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Casting Repair Products > Full-Torque Products > Spark Plug Hole Thread Inserts > Spark Plug Thread Repair Kits > Order # FFT514125LOK  
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Order # FFT514125LOK, Spark Plug Thread Repair Kits

Inserts used for cast iron cylinder heads are made of steel for proper heat transfer. Inserts used for aluminum heads are made of aluminum and hard anodized for proper heat transfer and thread strength.

Basic Kit contains: 5 Inserts, Tap, Core Drill, Counterbore Cutter, Drill Tube, Drill Bit, Locking Pins, Tapping Fluid, Thread Locker, Installation Tool Kit and Instructions.

Specifications  · Kit Contents  · Kit Components


Shipping Weight

37.60 oz

Thread Size

14mm x 1.25


18.8 mm


17.8 mm

Piloted Tap



Aluminum Oversized

Core Drill Size

16.3 mm


Discounts applied to multiple packages of inserts
All inserts work with both tapered seat and gasket seal type spark plugs

Kit Contents
5 Inserts

Core Drill

Counterbore Cutter

Drill Bit

Drill Tube

Installation Tool Kit


Locking Pins


Tapping Fluid

Thread Locker

Kit Components

Inserts (Package of 5)

FFT514125LO-5, Spark Plug Thread Repair Kits - Inserts

Install Kit

FT514125T, Installation Tool Kits

Core Drill

FT4164CD, Drill Bits


·  Deep Reach Style

·  Spark Plug Thread Repair Kits - A

·  Spark Plug Thread Repair Kits - B

·  Spark Plug Thread Repair Kits - C