How to Install Helical Inserts
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About Helical Insert Length
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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.
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 | |||||||||||||||||
| M8 | 1.25 | Coarse | 8 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3279-109 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | Coarse | 12 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3279-159 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 16 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3279-209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 20 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3279-259 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 24 | 8.3 mm | 8.3mm | SAE MA3279-309 | 5 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 8 | 8.3 mm | 8.3mm | DIN 8140, SAE MA3279-108 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 12 | 8.3 mm | 8.3mm | DIN 8140, SAE MA3279-158 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 16 | 8.3 mm | 8.3mm | DIN 8140, SAE MA3279-208 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 20 | 8.3 mm | 8.3mm | SAE MA3279-258 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 24 | 8.3 mm | 8.3mm | SAE MA3279-308 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 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.
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 | |||||||||||||||
| M8 | 1.25 | 8 | 8.4 | 8.4 | 5 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | 12 | 8.4 | 8.4 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | 16 | 8.4 | 8.4 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
Lubricated Stainless Steel Helical Inserts
A dry film keeps the screw from sticking or binding in these inserts during installation. 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.
Inserts that meet DIN 8140 adhere to international standards for dimensions.
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 | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | ||||||||||||||||
| M8 | 1.25 | 8 | 8.4 mm | 8.4mm | MIL-I-8846, SAE MA3280-109 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | 12 | 8.4 mm | 8.4mm | DIN 8140, MIL-I-8846, SAE MA3280-159 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | 16 | 8.4 mm | 8.4mm | DIN 8140, MIL-I-8846, SAE MA3280-209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
Lubricated Stainless Steel Helical Inserts for Dissimilar Metals
Eliminating the need for primer, these inserts are coated to resist corrosion when installed in different materials. They also prevent the screw from sticking or binding in the insert during installation. 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.
Inserts that meet DIN 8140 adhere to international standards for dimensions.
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 | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | ||||||||||||||||
| M8 | 1.25 | 8 | 8.4 mm | 8.4mm | DIN 8140 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | 12 | 8.4 mm | 8.4mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | 16 | 8.4 mm | 8.4mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
Nickel Alloy Helical Inserts
Made of nickel alloy, these inserts are more resistant to acids and salt water than stainless steel inserts. 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.
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 | For Max. Hole Dia. | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
Nickel Alloy | |||||||||||||||
| M8 | 1.25 | 8 | 8.4 mm | 8.4 mm | 1 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | 12 | 8.4 mm | 8.4 mm | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | 16 | 8.4 mm | 8.4 mm | 1 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 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.
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 | |||||||||||||||||
| M8 | 1.25 | Coarse | 8 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3329-109 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | Coarse | 12 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3329-159 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 16 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3329-209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 20 | 8.4 mm | 8.4mm | SAE MA3329-259 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 8 | 8.3 mm | 8.3mm | DIN 8140, SAE MA3329-108 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 12 | 8.3 mm | 8.3mm | DIN 8140, SAE MA3329-158 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1 | Fine | 16 | 8.3 mm | 8.3mm | SAE MA3329-208 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
Lubricated Stainless Steel Screw-Locking Helical Inserts
A dry film keeps the screw from sticking or binding in these inserts during installation, yet a distorted thread grips the screw to resist loosening. 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.
Inserts that meet DIN 8140 adhere to international standards for dimensions.
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 | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | ||||||||||||||||
| M8 | 1.25 | 8 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3330-109 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | 12 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3330-159 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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.
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 | |||||||||||||||
| M8 | 1.25 | 8 | 8.4 mm | 8.4mm | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M8 | 1.25 | 12 | 8.4 mm | 8.4mm | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
| M8 | 1.25 | 16 | 8.4 mm | 8.4mm | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
Helical Inserts with Installation Tools
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.
| Thread Size | Thread Pitch, mm | Thread Spacing | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Right-Hand Threaded | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| M8 | 1 | Fine | 12 | 8.25 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
| M8 | 1.25 | Coarse | 8 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 12 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M8 | 1.25 | Coarse | 16 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| M8 | 1.25 | Coarse | 20 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| M8 | 1.25 | Coarse | 24 | 8.3 mm | 21/64" | 10 | Drill Bit, Through-Hole Tap, Installation Tool | 000000000 | 00000 |
Helical Insert Assortments with Installation Tools
Assortments include various sizes of helical inserts and a tap, a drill bit, and an installation tool for each thread size. Also known as Heli-Coil inserts, the 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.
| Includes | No. of Inserts Included | Thread Spacing | Drill Bit Size | For Max. Hole Dia. | Each | |
Metric | ||||||
|---|---|---|---|---|---|---|
18-8 Stainless Steel | ||||||
| M5×0.8 mm Thread × 7.5 mm Installed Lg. (12 Each) M6×1 mm Thread × 9 mm Installed Lg. (12 Each) M8×1.25 mm Thread × 12 mm Installed Lg. (12 Each) M10×1.5 mm Thread × 15 mm Installed Lg. (12 Each) Drill Bits Through-Hole Taps Installation Tools | 48 | Coarse | 13/64" 1/4" 21/64" 13/32" | 13/64" 1/4" 21/64" 13/32" | 000000000 | 0000000 |
| M8×1.25 mm Thread × 8 mm Installed Lg. (6 Each) M8×1.25 mm Thread × 12 mm Installed Lg. (6 Each) M8×1.25 mm Thread × 16 mm Installed Lg. (6 Each) Drill Bit Through-Hole Tap Installation Tool | 18 | Coarse | 21/64" | 21/64" | 000000000 | 00000 |
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.
Style F cannot be used with screw-lock inserts.
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 Thread Size | Each | |
| M8 | 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 | |
| 10-24, 10-32, 12-24, 12-28, 1/4"-20, 1/4"-28, 1/4"-32, 1/4"-80, 5/16"-18, 5/16"-24, 5/16"-32, 3/8"-16, 3/8"-24, M5, M6, M7, M8, M10 | 000000000 | 000000 |
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.
Replacement tips (sold separately) include one installation tip, two pins, and two springs.
