C3-2 Trimmer Head Replacement Spool Kit for Stihl Autocut C3-2 FSA 57/FSE 52, 4 Pre-Wound Spools+1 Spring+1 Base Cover, Weed Eater String Trimmer Parts 4009 710 4305 (Fit Serial Numbers 5-XXXX)

What It Is

This is a replacement spool kit for Stihl Autocut C3-2 trimmer heads, designed for battery-powered models like the FSA 57 and FSE 52. It includes 4 pre-wound spools, a spring, and a base cover—ideal for homeowners needing quick reloads without manual winding.

Fitment & Compatibility

• Exact Fit: Only for Stihl Autocut C3-2 heads (part #4009 710 4305). Verify your trimmer’s serial number starts with “5-” (e.g., 5-XXXX). Not for older C3-2 heads with serial numbers starting “4-” or other Autocut models.
• Model Check: Confirmed for FSA 57 and FSE 52. Not for gas-powered trimmers or other Stihl battery models (e.g., FSA 45, FSA 65).
• OEM vs Aftermarket: This is a third-party kit, not Stihl OEM. It matches OEM dimensions but may vary slightly in plastic quality or spring tension.
• Measurement: Spool diameter is ~2.8 inches; line is 0.080-inch (2.0mm) diameter, 13 feet per spool. Measure your existing spool to confirm fit.

Key Things to Know

• Pre-wound spools save time: No winding required—just snap in and trim. Great for quick changes mid-job.
• Spring and cover included: The extra spring is a common wear item; having a spare extends head life. Base cover fits snugly but may need slight trimming if your head is worn.
• Installation: Easy—remove old spool, insert new one, thread line through eyelets, and replace cover. No tools needed. Some users report the spring can be stiff initially.
• Quality variance: 3.9/5 rating suggests occasional defects (e.g., line tangling or spool cracking). Inspect spools before use; return if damaged.

Should You Buy It

If you own an FSA 57 or FSE 52 with a C3-2 head (serial 5-XXXX) and want a low-cost, ready-to-use refill kit, this is a solid value—especially for occasional trimming. Skip it if you need OEM reliability for heavy commercial use or have an older C3-2 head.