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Home>Helical Thread Inserts>Other>Spark Plug
Spark Plug Thread Repair Kit: 7/8-18, 1/2" & 5/8" Length
Part Number 88013
Spark Plug Thread Repair Kit: 7/8-18, 1/2" & 5/8" Length
Spark Plug Thread Repair Kit: 7/8-18, 1/2" & 5/8" Length
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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: 5/8" L)
  • Installation Tool
Helical Insert Specs:
  • Internal Thread Size: 7/8-18
  • Length: 1/2", 5/8"
  • Material: 18-8 (304) Stainless Steel
  • Type: Free Running
  • Tap Size: 7/8-18 STI
  • Drill Size: 57/64" (not included in kit, sold separately)
Quickly 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 - 7/8-18, 1/2" & 5/8" Length
  • Chrislynn P/N: 88013
  • Helicoil P/N: 550
Available Modifications to our Helical Inserts...
  • 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
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.

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.

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