How to Install Helical Inserts
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About Helical Insert Length
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How to Install Key-Locking Inserts
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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 | 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 | |||||||||||||||
| M30 | 3.5 | Coarse | 45 | 1 7/32" | 1 7/32" | SAE MA3279-183 | 1 | 000000000 | 00000 | 000000000 | 0000000 | 000000000 | 0000000 | 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | |||||||||||||||
| M30 | 3.5 | Coarse | 45 | 1 7/32" | 1 7/32" | DIN 8140 | 1 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 | 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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| M30 | 3.5 | Coarse | 45 | 1 1/4" | 1 1/4" | 5 | Through-Hole Tap, Installation Tool | 000000000 | 0000000 |
18-8 Stainless Steel Key-Locking Inserts
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.
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 | |||||||||||||
| M20 | 1.5 | Extra Fine | M30 | 2 | 30mm | 28 mm | 28mm | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
| M20 | 2.5 | Coarse | M30 | 2 | 30mm | 28 mm | 28mm | 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.
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 | |||||||||||||
| M20 | 1.5 | Extra Fine | M30 | 2 | 30mm | 28 mm | 28mm | 4 | 000000000 | 000000 | 000000 | 000000000 | 000000 |
| M20 | 2.5 | Coarse | M30 | 2 | 30mm | 28 mm | 28mm | 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 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 | |||||||||||
| M20 | 1.5 | Extra Fine | M30 | 2 | 30mm | 28 mm | 28mm | 4 | 3 | 000000000 | 0000000 |
| M20 | 2.5 | Coarse | M30 | 2 | 30mm | 28 mm | 28mm | 4 | 3 | 000000000 | 000000 |
Black-Phosphate Steel with Thick Wall | |||||||||||
| M20 | 1.5 | Extra Fine | M30 | 2 | 30mm | 28 mm | 28mm | 4 | 3 | 000000000 | 00000 |
| M20 | 2.5 | Coarse | M30 | 2 | 30mm | 28 mm | 28mm | 4 | 3 | 000000000 | 00000 |
Steel Key-Locking Insert Blanks
Tap the thread size you need into the solid body of these blanks. They’re a great choice when you need a custom combination of internal thread size and external diameter. Use them to repair or add new threads in soft metals, such as aluminum. They can also plug threaded holes without the hassle of welding. Made of steel, they’re stronger than stainless steel insert blanks. A black-phosphate coating makes them mildly corrosion resistant. These insert blanks have keys that grip the surrounding material, making them more secure than thread-locking inserts.
To install, you’ll need a drill bit, tap, installation tool, and hammer.