Induction Innovations Essential Coil Kit MD99-660, pre-formed plated coils for Mini-Ductor — multiple sizes, flexible fit

The Induction Innovations Essential Coil Kit (MD99-660) is a set of pre-formed, plated induction heater coils engineered to speed, localize, and simplify the release of small seized nuts, bolts, and metallic hardware without an open flame.

This compact kit supplies professionally made replacement coils that pair with Mini-Ductor Series induction heaters to provide rapid, focused heating where torches are impractical or unsafe. Each coil is plated to resist oxidation for reliable electrical contact and is flexible enough to be shaped to tight or awkward spaces. Designed and assembled in the USA using OEM parts, the kit covers a range of diameters and access scenarios so technicians can heat fasteners, corrosion, or thread-lock compounds with minimal disturbance to surrounding components.

Which coil sizes are included and why do they matter?

The MD99-660 Essential Coil Kit includes two 7/8" MD99-601 coils, two 3/4" MD99-611 coils, one 7/8" MD99-605 coil, one 1" MD99-610 coil, and one 7/8" LCK MD99-621 coil. Multiple diameters give you the ability to select the closest-fit coil to the target fastener for efficient energy transfer and faster release times.

• Two 7/8" MD99-601 — common size for medium fasteners and repeated use.
• Two 3/4" MD99-611 — tighter fit around smaller studs and bolts.
• One 7/8" MD99-605 — alternate profile for confined access.
• One 1" MD99-610 — slightly larger diameter for broader coverage.
• One 7/8" LCK MD99-621 — specialized locking coil for difficult angles.

How do these coils improve safety compared with a torch?

Induction coils deliver localized heat without an open flame, drastically reducing combustible risks and accidental damage to nearby components. The focused heating shortens job time and reduces the need to disassemble surrounding parts, lowering both downtime and exposure to hazards.

• No open flame — minimizes fire risk and heat spread.
• Localized heating — protects plastic, rubber, and finishes nearby.
• Faster release — reduces time spent exposed to workplace hazards.
• Flexible coils — reach recessed hardware safely without maneuvering a torch.

Can the coils be reshaped and how long will they last?

These coils are intentionally flexible and can be bent to conform to hard-to-reach geometry, enabling access behind housings or near delicate materials. They are plated to prevent oxidation and tested to withstand several hundred cycles under normal use, though eventual replacement is expected if the insulating coating becomes breached.

• Flexible construction — shapes to fit corners and buried fasteners.
• Plated finish — preserves reliable electrical contact over many uses.
• Replace when insulation or plating is damaged — safety-driven maintenance.
• OEM-built — consistent specifications and quality control.

What tasks and environments are these coils best suited for?

The kit is optimized for service shops, HVAC and automotive repair, industrial maintenance, and any setting where seized or corroded small hardware is common. Use them for freeing rusted bolts, heating threaded assemblies with thread-lock compounds, or targeted heating where open flame is prohibited or impractical.

• Automotive brake and suspension fasteners.
• Electrical or electronic enclosures where flame is unacceptable.
• Field service and plant maintenance for stuck hardware.
• Precision work near plastics, hoses, and seals.

Who is this for? The Induction Innovations Essential Coil Kit is intended for professional technicians, maintenance crews, and experienced DIYers who already use or plan to use Mini-Ductor Series induction heaters. If you need dependable, OEM-quality coils that offer multiple diameters, flexible access, and safer heating without an open flame, this kit supplies the core options to handle routine seized-fastener challenges quickly and repeatedly.