Spark Plug Inserts | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size

M14

M18

	Thread Pitch Thread Pitch

1.25 mm

1.5 mm

	Thread Type Thread Type	Show

Spark Plug

	Thread Type Thread Type	Hide

	For Spark Plug Reach For Spark Plug Reach

	Threaded Insert Type Threaded Insert Type


Thread Locking	Helical

	Number of Inserts Included Number of Inserts Included

	Material Material

Stainless Steel

Steel

	Thread Direction Thread Direction

	Right Hand

	Thread Spacing Thread Spacing

Fine

Extra Fine

	For Use In For Use In

Metal

	For Tap Type For Tap Type

Standard (UN)

Helical

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	End Type End Type

Open

	Tensile Strength Tensile Strength

60,000 to 99,999 psi

100,000 psi or greater

	Passivation Passivation

Not Passivated

	Helical Insert Style Helical Insert Style

With Prong

	For Tap Thread Size For Tap Thread Size

3/4"-16

	Installed Length Installed Length

0.25" to 0.499"

	Drill Bit Size Drill Bit Size

11/16"

	External Locking Type External Locking Type

Thread Locker

	For Maximum Hole Diameter For Maximum Hole Diameter

0.5" to 0.749"

	Thread Fit Thread Fit

Class 6H

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6 Products

Black-Phosphate Steel Easy-to-Install Thread-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Also known as E-Z Lok, these inserts use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. Installation requires a drill bit and a standard tap. Then set the insert with a bolt and two nuts, or use an installation bit.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

For technical drawings and 3-D models, click on a part number.

Metric

			For Tap
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.
Black-Phosphate Steel with Thick Wall
M14	1.25	Extra Fine	3/4"-16	21/64"	11/16"	11/16"	5	000000000	00000
M14	1.25	Extra Fine	3/4"-16	29/64"	11/16"	11/16"	5	000000000	0000

Spark Plug Thread Repair Kits

Kits include helical inserts, a tap, and an installation tool. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert. All have a prong for ease of installation. An installation tool grips the prong and reduces the coil diameter, enabling the insert to fit in tapped holes. Remove the prong to insert the screw.

18-8 Stainless Steel
Includes	No. of Inserts Included		Each
M14×1.25 mm Thread × 3/8" Insert Reach (6 Each) M14×1.25 mm Thread × 7/16" Insert Reach (6 Each) M14×1.25 mm Thread × 0.472" Insert Reach (6 Each) M14×1.25 mm Thread × 1/2" Insert Reach (6 Each) M14×1.25 mm Thread × 3/4" Insert Reach (6 Each) Through-Hole Tap Installation Tool	30	000000000	0000000
M18×1.5 mm Thread × 1/2" Insert Reach (24 Each) Through-Hole Tap Installation Tool	24	000000000	000000

Spark Plug Thread Repair Kits for Gasket-Seat and Taper-Seat Ports

These kits have short-, normal-, and long-reach inserts, an installation tool, and a tap.

18-8 Stainless Steel
Includes	No. of Inserts Included		Each
M14×1.25 mm Thread × Short Insert Reach (1 Each) M14×1.25 mm Thread × Normal Insert Reach (1 Each) M14×1.25 mm Thread × Long Insert Reach (1 Each) Through-Hole Tap Installation Tool	3	000000000	000000
M14×1.25 mm Thread × Short Insert Reach (6 Each) M14×1.25 mm Thread × Normal Insert Reach (6 Each) M14×1.25 mm Thread × Long Insert Reach (6 Each) Through-Hole Tap Installation Tool	18	000000000	000000