ID HQ SERIES COIL [ID AG801] [ID AG812] [DW801] [4 WIRE] [4"] ANGLE GRINDER SPARE PART [Makita Type] - 30130
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HQ-Grade Reliability — Restore Your Angle Grinder to Full Power
The ID HQ Series Field Coil (Part No. 30130) is a precision-engineered angle grinder spare part designed as a direct replacement for Makita-type 4-inch angle grinders, compatible with models ID AG801, ID AG812, and DW801. Built with high-grade copper wire windings and a robust magnetic core, this 4-wire stator coil delivers reliable electromagnetic field generation to restore full mechanical output and extend the working life of your grinder.
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- OEM-Compatible 4-Wire Field Coil: Engineered specifically for Makita-type 4-inch angle grinders including models ID AG801, ID AG812, and DW801, this coil slots in as a direct drop-in replacement with no modifications required, ensuring a fast and accurate repair every time.
- Premium Copper Wire Windings: The coil is wound with high-conductivity copper wire that maximises electrical efficiency, minimising resistive heat loss during operation. This results in stronger electromagnetic field generation and more consistent torque delivery to the armature.
- High-Temperature Resistant Insulation: The wire windings are coated in a Class F or equivalent heat-resistant insulating varnish, protecting against thermal degradation even under prolonged, heavy-duty grinding cycles where internal temperatures can spike significantly.
- Robust Magnetic Core Construction: Laminated silicon steel is used for the magnetic core to reduce eddy current losses and improve electromagnetic flux efficiency, ensuring the coil converts electrical energy to mechanical energy with minimal waste and consistent output power.
- HQ Series Manufacturing Standard (Part No. 30130): Produced under the ID HQ Series quality standard, this coil is manufactured to tight dimensional and electrical tolerances. It is stocked and distributed through Ideal Power Tools, making it a trusted aftermarket spare part for professional tool repair in workshops, service centres, and trade environments.
This spare part is supplied as a single field coil assembly. It is compatible with 4-inch angle grinder models that follow the Makita AG801/AG812/DW801 form factor and wiring configuration.
General Purchase & Comparison Queries
Is this coil compatible with my Makita 4-inch angle grinder?
This ID HQ Series Field Coil (Part No. 30130) is designed as a direct replacement for Makita-type 4-inch angle grinders — specifically models ID AG801, ID AG812, and DW801. If your grinder shares the same form factor and uses a 4-wire stator coil configuration, this part is very likely compatible. If you are unsure, check your grinder's model number or contact us before ordering.
How does this aftermarket coil compare to an original Makita coil?
The ID HQ Series coil is manufactured to OEM-equivalent tolerances, using high-conductivity copper wire windings and heat-resistant insulation. While it is an aftermarket part, it is engineered to match the original specification in terms of winding count, wire gauge, and dimensional fit. For most repair and maintenance applications, it delivers performance on par with the original at a significantly lower cost.
Is it more cost-effective to replace the coil or buy a new grinder?
In most cases, replacing a failed field coil is far more economical than purchasing a new angle grinder. The coil is one of the most common failure points in power tools, and if the rest of the grinder body, gearbox, and armature are in good condition, a coil replacement restores full functionality at a fraction of the cost of a replacement machine. This makes the ID HQ Series coil an ideal solution for workshops and professionals managing tool maintenance budgets.
Product-Specific and Usage Queries
What does a field coil do in an angle grinder?
The field coil (stator coil) is a stationary winding inside the angle grinder motor that generates a rotating electromagnetic field. This field interacts with the armature (rotor) to produce the rotational mechanical force that drives the grinding disc. Without a functioning coil, the motor cannot generate adequate torque, resulting in loss of power, overheating, or complete failure to start.
What does the "4-wire" specification mean for this coil?
The 4-wire designation refers to the number of electrical connection leads on the coil assembly. This is a critical specification when sourcing a replacement, as using a coil with the wrong number of wires or incorrect lead configuration will result in improper electrical connection and potential damage to the tool. Always verify your existing coil's wire count before ordering a replacement.
Can I install this coil myself, or do I need a professional?
Installation of a field coil requires disassembly of the angle grinder motor housing and basic knowledge of power tool electronics. Experienced technicians and repair professionals will find the process straightforward. For those without prior experience in power tool repair, it is recommended to have the installation carried out by a qualified tool repair technician to ensure correct fitment and safe operation.
Problem/Solution-Oriented Queries
My angle grinder has lost power or runs intermittently — is the coil the problem?
Loss of power, intermittent running, or a burning smell are the most common signs of a failing field coil. The coil's wire windings can short-circuit or break down due to excessive heat, wear, or electrical overload. If the armature and brushes have been checked and are in good condition, a faulty stator coil is a primary suspect. Replacing it with the ID HQ Series coil (Part No. 30130) is a cost-effective first step in diagnosing and resolving the issue.
My grinder gets very hot during use — could a degraded coil be causing this?
Yes. A coil with degraded or damaged insulation can cause increased electrical resistance within the windings, which generates excess heat during operation. Over time, this thermal buildup accelerates further insulation breakdown in a cycle that leads to total coil failure. Replacing the coil with one featuring high-temperature resistant insulation — as found in the ID HQ Series — can resolve abnormal heat buildup and restore safe operating temperatures.
How do I confirm the correct part number before purchasing?
To confirm fitment, cross-reference your grinder's model number (AG801, AG812, or DW801) and verify that your existing coil is a 4-wire type for a 4-inch angle grinder. The ID HQ Series coil carries Part No. 30130. If you have the original coil available, you can also match the outer diameter, core length, and lead wire positions. For further assistance, contact the Ideal Power Tools team with your grinder model details before placing your order.