HARFINGTON 40-Pack M6 To M4 Thread Repair Inserts – 8mm Long, 303 Stainless Steel, Self-Tapping Reducing Sleeves For Damaged Threads

About This Product

If you've ever stripped a threaded hole, you know it's a pain.
These HARFINGTON thread repair inserts are the fix.

They convert a damaged M6 hole into a fresh M4 internal thread, meaning you don't have to scrap the part or drill it out oversized.
The external thread is M6 x 1, and the internal thread is M4 x 0.

7.

Each insert is 8mm long and made from 303 stainless steel – tough, corrosion-resistant, and non-magnetic.

They're easy to install: just thread them into the stripped hole using the proper tool, and they bite into the surrounding material, creating a strong, durable new thread.
They have a small groove at the bottom to help with installation.
Once in place, they can be reused and will hold up to repeated fastening and unfastening.

Great for aviation, automotive, machinery, electronics, and even household appliances.

You get 40 pieces in this pack, so you'll have plenty for multiple repairs.

They're a cost-effective way to fix parts that would otherwise be junk.
Just be careful to install them straight and avoid cross-threading.
A smart addition to any workshop or repair kit.