Helicoil M8 x 1.25 Thread Repair Kit — 12 Inserts with Tap & Installation Tool, Carded Pack

This kit bundles the essential components to repair worn or damaged tapped holes in machinery, automotive parts, and industrial assemblies. Designed for users who need a reliable thread restoration solution without sourcing individual parts, the package arrives carded and includes step-by-step instructions so you can complete repairs quickly and consistently.

What comes in the M8 x 1.25 repair kit?

The kit supplies everything required to cut a new thread and install a stainless-style wire insert sized for M8 x 1.25 threads. Parts are selected to match the Helicoil standard process and are packaged for single-kit convenience.

• 12 pre-sized Helicoil wire-thread inserts for M8 x 1.25
• A dedicated tap sized to prepare the hole for the insert
• An installation tool to seat the insert to the correct depth
• Printed installation instructions included in the carded pack

How do I use the kit to repair a stripped hole?

Follow the included instructions: drill or ream (if required), tap the hole with the supplied tap, and then screw in the wire insert using the installation tool until it seats flush. The process restores a standard M8 x 1.25 thread without needing custom machining.

• Inspect and prepare the hole (clean and remove debris)
• Use the supplied tap to recut the threads to the correct profile
• Install the insert with the tool, then break or remove the tang per instructions
• Verify fit with an M8 x 1.25 bolt before final assembly

What materials and performance should I expect?

Heli-Coil inserts are made from high-quality, wear-resistant material chosen to provide consistent thread engagement and long life under normal mechanical loads. The kit’s tap and installer are sized specifically for the inserts to ensure clean cuts and correct seating.

• Inserts resist galling and provide uniform thread contact
• Tap matches insert geometry for proper fit-up
• Suitable for many metals and common repair scenarios
• Carded packaging protects components and keeps instructions accessible

Will this kit work for my application?

If your damaged fastener opening originally used an M8 x 1.25 coarse thread, this kit is engineered to restore that common size without altering mating hardware. It is intended for mechanical, automotive, and light industrial uses; evaluate the operating environment and load to ensure wire-thread inserts meet your requirements.

• Designed for standard M8 x 1.25 (coarse) threads
• Ideal for stripped bolt holes in engine blocks, housings, and brackets
• Not for specialized high-temperature or high-corrosion environments unless matching material specifications
• Check bolt length and material compatibility before installation

Who is this for: The Heli-Coil 5546-8 kit is aimed at mechanics, maintenance technicians, fabricators, and DIY enthusiasts who need a compact, all-in-one solution to repair stripped M8 x 1.25 threads. It suits workshops and field crews who value repeatable results, straightforward instructions, and the convenience of a single, carded package that contains inserts, a tap, and the required installation tool.