DEWALT String Trimmer Replacement Spool 90599025 — Preloaded Line for DCST920/970/990 Models, OEM Fit

DEWALT 90599025 is a factory OEM replacement string trimmer spool that comes pre-loaded with line to restore cutting performance on compatible DEWALT cordless trimmers.

If your DEWALT 40V or 60V string trimmer is running low on line or the spool has worn, the 90599025 OEM replacement spool offers a quick, tool-free refresh. This genuine DeWalt part is designed to fit multiple DCST920, DCST970, and DCST990 models and arrives ready to install so you can get back to trimming edges and overgrowth without fuss. Using the correct OEM spool helps ensure proper feed and fit within the original trimmer head.

Which DEWALT trimmers work with this replacement spool?

The 90599025 spool is compatible with several DeWalt cordless string trimmer models across 40V and 60V platforms. It fits specific Type variations of DCST920, DCST970, and DCST990 series heads—check your model and type marking to confirm fitment. Installing the correct OEM part maintains the head geometry and line feed intended by DEWALT.

• Fits DCST920B and DCST920P1 Type configurations
• Compatible with DCST970B and DCST970X1 60V trimmers
• Works with DCST990B, DCST990H1, DCST990M1 and DCST990X1 variations
• OEM part number: 90599025—matches factory replacement spec

How easy is it to install the OEM replacement spool?

Installation is straightforward and typically requires no special tools—most users can swap the spool in minutes. The spool comes preloaded with cutting line, so you only remove the trimmer head cap, replace the old spool with this OEM unit, and re-secure the cap. This preserves correct line length and feed behavior for consistent cutting.

• Preloaded spool reduces setup time
• Tool-free head access on most compatible models
• Designed to snap into the original head housing for secure fit
• Maintains manufacturer-specified line feed pattern

What performance differences can I expect using an OEM spool?

Using the DEWALT OEM spool helps restore the trimmer’s designed cutting width and feed reliability. Because the part matches factory specifications, it reduces snagging, uneven feed, and fitment issues that can occur with generic spools. Expect predictable bump-feed action and line retention when the part is properly installed.

• Consistent line feed and reduced jamming
• Proper seating prevents wobble and vibration
• Preserves cutting diameter and balance
• Factory line length for immediate use out of the box

Who is this for: This DEWALT 90599025 replacement spool is intended for owners of compatible DEWALT cordless string trimmers who prefer OEM-quality parts for maintenance and repair. It's ideal for homeowners and pros who want a fast, reliable swap to get their trimmer back to full cutting performance—especially when original-spec fit, feed behavior, and warranty-friendly parts matter. If your trimmer model and type number match one of the supported DCST920, DCST970, or DCST990 variants, this spool provides a direct, factory-approved replacement.

• Includes: (1) 90599025 Replacement Spool with line