M14 Inserts | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size	Show

M14

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

1.25 mm

1.5 mm

2 mm

	Thread Type Thread Type

Metric

	Threaded Insert Type Threaded Insert Type


Key Locking	Helical

Thread Locking

	For Spark Plug Reach For Spark Plug Reach

	Number of Inserts Included Number of Inserts Included

	Material Material

Plastic

Stainless Steel

Steel

	For Use In For Use In

Metal

	For Tap Thread Size For Tap Thread Size

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Thread Direction Thread Direction

	Right Hand

	Installed Length Installed Length

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	For Thread Direction For Thread Direction

Right Hand

Left Hand

	For System of Measurement For System of Measurement

Inch

Metric

	For Tap Type For Tap Type

Standard (UN)

Helical

Metric

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Tensile Strength Tensile Strength

50,000 to 99,999 psi

160,000 psi or greater

Not Rated

	End Type End Type

Open

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	For Drive Style For Drive Style

	Slotted

	For Threaded Insert Type For Threaded Insert Type

47 Products

About Nuts, Materials, and Finishes

How to Install Key-Locking Inserts

How to Install Helical Inserts

About Helical Insert Length

Made of stainless steel, these inserts have good corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. Inserts may be mildly magnetic. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.

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

Inserts
			For Tap							Each		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		1-9	10-Up		Each
18-8 Stainless Steel with Thick Wall
M14	2	Coarse	7/8"-14	__	0.81"	53/64"	0.828"	4	000000000	000000	000000	000000000	000000
M14	2	Coarse	M20	1.5	20mm	18.75 mm	18.75mm	4	000000000	00000	00000	000000000	00000
M14	1.5	Fine	M20	1.5	20mm	18.75 mm	18.75mm	4	000000000	00000	00000	000000000	00000

Black-Phosphate Steel Key-Locking Inserts

A black-phosphate finish provides mild corrosion resistance. Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. Use them to repair or change threads in soft metals such as aluminum. They’re comparable to Keensert® inserts. Installation requires a drill bit, a standard tap, an installation tool, and a hammer.

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

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

Metric

Inserts
			For Tap							Each		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys		1-9	10-Up		Each
Black-Phosphate Steel with Thick Wall
M14	2	Coarse	7/8"-14	__	0.81"	53/64"	53/64"	4	000000000	00000	00000	000000000	000000
M14	2	Coarse	M20	1.5	20mm	18.75 mm	18.75mm	4	000000000	00000	00000	000000000	00000
M14	1.5	Fine	M20	1.5	20mm	18.75 mm	18.75mm	4	000000000	00000	00000	000000000	00000

Key-Locking Inserts with Installation Tool

Drive the keys into the surrounding material for a more secure hold than thread-locking inserts. These inserts are used to repair or convert threads in soft metals such as aluminum. They’re comparable to Keensert® inserts.

18-8 stainless steel inserts are more corrosion resistant than black-phosphate steel. They may be mildly magnetic.

Black-phosphate steel inserts are mildly corrosion resistant.

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	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	No. of Locking Keys	No. of Inserts Included		Each
18-8 Stainless Steel with Thick Wall
M14	2	Coarse	M20	1.5	20mm	18.75 mm	18.75mm	4	4	000000000	0000000
M14	1.5	Fine	M20	1.5	20mm	18.75 mm	18.75mm	4	4	000000000	000000
Black-Phosphate Steel with Thick Wall
M14	2	Coarse	7/8"-14	__	0.81"	53/64"	53/64"	4	3	000000000	00000
M14	2	Coarse	M20	1.5	20mm	18.75 mm	18.75mm	4	4	000000000	00000
M14	1.5	Fine	M20	1.5	20mm	18.75 mm	18.75mm	4	4	000000000	00000

Stainless Steel Helical Inserts

Also known as Heli-Coil inserts, these inserts 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. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

Inserts that meet DIN 8140 adhere to international standards for dimensions.

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

Metric

Inserts										Through-Hole Taps		Closed-End Hole Taps		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Specifications Met	Pkg. Qty.		Pkg.		Each		Each		Each
18-8 Stainless Steel—Right-Hand Threaded
M14	2	Coarse	14	14.5 mm	14.5mm	DIN 8140, SAE MA3279-116	5	000000000	000000	000000000	000000	000000000	0000000	000000000	0000000
M14	2	Coarse	21	14.5 mm	14.5mm	DIN 8140, SAE MA3279-166	1	000000000	0000	000000000	00000	000000000	000000	000000000	000000
M14	1.5	Fine	21	37/64"	37/64"	SAE MA3279-165	5	000000000	00000	000000000	00000	000000000	00000	000000000	000000

Stainless Steel Screw-Locking Helical Inserts

A distorted thread grips the screw to resist loosening. Also known as Heli-Coil inserts, these inserts 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. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

Inserts that meet DIN 8140 adhere to international standards for dimensions.

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

Metric

Inserts										Through-Hole Taps		Closed-End Hole Taps		Installation Tools
Thread Size	Thread Pitch, mm	Thread Spacing	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Specifications Met	Pkg. Qty.		Pkg.		Each		Each		Each
18-8 Stainless Steel
M14	2	Coarse	14	14.5 mm	14.5mm	SAE MA3329-116	1	000000000	00000	000000000	000000	000000000	0000000	000000000	0000000
M14	2	Coarse	21	14.5 mm	14.5mm	DIN 8140, SAE MA3329-166	1	000000000	0000	000000000	00000	000000000	000000	000000000	000000
M14	1.5	Fine	21	37/64"	37/64"	DIN 8140, SAE MA3329-165	1	000000000	0000	000000000	00000	000000000	00000	000000000	000000

Helical Inserts with Installation Tools

Shown with Five Inserts and Drill Bit

Inserts come with a through-hole tap and 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.

Metric

18-8 Stainless Steel—Right-Hand Threaded
Thread Size	Thread Pitch, mm	Thread Spacing	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	No. of Inserts Included	Includes		Each
M14	1.5	Fine	21	9/16"	9/16"	5	Drill Bit, Through-Hole Tap, Installation Tool	000000000	0000000
M14	2	Coarse	21	37/64"	37/64"	12	Drill Bit, Through-Hole Tap, Installation Tool	000000000	000000

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

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	00000

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.

To drive slotted inserts, you can use a slotted screwdriver instead of using an installation bit or a bolt and two nuts.

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

Metric

Installation Bit

Inserts
			For Tap									Installation Bits
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Drive Style	Pkg. Qty.		Pkg.		Each
Black-Phosphate Steel with Thick Wall
M14	2	Coarse	7/8"-9	__	11/16"	49/64"	49/64"	Slotted	5	000000000	000000	000000000	000000
M14	1.25	Extra Fine	3/4"-16	__	21/64"	11/16"	11/16"	__	5	000000000	0000	000000	00
M14	1.25	Extra Fine	3/4"-16	__	29/64"	11/16"	11/16"	__	5	000000000	0000	000000	00
M14	1.25	Extra Fine	3/4"-16	__	45/64"	11/16"	11/16"	__	1	000000000	0000	000000	00
M14	1.25	Extra Fine	M18	1.5	11.5mm	16.5 mm	16.5mm	__	1	000000000	0000	000000	00

18-8 Stainless Steel Easy-to-Install Thread-Locking Inserts

Made of 18-8 stainless steel, these inserts have good corrosion resistance. Also known as E-Z Lok, they use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. They may be mildly magnetic. Installation requires a drill bit and a standard tap. Then set the insert with an installation bit, a slotted screwdriver, or a bolt with two nuts.

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

Installation Bit

Inserts
			For Tap								Installation Bits
Thread Size	Thread Pitch, mm	Thread Spacing	Thread Size	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Drive Style	Pkg. Qty.		Pkg.		Each
18-8 Stainless Steel with Thick Wall
M14	2	Coarse	7/8"-9	11/16"	49/64"	49/64"	Slotted	1	000000000	00000	000000000	000000

Metric Steel Hex Weld Nuts

You can weld these nuts to flat and uneven uncoated steel surfaces for a strong permanent hold. A collar pilot assists alignment and prevents welding spatter from getting into threads.

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

Thread				Collar
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Ht., mm	For Hole Dia., mm	Specifications Met	Pkg. Qty.		Pkg.
Steel
M14	2	22	9.2	16.8	1.8	16.8	DIN 929	10	000000000	00000

Stainless Steel Socket Nuts

These nuts are chemical resistant and may be mildly magnetic. Also known as Allen nuts, use them with socket head cap screws in recessed holes and tight spaces that don't have enough clearance for a wrench. Tighten them with a 6-point hex key. They can also be used as an insert by pressing or drawing them into nonhardened steel, cast iron, or soft nonferrous metal or by molding them into plastic, ceramic, fiber, and similar materials.

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

18-8 Stainless Steel
Thread Size	Thread Pitch	OD	Ht.	Threading	Thread Dp.	For Hole Dia.	Hex Key Size		Each
M14	2mm	20mm	21.3mm	Partially Threaded	11.4mm	21.1mm	1/2"	000000000	000000

Alloy Steel Socket Nuts

Also known as Allen nuts, use these with socket head cap screws in recessed holes and tight spaces that don't have enough clearance for a wrench. Tighten them with a 6-point hex key. They can also be used as an insert by pressing or drawing them into nonhardened steel, cast iron, or soft nonferrous metal or by molding them into plastic, ceramic, fiber, and similar materials. Made from alloy steel, they're comparable in strength to Grade 9 bolts.

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

Alloy Steel
Thread Size	Thread Pitch	OD	Ht.	Threading	Thread Dp.	For Hole Dia.	Hex Key Size		Each
M14	2 mm	20mm	24mm	Partially Threaded	11.4mm	21.1mm	1/2"	000000000	000000

Installation Tools for Key-Locking Inserts

Place the tip of these tools into an insert and strike them with a hammer to drive the keys into the material. They’re compatible with Keensert® inserts.

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

Metric

For Thick-Wall Inserts
For Thread Size	For Tap Thread Size		Each
M14	7/8"-14	000000000	000000
M14	M20	000000000	00000

Heavy Duty Installation Tools for Key-Locking Inserts

With Spring

Install Keensert®-style inserts.

Tools that feature a spring have a knurled grip on that lets you screw inserts into tapped holes, reducing hand fatigue if you’re installing many of them. To fit over inserts evenly, tools have an inner plug and outer ring that align with keys. Strike tools with a hammer to drive keys. The spring along the shaft returns the striking end to its original position to generate more force.

Choose tools that match your insert’s thread size and tap thread size.

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

Metric

For Thick-Wall Inserts
For Thread Size	For Tap Thread Size	Features		Each
M14	M20	Spring	000000000	000000

Installation Bits for Slotted-Drive Inserts

Installation Bit

For fast installation, use these installation bits with power drills and drill presses.

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

For Thread Size	Hex Shank Size		Each
1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, M14	3/8"	000000000	000000

Installation Tools for Helical Inserts

Screw an insert onto these tools and drive them a quarter to half-turn below the material’s surface. They’re compatible with helical inserts that have a prong.

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

Metric

For Thread
Size	Pitch, mm	Style		Each
For Right-Hand Thread
M14	1.5	J	000000000	0000000
M14	2	J	000000000	000000

Extraction Tools for Helical Inserts

Place the tip of these tools into an insert and strike a light blow to the tool’s head. Then turn the tools counterclockwise with pressure to extract the insert.

For Thread Size		Each
7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 1/2"-28, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 5/8"-24, 3/4"-10, 3/4"-16, 3/4"-20, 7/8"-9, 7/8"-14, 7/8"-20, 1"-8, 1"-12, 1"-14, M12, M14, M16, M18, M20, M22, M24	000000000	000000

Threaded Round Plugs for Straight-Thread Pipe

Seal tube and hose fittings to keep their straight threads protected from contaminants during fabrication and storage.

Nylon plugs resist chemicals better than aluminum plugs and are more wear resistant than polyethylene plugs. You can install them manually or with a hex-head wrench or socket.

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

Nylon with External Hex Drive

Nylon

Thread
Size	Pitch, mm	Ht., mm	Max. Temp., °F	Hardness	Color	Pkg. Qty.		Pkg.
M14	1.5	10	150°	Durometer 55D	Yellow	50	0000000	000000

T-Slot Nuts

Designed to slide into T-slot tracks on machine tool tables, use these nuts to secure clamps and workpieces.

Fully threaded nuts allow a stud to extend beyond the bottom of the nut.

Stainless steel nuts have excellent corrosion resistance. They are a good choice for use with stainless steel parts or in EDM applications.

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

Metric

			Base				Fully Threaded
Thread Size	Thread Pitch, mm	For Slot Wd., mm	Ht., mm	Wd., mm	O'all Ht., mm	Specifications Met		Each
Black-Oxide Steel
M14	2	16	9	25	18	DIN 508	000000000	00000
M14	2	18	10	28	20	DIN 508	000000000	0000
18-8 Stainless Steel
M14	2	16	9	25	18	DIN 508	000000000	00000

Drop-In T-Slot Nuts

Install these nuts from the top of the T-slot track and secure with a quarter turn to anchor clamps and workpieces. Also known as quarter-turn T-slot nuts.

Fully threaded nuts allow a stud to extend beyond the bottom of the nut.

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

Metric

Thread			Base			Fully Threaded
Size	Pitch, mm	For Slot Wd., mm	Ht., mm	Wd., mm	O'all Ht., mm		Each
Black-Oxide Steel
M14	2	16	9	25	18	000000000	000000

Email Us

About Nuts, Materials, and Finishes

How to Install Key-Locking Inserts

How to Install Helical Inserts

About Helical Insert Length

18-8 Stainless Steel Key-Locking Inserts

Black-Phosphate Steel Key-Locking Inserts

Key-Locking Inserts with Installation Tool

Stainless Steel Helical Inserts

Stainless Steel Screw-Locking Helical Inserts

Helical Inserts with Installation Tools

Spark Plug Thread Repair Kits

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

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

18-8 Stainless Steel Easy-to-Install Thread-Locking Inserts

Metric Steel Hex Weld Nuts

Stainless Steel Socket Nuts

Alloy Steel Socket Nuts

Installation Tools for Key-Locking Inserts

Heavy Duty Installation Tools for Key-Locking Inserts

Installation Bits for Slotted-Drive Inserts

Installation Tools for Helical Inserts

Extraction Tools for Helical Inserts

Threaded Round Plugs for Straight-Thread Pipe

T-Slot Nuts

Drop-In T-Slot Nuts