ID HQ SERIES ARMATURE [ID AG6-100] [GSW6-100] [4"] ANGLE GRINDER SPARE PART [Hitachi Type] - 29011

This armature (Part No. 29011) is specifically designed for Bosch-type 4-inch angle grinders, including the AG6-100 and GSW6-100 models. It is part of the ID HQ Series and is engineered as a direct-fit replacement, meaning no modifications are needed for installation. Always verify your grinder's model number before purchasing to ensure compatibility.

Replacing the armature is significantly more cost-effective than purchasing a new grinder, especially for professional-grade tools. The armature is the primary component responsible for motor failure in angle grinders, and a quality replacement like the ID HQ Series Armature restores the tool to full performance at a fraction of the cost of a new unit. This makes it the preferred choice for workshops and repair technicians managing tool fleets.

Yes. This armature carries CE Machine Test certification, which confirms it has been tested and evaluated for electrical safety, mechanical integrity, and electromagnetic compatibility in accordance with European standards. This makes it suitable for use in professional and regulated work environments where certified spare parts are required.

The armature is the rotating core of the angle grinder's electric motor. It consists of a laminated magnetic core, copper windings, and a commutator. When electrical current flows through the windings, it interacts with the stator's magnetic field to generate rotational force, which drives the grinder's disc. A damaged or worn armature results in loss of power, overheating, sparking, or complete motor failure.

Common signs of a failing armature include excessive sparking from the brush area, loss of power or inconsistent RPM, unusual motor noise or vibration, overheating during normal use, and the grinder failing to start. If carbon brush replacement does not resolve these issues, the armature is typically the next component to inspect and replace. A multimeter can be used to test winding continuity and identify short circuits or open circuits in the armature coils.

This listing includes one (1) armature. It is sold as a single unit, making it ideal for targeted repairs where only the armature needs replacement. If you are servicing multiple tools or maintaining a spare parts inventory, multiple units can be ordered accordingly.

Heavy sparking in an angle grinder is often caused by a worn or damaged commutator on the armature, or by short-circuited windings. If you have already replaced the carbon brushes and sparking persists, the armature is the most likely cause. Replacing it with the ID HQ Series Armature (Part No. 29011) — which features a precision-machined, hardened commutator — should resolve the issue and restore normal operation for AG6-100 and GSW6-100 models.

Loss of power and reduced RPM in an angle grinder are classic symptoms of a failing armature, particularly when the copper windings have developed internal short circuits or open circuits due to heat damage or wear. After ruling out carbon brush wear and power supply issues, replacing the armature is the recommended next step. The ID HQ Series Armature restores full power transmission efficiency through its high-conductivity copper winding design.

This armature is designed to fit Bosch-type 4-inch angle grinders following the AG6-100 / GSW6-100 form factor. Many compatible and clone-brand grinders use the same internal dimensions and shaft specifications as the original Bosch design. However, we recommend verifying the shaft diameter, overall armature length, and commutator diameter against your existing armature before installation to confirm fitment. When in doubt, contact us with your grinder's model details for confirmation.