M2 Helicoils | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

0.4 mm

	Thread Type Thread Type

Metric

	Material Material

18-8 Stainless Steel

Nitronic 60 Stainless Steel

	Helical Insert Style Helical Insert Style

With Prong

Without Prong

	Installed Length Installed Length

Less than 5 mm

	Specifications Met Specifications Met

DIN

SAE

	For Minimum Material Thickness For Minimum Material Thickness

Less than 5 mm

	Drill Bit Size Drill Bit Size

2.1 mm

	For Thread Pitch For Thread Pitch

0.4 mm

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

RoHS Compliant

	For System of Measurement For System of Measurement

Inch

Metric

	Thread Spacing Thread Spacing

Coarse

	For Tap Type For Tap Type

Helical

	For Thread Direction For Thread Direction

Right Hand

Left Hand

	For Helical Insert Style For Helical Insert Style

With Prong

Without Prong

	For Maximum Hole Diameter For Maximum Hole Diameter

Less than 5 mm

	Tensile Strength Tensile Strength

200,000 psi

	Passivation Passivation

Not Passivated

	Thread Direction Thread Direction

	Right Hand

	For Thread Type For Thread Type

Metric

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

REACH Compliant

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16 Products

How to Install Helical Inserts

About Helical Insert Length

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		Prong Break-Off 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		Each
18-8 Stainless Steel—Right-Hand Threaded
M2	0.4	Coarse	2	2.1 mm	2.1mm	DIN 8140, SAE MA3279-140	10	000000000	000000	000000000	0000000	000000000	0000000	000000000	0000000	000000000	0000000
M2	0.4	Coarse	3	2.1 mm	2.1mm	DIN 8140, SAE MA3279-190	10	000000000	00000	000000000	000000	000000000	000000	000000000	000000	000000000	000000
M2	0.4	Coarse	4	2.1 mm	2.1mm	DIN 8140, SAE MA3279-240	10	000000000	00000	000000000	000000	000000000	000000	000000000	000000	000000000	000000

Stainless Steel Helical Inserts for Particle-Free Environments

Made of Nitronic 60 stainless steel, these inserts prevent the screw from binding or sticking without any coating or lubricant that could contaminate particle-free environments. 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. Installation requires a drill bit, a helical insert tap, an installation tool, and a prong break-off tool.

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

Metric

Inserts								Through-Hole Taps		Closed-End Hole Taps		Installation Tools		Prong Break-Off Tools
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size, mm	For Max. Hole Dia., mm	Pkg. Qty.		Pkg.		Each		Each		Each		Each
Nitronic 60 Stainless Steel
M2	0.4	3	2.1	2.1	5	000000000	00000	000000000	0000000	000000000	0000000	000000000	0000000	000000000	0000000

Stainless Steel Helical Inserts without Prong

Without a prong to break off and retrieve, these inserts are often used where debris could cause damage. Also known as Heli-Coil inserts, they have coils that expand once installed to securely anchor the insert. Installation requires a drill bit, a helical insert tap, and an installation tool.

Add an extraction tool to remove these inserts.

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

Metric

Inserts								Through-Hole Taps		Closed-End Hole Taps		Installation Tools		Extraction Tools
Thread Size	Thread Pitch, mm	Installed Lg., mm	Drill Bit Size	For Max. Hole Dia.	Pkg. Qty.		Pkg.		Each		Each		Each		Each
18-8 Stainless Steel
M2	0.4	2	2.1 mm	2.1mm	5	000000000	00000	000000000	0000000	000000000	0000000	000000000	0000000	000000000	0000000
M2	0.4	3	2.1 mm	2.1mm	5	000000000	0000	000000000	000000	000000000	000000	000000000	000000	000000000	000000
M2	0.4	4	2.1 mm	2.1mm	5	000000000	0000	000000000	000000	000000000	000000	000000000	000000	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
M2	0.4	K	000000000	0000000

Prong Break-Off Tools for Helical Inserts

Place the tip of these tools into installed inserts and push down to trigger the spring-loaded punch to break off the prong.

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

Metric

For Thread Size		Each
M2	000000000	0000000

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
1-64, 1-72, M2	000000000	0000000

Installation Tools for Helical Inserts without Prong

Screw an insert onto these tools and drive them a quarter to half-turn below the material’s surface.

Tools with a hollow handle store the tip.

Replacement tips (sold separately) include one installation tip, two pins, and two springs.

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

Metric

Installation Tools
For Thread						Replacement Tips
Size	Pitch, mm	Features	Style		Each		Each
M2	0.4	Hollow Handle	A	000000000	0000000	000000000	000000

Extraction Tools for Helical Inserts without Prong

Thread these tools into an insert and turn counterclockwise to extract.

Tools with a hollow handle store the tip.

Replacement tips (sold separately) come with one removal tip, two pins, and two springs.

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

Metric

Extraction Tools			Replacement Tips
For Thread Size		Each		Each
M2	000000000	0000000	000000000	000000