The most powerful clearing saw in the AP Battery System, the FSA 400 K is built for heavy-duty applications with compatibility for brush knives and circular saw blades.
The FSA 400 K is purpose-built for clearing thick vegetation and small-diameter trees. As the most powerful clearing saw in the AP Battery System—with performance comparable to the gas-powered FS 361 C-EM—it’s designed to take on demanding jobs in forestry, municipal, and landscape applications. Compatible with STIHL brush knives and circular saw blades, this short-shaft unit excels in dense, tough growth where precision and power matter. And with comfort-focused features like an ergonomic control handle and anti-vibration system, it delivers pro-level performance without compromising user experience.
- Power Source: Battery
- Weight: 15.2 lbs.
- Weight (W/ Ap 500 S): 19.6 lbs.
- Run Time (W/ Ap 500 S) Up To: 50 min.
- Cutting Width: 20.5 in.
- Battery System: AP System
- Most Powerful Battery-Powered Clearing Saw in the STIHL Lineup - With power comparable to the gas-powered FS 361 C-EM trimmer, the FSA 400/400 K is the most powerful battery clearing saw in the STIHL lineup and offers users the professional performance they need to take on tough jobs.
- Built for Brush and Blade Cutting - Compatible with professional-grade brush knives and circular saw blades for forestry and land-clearing work.
- Shaft Length - The FSA 400 K features a short shaft and compatibility with a range of heads and blades making it ideal for forestry work and clearing tougher growth.
- Anti-Vibration System - The trimmer features handlebar support with anti-vibration system to help reduce operator fatigue.
- Ergonomic Control Handle - This trimmer offers convenience and maneuverability with all controls located on the ergonomic control handle.
- High-Tech Polymer Housing - Housings are lightweight, withstand greater impact, and are corrosion-resistant.
- Start/Run/Stop Controls on Handle - Convenient start/run/stop controls are built into the handle for easy operation.
- STIHL Electric Motor - Lightweight and compact, STIHL electric motors require minimal maintenance and feature low noise levels and reduced vibration.
- Hanging Loop - Hang your cordless trimmer securely on a wall to save space using the loop in the handle housing
- Retaining Latch - All STIHL battery-powered products feature a retaining latch that is designed to prevent the unit from unintentional starts when the battery is inserted.
- Rubberized Soft-Touch Handle - Soft rubber texture is both easy to grip and makes the product comfortable to hold for extended periods.
- IPX4 Rating - This tool is IPX4-rated for weather-resistant construction and has been designed and tested for splash-water protection.
WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand, and follow carefully the operating and safety instructions in your instruction manual before using such products.
Additional information
| ENGINE | Engine Type Battery |
|---|---|
| GENERAL | Cutting Width 20.5 in. |





