ID HQ SERIES ARMATURE [9557NB] ANGLE GRINDER SPARE PART [Makita Type] - 29005
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Restore Peak Performance with a Precision-Engineered Replacement Armature
The ID HQ Series Armature for the 9557NB Angle Grinder (Part No. 29005) is a precision-engineered power tool spare part designed as a direct Makita-type replacement armature. Built with a high-grade magnetic core, precision-wound copper windings, and a machined commutator, this armature efficiently converts electrical energy into mechanical rotation, restoring your angle grinder to full operational performance with minimal downtime.
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- Makita 9557NB-Compatible Direct Fit: Engineered to match the exact dimensions and electrical specifications of the original Makita 9557NB angle grinder armature, this drop-in replacement spare part eliminates the need for modifications or adapters — simply install and resume work with confidence.
- High-Efficiency Magnetic Core Construction: The armature features a laminated magnetic core that minimises eddy current losses, ensuring maximum energy conversion from electrical input to rotational mechanical output. This translates to consistent RPM delivery and reduced motor heat during extended use.
- Precision Copper Winding for Thermal Stability: Each armature is wound with high-conductivity copper wire using tight, uniform coil spacing. This precision winding reduces resistance, lowers operating temperature, and extends the service life of the motor — critical for heavy-duty grinding and cutting applications.
- Machined Commutator for Reliable Brush Contact: The precision-turned commutator ensures consistent and even contact with the carbon brushes, reducing arcing, sparking, and brush wear. This results in smoother motor operation and a longer overall lifespan for both the armature and the brushes.
- CE Machine Test Certified — Safety You Can Trust: This armature carries CE (Machine Test) certification, confirming it has been independently tested and verified to meet European safety and electromagnetic compatibility standards. It is supplied as a single unit (1 piece) and is ready for immediate installation by a qualified technician.
General Purchase & Comparison Queries
Is this armature compatible with my Makita 9557NB angle grinder?
Yes. This armature (Part No. 29005) is specifically engineered as a Makita-type replacement for the 9557NB angle grinder. It matches the original electrical and dimensional specifications, making it a direct-fit spare part. Always verify your model number before ordering to ensure compatibility.
How does this compare to an original Makita OEM armature?
This is an aftermarket replacement armature manufactured to match the performance and fit of the original Makita OEM part. It uses a high-grade magnetic core and precision copper windings, and carries CE Machine Test certification — offering a cost-effective alternative without compromising on safety or functionality for most repair and maintenance applications.
What is included in the package?
The package includes one (1) armature unit ready for installation. It is CE Machine Test certified and supplied as a standalone spare part. No additional accessories or tools are included. Installation should be carried out by a qualified power tool technician.
Product-Specific and Usage Queries
What does an armature do in an angle grinder?
The armature is the rotating core of the electric motor inside your angle grinder. It consists of a laminated magnetic core, copper windings, and a commutator. Together, these components convert electrical energy into the rotational mechanical energy that drives the grinding disc. A faulty armature typically causes the tool to lose power, overheat, or stop working entirely.
Can I install this armature myself?
While the armature is a direct-fit replacement that does not require modifications, disassembling and reassembling an angle grinder motor requires specific tools and technical knowledge. We strongly recommend having the armature installed by a qualified power tool repair technician to ensure correct fitment, safe operation, and to avoid damage to surrounding components such as the carbon brushes or field coil.
What certifications does this armature carry?
This armature is certified to CE (Machine Test) standards, which verifies that it has been independently tested for safety and compliance with European machinery directives. This certification ensures the part meets the required electromagnetic compatibility and mechanical safety benchmarks for use in power tools.
Problem/Solution-Oriented Queries
My angle grinder has stopped working or lost power — could it be the armature?
Yes, a failed or burnt-out armature is one of the most common causes of an angle grinder losing power or stopping completely. Signs of a faulty armature include excessive sparking from the brush area, a burning smell, unusual vibration, or the motor running but the disc not spinning. Replacing the armature with this HQ Series 9557NB-type unit is a cost-effective repair that can restore your tool to full working condition.
Will a new armature fix overheating issues in my grinder?
Overheating can be caused by a damaged or shorted armature winding, which increases electrical resistance and generates excess heat. Replacing the armature with this precision copper-wound replacement can resolve overheating caused by winding failure. However, overheating may also result from blocked ventilation, worn brushes, or a faulty field coil — it is advisable to have a technician perform a full motor inspection before and after replacement.
How do I know when it's time to replace the armature rather than the whole tool?
Replacing the armature spare part is the recommended approach when the tool body, gearbox, and housing are still in good condition and the fault is isolated to the motor. Given that a quality replacement armature costs significantly less than a new angle grinder, it is a practical and economical repair — especially for professional-grade tools used in workshops and on job sites. If multiple components are failing simultaneously, a full tool replacement may be more cost-effective.
Armature (1 Pcs)