ID HQ SERIES ARMATURE [ID AGH125B | G15SA2] 5" ANGLE GRINDER SPARE PART [Hitachi Type] - 29010
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Restore Peak Performance with a Precision-Engineered Armature Replacement
The ID HQ Series Armature is a precision-engineered replacement armature designed for Hitachi-type 5" (125mm) angle grinders, including the ID AGH125B and G15SA2 models. Manufactured to OEM-type specifications, this high-quality spare part features a laminated magnetic core, precision-wound copper coils, and a machined commutator to restore efficient electrical-to-mechanical energy conversion. It helps recover the grinder's original power, torque, and operating efficiency, making it an ideal replacement for professional repairs, preventive maintenance, and workshop servicing.
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Compatible with Hitachi-Type ID AGH125B & G15SA2 5" Angle Grinders: The ID HQ Series Armature is manufactured as a direct replacement for Hitachi-type ID AGH125B and G15SA2 5-inch (125mm) angle grinders. Designed to match the original electrical and mechanical specifications, it installs into the existing motor assembly to restore reliable performance without requiring modifications.
- High-Grade Magnetic Core for Maximum Torque Output: The armature features a laminated silicon steel magnetic core that minimises eddy current losses and maximises magnetic flux efficiency. This translates directly into stronger torque delivery, consistent RPM under load, and reduced motor temperature during extended use.
- Precision Copper Winding for Efficient Power Transmission: Each armature is wound with high-conductivity copper wire using precise coil geometry to ensure balanced electromagnetic performance. Proper winding tension and insulation prevent short circuits, reduce vibration, and maintain stable current flow from the power source to the rotating shaft.
- Machined Commutator for Reliable Brush Contact: The precision-turned commutator ensures consistent and even contact with the carbon brushes, reducing electrical arcing, brush wear, and heat build-up. A well-machined commutator is critical for smooth motor operation and is a key factor in the longevity of the entire grinder motor assembly.
- CE Machine Test Certified — Built to Safety Standards: 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 armature unit (1 piece), ready for immediate installation by a qualified technician or experienced DIY user.
General Purchase & Comparison Queries
Is this armature compatible with my Hitachi angle grinder?
This ID HQ Series Armature is compatible with Hitachi-type 5-inch (125mm) angle grinders, including ID AGH125B and G15SA2 models. To ensure the correct fit, we recommend verifying your angle grinder model and comparing the existing armature with this replacement before purchasing.
How does the ID HQ Series armature compare to a generic replacement?
The HQ (High Quality) Series armature is built to tighter tolerances than generic alternatives. It features precision copper winding, a machined commutator, and a laminated magnetic core — all of which contribute to better energy efficiency, lower operating temperatures, and a longer service life compared to standard off-the-shelf replacements.
Does this armature come with any certification or quality guarantee?
Yes. This armature is CE (Machine Test) certified, meaning it has been independently tested and verified to comply with European safety and electromagnetic compatibility standards. This certification provides assurance of build quality and safe operation when installed correctly in a compatible tool.
Product-Specific and Usage Queries
What is included in the package?
The package contains one (1) armature unit — the ID AGH125B for Hitachi-type 5" angle grinders. No additional components such as brushes, bearings, or tools are included. If your grinder requires a full motor rebuild, we recommend inspecting and replacing the carbon brushes and field coil at the same time for optimal results.
Can I install this armature myself, or do I need a professional?
Armature replacement requires disassembly of the angle grinder motor housing and basic knowledge of power tool internals. Experienced DIY users with the right tools can complete the installation, but for best results and safety, we recommend having the replacement carried out by a qualified power tool repair technician. Always disconnect the tool from the power supply before beginning any repair work.
How do I know if my armature needs replacing?
Common signs of a failing armature include excessive sparking at the brush contact area, loss of power or inconsistent RPM, unusual heat from the motor housing, burning smell during operation, or the grinder failing to start altogether. If you observe any of these symptoms, inspect the commutator surface and windings for damage, scoring, or burnt insulation before confirming the armature needs replacement.
Problem/Solution-Oriented Queries
My angle grinder has lost power and sparks excessively — will replacing the armature fix this?
Excessive sparking and power loss are among the most common indicators of a worn or damaged armature. A scored or burnt commutator surface disrupts brush contact, causing arcing and reduced electrical efficiency. Replacing the armature with this ID HQ Series Armature restores clean commutator contact, eliminates abnormal sparking, and returns the grinder to its rated power output — provided the field coil and brushes are also in good condition.
The grinder runs but gets very hot quickly — could the armature be the cause?
Yes. A shorted or partially damaged armature winding causes increased resistance and current draw, which generates excess heat in the motor. If your grinder overheats rapidly even under light load, the armature windings may have degraded insulation or internal short circuits. Installing a new precision-wound HQ Series armature with intact insulation resolves this issue and prevents further thermal damage to the motor assembly.
I ordered the wrong armature — how do I confirm the correct part before purchasing?
To confirm compatibility, locate the model number plate on your angle grinder (usually on the motor housing or handle) and cross-reference it with the original part number listed in your tool's service manual or on the existing armature itself. The ID HQ Series Armature is corresponds to Part No. 29010 for Hitachi-type 5" (125mm) angle grinders. If you are unsure, contact us with your grinder's model number and we will confirm compatibility before you order.
Armature (1 Pcs)