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.