How to Install Helical Inserts
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About Helical Insert Length
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About Nuts, Materials, and Finishes
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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.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | Prong Break-Off Tools | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size  | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel—Right-Hand Threaded | |||||||||||||||
| 3-48 | 0.099" | 7/64" | 7/64" | MS122-115 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| 3-48 | 0.148" | 7/64" | 7/64" | MS122-155 | 10 | 000000000 | 0000 | 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.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | Prong Break-Off Tools | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | |||||||||||||||
| 3-48 | 0.099" | 7/64" | 7/64" | MS21209C0310, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| 3-48 | 0.148" | 7/64" | 7/64" | MS21209C0315, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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 | |
Inch | ||||||
|---|---|---|---|---|---|---|
18-8 Stainless Steel | ||||||
| 1-64 Thread × 0.11" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 2-56 Thread × 0.129" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 3-48 Thread × 0.148" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 4-40 Thread × 0.168" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 6-32 Thread × 0.207" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) 8-32 Thread × 0.246" Installed Lg. (24 Inserts and 24 Screw-Locking Inserts) Drill Bits Through-Hole Taps Installation Tools | 288 | Coarse | 5/64" 3/32" No. 36 No. 31 No. 26 No. 17 | 5/64" 3/32" 0.1065" 0.12" 0.147" 0.173" | 000000000 | 0000000 |
Steel Press-Fit Nuts for Sheet Metal
Add permanent threads to sheet metal, like weld nuts, but without the setup and mess. A zinc plating on these steel press-fit nuts helps prevent rust in wet environments. Also known as clinch-style captive nuts, press them into a drilled or punched hole with an arbor press or similar pressure tool. The pressure forms your sheet metal into the knurls of the nut, making the nut inseparable from the sheet. Installation requires access to both sides of the panel.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Thread Size | Drill Bit Size | For Min. Panel Thick. | For Max. Panel Hardness | OD | Ht. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||
| 3-48 | No. 19 | 0.04" | Brinell 150, Rockwell B80 | 0.25" | 0.07" | 25 | 000000000 | 000000 |
Stainless Steel Press-Fit Nuts for Sheet Metal
Create permanent, corrosion-resistant threads in sheet metal without the setup and mess of weld nuts. Made of 18-8 stainless steel, these press-fit nuts withstand water and mild chemicals better than zinc-plated steel nuts. Also known as clinch-style captive nuts, press them into a drilled or punched hole with an arbor press or similar pressure tool. The pressure forms your sheet metal into the knurls of the nut, making the nut inseparable from the sheet. Installation requires access to both sides of the panel.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Drill Bit Size | For Min. Panel Thick. | For Max. Panel Hardness | OD | Ht. | PEM® Part No. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||||
| 3-48 | No. 19 | 0.03" | Brinell 125, Rockwell B70 | 0.25" | 0.07" | CLS-348-0 | 10 | 000000000 | 00000 |
| 3-48 | No. 19 | 0.04" | Brinell 125, Rockwell B70 | 0.25" | 0.07" | CLS-348-1 | 10 | 000000000 | 0000 |
| 3-48 | No. 19 | 0.056" | Brinell 125, Rockwell B70 | 0.25" | 0.07" | CLS-348-2 | 10 | 000000000 | 0000 |
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.
| For Thread Size | Style | Each | |
For Right-Hand Thread | |||
|---|---|---|---|
| 3-48 | C | 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 | |
| 3-48, 3-56, 4-40, 4-48, 5-40, 5-44, 6-32, 6-40, 8-32, 8-36, 8-40, M2.5, M3, M3.5, M4 | 000000000 | 000000 |
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.
| For Thread Size | Each | |
| 2-56, 3-48, 3-56 | 000000000 | 0000000 |