KTHA 1040-03 Weed Eater Head Replacement Compatible with Kobalt 80V KST 1680-06 40V KST 2540-06 KST 1040A-03 24V KST 224A-03 KST 224B-03 Cordless String Trimmer with 0.080" 17 Ft Pre-Cut Dual Line

What It Is

This is a replacement trimmer head for Kobalt cordless string trimmers, designed to hold two pre-cut 0.080-inch lines (17 feet total) for bump-feed line advancement. It’s a direct-fit aftermarket part for several Kobalt 80V, 40V, and 24V models.

Fitment & Compatibility

Check your trimmer’s model number against this list: works with Kobalt 80V KST 1680-06, 40V KST 2540-06 and KST 1040A-03, and 24V KST 224A-03 and KST 224B-03. Do not assume fitment for other Kobalt trimmers—measure the shaft diameter (should be 0.5 inches) and confirm the head mounting hole pattern. This is an aftermarket part, not OEM Kobalt, so slight manufacturing variances may affect fit on older or newer revisions of these models.

Key Things to Know

• Line loading is pre-cut only – The head accepts two 0.080-inch lines at 17 feet total (8.5 ft per side). You cannot use larger line (e.g., 0.095 or 0.105) without rewinding or modifying the head.
• Installation is straightforward – Remove the old head by unscrewing it (typically counterclockwise), then screw this one on. No tools required, but hand-tighten firmly to avoid wobble.
• Common complaint: line breaks easily – Several users report the pre-cut lines snap more often than OEM heads. You can replace them with aftermarket 0.080 line, but the bump-feed mechanism may not advance consistently.
• Lower than average rating – 3.2 stars from 19 reviews suggests reliability issues. If you need a quick, cheap fix, it works; for long-term use, OEM or a higher-rated aftermarket head may be better.

Should You Buy It

Buy this if you need a budget-friendly, direct-fit replacement for a Kobalt trimmer listed above and you’re comfortable with potentially shorter line life and occasional feed issues. Skip it if you want OEM durability or plan to use thicker line—look for a Kobalt genuine head instead.