spools may not lock in properly.

Key Things to Know

• Quality: Pre-wound with DEWALT’s own line, which is durable and resists fraying better than cheap generic line. The spool is molded precisely to the head, reducing jams.
• Installation: Tool-free—pop off the trimmer head cover, remove the old spool, drop in the new one, and thread the line through the eyelets. Takes under 2 minutes.
• Gotcha: The line is 0.080-inch, which is fine for light-to-medium weeds but may break on heavy brush. If you need thicker line, you must manually rewind (the spool accepts up to 0.095-inch).
• Price: At $34.80 (as of this writing), it’s a premium over generic spools. However, the fit and reliability often save you from head replacement later.

Should You Buy It

If you own one of the listed DEWALT trimmers and want a hassle-free, guaranteed-fit replacement that won’t jam or snap prematurely, this OEM spool is worth the cost. It’s ideal for homeowners or pros who value time over saving a few dollars on generic spools that may not feed correctly.