| Our most popular kits for Spark Plug thread repair!
The kit includes:
- HSS STI Plug Tap
- Helical Inserts - 12 pcs. (6: 1/2" L, 6: 3/4" L)
- Installation Tool
Helical Insert Specs:
and easily restore stripped or damaged spark plug port threads to
original dimensions with our Helical Screw Thread Inserts. Spark Plug
Inserts are the preferred method of repair by nearly all US &
foreign auto manufacturers. Coil tension securely holds the insert in
place without undue tension on the surrounding material. The inserts
are vibration and impact resistant so won't strip or seize. Made from
corrosion resistant stainless steel, they offer a wide temperature
tolerance.Helical Inserts are often known by the brand names Helicoil or Recoil Screw Thread Inserts. Our Precision Thread Helical Inserts are interchangeable with other brands of inserts and tooling. If you are currently using Helicoil or Recoil part numbers for your inserts, please see our Cross Reference Numbers below for an easy and accurate transition to our Precision Thread Helical Inserts from Chrislynn.Cross Reference: Spark Plug Thread Repair Kit - M12 x 1.25, 1/2" & 3/4" Length
- Internal Thread Size: M12 x 1.25
- Length: 1/2", 3/4"
- Material: 18-8 (304) Stainless Steel
- Type: Free Running
- Tap Size: M12 x 1.25 STI
- Drill Size: 31/64" (not included in kit, sold separately)
Available Modifications to our Helical Inserts...
- Chrislynn P/N: 88003
- Helicoil P/N: 5523-12
- Recoil P/N: 38120-2
Our Precision Thread Helical Inserts meet or exceed most applicable specifications, including: MS 122076 series, 124651 series, 21208, 21209, 33537, Mil-1-8846, and Mil-F-5577.
- Material - Inconel X750, Phosphor-Bronze, Nitronic 60, 316 Stainless Steel
- Coatings - Dry Film, Cadmium, Silver Plating
- Please call for quote & lead time when requiring any modifications
In need of a different size? Looking for additional inserts?
For a comprehensive list of our available kits, inserts, and tools - please visit our Helical Thread Insert summary page.