ID HQ SERIES COIL [3612] [12MM] ROUTER SPARE PART [Bosch Type] - 30372
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Restore Peak Router Performance with a Factory-Grade HQ Series Coil
The ID HQ Series Coil (Part No. 30372) is a precision-engineered router spare part designed as a direct Bosch-type replacement for the 3612 router with 12mm collet. Constructed with high-grade copper wire windings, premium insulation, and a laminated magnetic core, this field coil converts electrical energy into reliable mechanical power, restoring your router to full operational performance with minimal downtime.
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- Bosch 3612 Router Compatibility (Part No. 30372): Engineered as a direct drop-in replacement for the Bosch-type 3612 router, this coil matches OEM dimensions and electrical specifications precisely — eliminating guesswork during installation and ensuring a secure, reliable fit within the motor housing.
- High-Grade Copper Wire Windings: The coil features tightly wound, high-conductivity copper wire that maximises electromagnetic induction efficiency. This results in consistent torque delivery and reduced power draw, protecting the router's other internal components from excess strain.
- High-Temperature Resistant Insulation: Each winding is encased in heat-resistant insulation rated to withstand the thermal demands of continuous routing applications. This prevents inter-winding short circuits and coil degradation even during prolonged heavy-duty use.
- Laminated Magnetic Core for Reduced Energy Loss: The laminated iron core is designed to minimise eddy current losses, reducing heat generation within the coil assembly. This improves overall motor efficiency and extends the service life of the repaired tool significantly.
- 12mm Collet Size — Precision Mechanical Fitment: Designed specifically for the 12mm collet variant of the Bosch 3612 router, this coil integrates seamlessly with the existing motor assembly. No modifications are required, making it the ideal choice for both professional service technicians and experienced DIY repairers.
- Restores Full Mechanical Output: A faulty or burnt field coil is one of the most common causes of router power loss, overheating, or complete failure. Replacing it with this HQ Series coil restores the electromagnetic field generation necessary for full mechanical energy conversion, bringing the router back to its rated RPM and torque output.
This spare part meets the quality standards expected of the HQ Series product line and is supplied as a single replacement coil unit. It is compatible with the Bosch 3612 router platform and is suitable for use in professional repair and maintenance workflows.
General Purchase & Comparison Queries
Is this coil a genuine OEM part or an aftermarket replacement?
This is an HQ Series aftermarket replacement coil (Part No. 30372) engineered to meet or exceed the original equipment specifications of the Bosch 3612 router. It is manufactured to precise dimensional and electrical tolerances, making it a reliable alternative to OEM parts — often at a significantly lower cost and with faster local availability.
How does this compare to the original Bosch coil for the 3612?
The ID HQ Series Coil (30372) is designed as a direct functional equivalent to the factory Bosch coil. It uses high-conductivity copper windings, heat-resistant insulation, and a laminated magnetic core — the same core construction principles used in original equipment. For repair and maintenance purposes, it delivers equivalent performance at a more accessible price point.
Will this coil fit other Bosch router models besides the 3612?
This coil is specifically rated for the Bosch 3612 router with a 12mm collet. While some Bosch router models share similar internal architectures, we strongly recommend verifying the part number (30372) and motor specifications against your specific model before purchasing. Using an incompatible coil may result in poor performance or damage to the tool.
Product-Specific and Usage Queries
What is the function of a field coil in a router?
The field coil (also called a stator coil) generates the electromagnetic field that drives the router's armature to spin. It converts incoming electrical energy into mechanical energy, directly determining the tool's torque, speed stability, and overall power output. A failed coil typically results in the router losing power, overheating, or failing to start entirely.
Is this coil suitable for heavy-duty continuous routing work?
Yes. The HQ Series Coil (30372) is built with high-temperature resistant insulation designed to withstand the thermal stress of sustained operation. The laminated magnetic core further reduces heat build-up by minimising eddy current losses, making it suitable for professional and trade environments where the router is used for extended periods.
Do I need any special tools to install this replacement coil?
Installation typically requires standard power tool disassembly tools such as Torx or Phillips screwdrivers, a spanner set, and basic electrical knowledge to safely disconnect and reconnect the coil terminals. We recommend this replacement be carried out by a qualified power tool technician or experienced repairer. Always disconnect the tool from the mains supply before beginning any internal repairs.
Problem/Solution-Oriented Queries
My Bosch 3612 router has lost power and overheats — could it be the coil?
Yes, a failing or burnt field coil is one of the most common causes of power loss and overheating in routers. When the coil's insulation degrades or windings short-circuit, the electromagnetic field weakens, reducing torque and causing excessive heat. Replacing the coil with the ID HQ Series Part No. 30372 restores the motor's magnetic field generation and typically resolves these symptoms.
My router starts briefly then cuts out — can a new coil fix this?
Intermittent operation followed by cut-out is a classic symptom of a coil with partial winding damage or a developing insulation fault. As the coil heats up, the fault worsens and the motor cuts out. Installing a new HQ Series replacement coil (30372) eliminates this fault condition, restoring consistent and reliable router operation. It is also advisable to inspect the brushes and armature during the same service.
I ordered the wrong coil previously — how do I confirm this is the right part?
To confirm compatibility, verify the following: your router is a Bosch 3612 model, it uses a 12mm collet, and the replacement part number required is 30372. Cross-reference these details with your router's nameplate or user manual before ordering. If you are unsure, our team can assist you in confirming the correct HQ Series spare part for your specific tool.