BGTOOL 4002 710 2189 Trimmer Head for STIHL FS Series — Polycut 20-3 Replacement

Meet the BGTOOL 4002 710 2189 Trimmer Head, a robust replacement designed to simplify yard work and keep trimming tasks moving smoothly. It features a left-handed M10 x 1.0 thread for compatible STIHL machines and accepts a wide range of line sizes from 2.0 mm to 3.2 mm. Built to be a reliable swap-in, this head aims to reduce downtime and help you maintain a clean, even cut across different terrains.

Smart compatibility for a wide STIHL toolkit

This head is designed to fit a broad selection of STIHL models, including FS44, FS55, FS56, FS70, FS80, FS83, FS85, FS90, 100RX, FS110, FS120, FS130, FS200, FS250, KM55, KM56, KM85, KM90, KM110, KM130, and FS-KM variants. The expanded compatibility means you can keep a single head on hand for multiple machines, reducing clutter and storage needs.

• Trimmer head thread size: M10 x 1.0 mm left-handed
• Fitment: STIHL FS44 FS55 FS56 FS70 FS80 FS83 FS85 FS90 100RX FS110 FS120 FS130 FS200 FS250 KM55 KM56 KM85 KM90 KM110 KM130 + FS-KM
• Line capacity: accepts 2.0 mm to 3.2 mm lines
• Replacement Part Number: 4002 710 2189
• Replaces Stihl POLYCUT 20-3 head

Why this head works in real-world tasks

In daily yard work, you often encounter a mix of light grasses and tougher growth. This BGTOOL head is designed to handle both with a single, versatile line range. Its left-handed thread helps secure the head during operation while allowing easier removal when you need maintenance or a line change. The result can be a steady, uninterrupted trimming rhythm, whether you’re edging along a driveway or tackling dense mid-season growth.

• Versatile line compatibility reduces the need to carry multiple heads
• Left-handed thread helps secure installation and simplify disassembly
• Durable construction supports regular use across varied yard tasks
• Clear part reference simplifies ordering and replacement

Installation and care tips

Always power off the trimmer and allow the head to cool before servicing. Remove the old head, align the new BGTOOL head with the STIHL mounting, and thread on in the correct direction. Feed the line into the head and check for secure fit before use. Regularly inspect the head for signs of wear and replace as needed to maintain performance.