Bosch Professional 0601372201 Review

Sanding is the foundation of every good finish. Whether you are preparing bare timber for varnish, smoothing filler on a plasterboard wall, stripping old paint from a window frame, or refining a lacquered surface between coats, the quality of your sanding directly determines the quality of your final result. Hand-sanding has its place for small touch-ups and delicate corners, but for anything larger than a drawer front, it is slow, uneven, and hard on your hands. A random orbital sander changes the equation entirely. By combining rotary sanding with an eccentric orbital motion, these tools remove material quickly while leaving behind a swirl-free surface that is ready for finishing. Modern cordless models have added a new layer of freedom: no power cord snagging on the edge of your workpiece, no hunting for a socket in a room with the power turned off, and the ability to sand anywhere — from the workshop bench to a ladder on a renovation site.

Choosing a random orbital sander comes down to a few essential factors. Pad diameter — typically 125 mm for general-purpose work — determines how much surface you cover per pass and which sanding discs you can use. Motor type and speed matter significantly: brushless motors run more efficiently, last longer, and maintain consistent speed under load, which means the sander does not bog down when you bear down on a stubborn patch of old paint. Variable speed control lets you match the oscillation rate to the task — high speed for rapid stock removal with coarse grits, lower speed for fine finishing between coats of lacquer. Dust management is not just about keeping your workspace clean; it directly affects sanding performance, as clogged abrasive discs cut slower and leave uneven scratches. A good dust extraction system — whether a built-in collection bag or compatibility with a shop vacuum — keeps the disc clean and your lungs protected. Battery platform compatibility is the final piece: investing in a professional cordless system means your sander shares batteries with your drill, impact driver, circular saw, and everything else in the range.

In this review we examine the Bosch Professional GEX 18V-125, a cordless 125 mm random orbital sander from the brand's blue Professional line. We assess its sanding speed and surface finish quality, dust extraction effectiveness, battery life on the 18V platform, ergonomics during extended use, and how it stacks up against the competition — helping you decide whether this best-selling sander belongs in your tool collection.

The Bosch Professional GEX 18V-125 is powered by a brushless motor running on the Bosch Professional 18-volt battery system — the same platform that drives the brand's drills, impact drivers, saws, and grinders. The motor spins the 125 mm sanding pad at up to 14,000 oscillations per minute in a random orbital pattern, which means the pad rotates as it orbits, producing the signature swirl-free finish that random orbital sanders are known for. Speed is adjustable via a preset dial, letting you dial it down for fine finishing between coats of lacquer or crank it up for aggressive material removal when stripping old varnish or levelling filler. The brushless design, paired with Bosch's COOLPACK battery technology that dissipates heat outward from the cells, translates to longer runtime per charge and extended overall tool life — important considerations for a tool that often runs continuously for extended periods.

Ergonomics are where the GEX 18V-125 truly distinguishes itself. Bosch has positioned the balance point unusually close to the sanding surface — the centre of gravity sits low and near the pad — which means the machine feels planted and stable on the workpiece rather than top-heavy and tippy. The hand rest and main handle are sculpted for a natural, comfortable grip that reduces wrist strain during long sanding sessions. Weighing just 1.09 kg without a battery, it is one of the lighter cordless sanders in its class, and the compact dimensions of 22.4 × 15.3 × 10.8 cm make it easy to manoeuvre on vertical surfaces and overhead without arm fatigue. The 125 mm hook-and-loop sanding pad accepts standard 125 mm discs with eight-hole dust extraction patterns, and pad changes are tool-free — just peel off the old disc and press on the new one.

In use, the GEX 18V-125 delivers exactly what you would expect from a Bosch Professional tool: smooth, controlled, and predictable. The random orbital motion leaves a clean surface free of the circular swirl marks that a purely rotary sander would produce, making it suitable for final finishing before paint, varnish, or oil application. The sander tracks steadily across flat surfaces without the grab-and-jump behaviour that cheaper sanders exhibit when they catch an edge, and the low centre of gravity keeps the pad flat against the workpiece — no tipping and gouging the corner of the pad into your timber. It handles the full spectrum of common sanding materials: solid wood, veneered panels, painted and varnished surfaces, filler and putty, and even mineral and acrylic materials like Corian. The variable speed dial is easily accessible and provides meaningful control across the range.

Dust extraction is a strength of the GEX 18V-125. The sander includes a microfilter dust collection box that captures a significant portion of the fine dust generated during sanding — not all of it, as no bag-based system achieves 100% capture, but enough to keep your work area noticeably cleaner than sanding without extraction. For professional use or extended indoor sanding, the sander is compatible with the Bosch Click & Clean dust extraction system, which connects directly to Bosch dust extractors for near-total dust capture at the source. The eight-hole sanding disc pattern aligns with the pad's dust channels for efficient extraction, and the included C430 Expert for Wood + Paint sanding disc in 120 grit gives you a quality abrasive to start with right out of the box.

The GEX 18V-125 ships as a bare unit with a 125 mm sanding plate, one C430 Expert sanding disc in 120 grit, a microfilter dust box, and a cardboard storage box. Battery and charger are not included, which is standard for professional-grade bare tools — the assumption is that you are already invested in the Bosch Professional 18V ecosystem. The tool holds an impressive 4.6 out of 5 stars rating from 917 customer reviews on Amazon.fr and ranks as the 26th best-selling random orbital sander in the DIY & Tools category — a strong endorsement from a large user base that includes professional carpenters, painters, kitchen fitters, and serious DIYers. Bosch backs the tool with a 24-month manufacturer warranty.

This cordless orbital sander is built for professional carpenters, kitchen fitters, painters, and serious DIY woodworkers who need a lightweight, well-balanced sander that delivers swirl-free results on timber, painted surfaces, filler, and composite materials — all without a power cord.