How to Install Helical Inserts
More
About Helical Insert Length
More
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.
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 | |||||||||||||||
2-56 | 0.086" | No. 41 | 0.096" | MIL-I-8846, MS122-095 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
2-56 | 0.129" | No. 41 | 0.096" | MIL-I-8846, MS122-135 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
2-56 | 0.172" | No. 41 | 0.096" | MIL-I-8846, MS122-175 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
4-40 | 0.112" | No. 31 | 0.12" | MIL-I-8846, MS122-076 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
4-40 | 0.168" | No. 31 | 0.12" | MIL-I-8846, MS122-116 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
4-40 | 0.224" | No. 31 | 0.12" | MIL-I-8846, MS122-156 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
6-32 | 0.138" | No. 25 | 0.1495" | MIL-I-8846, MS122-078 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
6-32 | 0.207" | No. 25 | 0.1495" | MIL-I-8846, MS122-118 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
6-32 | 0.276" | No. 25 | 0.1495" | MIL-I-8846, MS122-158 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
10-24 | 0.285" | No. 5 | 0.2055" | MIL-I-8846, MS122-120 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.19" | 13/64" | 13/64" | MIL-I-8846, MS124-655 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.285" | 13/64" | 13/64" | MIL-I-8846, MS124-695 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.38" | 13/64" | 13/64" | MIL-I-8846, MS124-735 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 1/4" | H | 0.266" | MIL-I-8846, MS122-081 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 3/8" | H | 0.266" | MIL-I-8846, MS122-121 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 1/2" | H | 0.266" | MIL-I-8846, MS122-161 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 0.312" | Q | 0.332" | MIL-I-8846, MS120-082 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 0.469" | Q | 0.332" | MIL-I-8846, MS122-121 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 5/8" | Q | 0.332" | MIL-I-8846, MS122-162 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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 | ||||||||||||||||
M2.5 | 0.45 | 2.5 | No. 37 | 0.104" | DIN 8140, MIL-I-8846, SAE MA3280-101 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
M2.5 | 0.45 | 5 | No. 37 | 0.104" | DIN 8140, MIL-I-8846, SAE MA3280-201 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M3 | 0.5 | 3 | 3.2 mm | 3.2mm | DIN 8140, MIL-I-8846, SAE MA3280-102 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M3 | 0.5 | 4.5 | 3.2 mm | 3.2mm | DIN 8140, MIL-I-8846, SAE MA3280-152 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M3 | 0.5 | 6 | 3.2 mm | 3.2mm | DIN 8140, MIL-I-8846, SAE MA3280-202 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M4 | 0.7 | 4 | No. 19 | 0.166" | DIN 8140, MIL-I-8846, SAE MA3280-104 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M4 | 0.7 | 6 | No. 19 | 0.166" | DIN 8140, MIL-I-8846, SAE MA3280-154 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M4 | 0.7 | 8 | No. 19 | 0.166" | DIN 8140, MIL-I-8846, SAE MA3280-204 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M5 | 0.8 | 5 | 5.3 mm | 5.3mm | DIN 8140, MIL-I-8846, SAE MA3280-105 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M5 | 0.8 | 7.5 | 5.3 mm | 5.3mm | DIN 8140, MIL-I-8846, SAE MA3280-155 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 6 | 6.3 mm | 6.3mm | DIN 8140, MIL-I-8846, SAE MA3280-106 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 9 | 6.3 mm | 6.3mm | DIN 8140, MIL-I-8846, SAE MA3280-156 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 12 | 6.3 mm | 6.3mm | DIN 8140, MIL-I-8846, SAE MA3280-206 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M8 | 1.25 | 8 | 8.4 mm | 8.4mm | MIL-I-8846, SAE MA3280-109 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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.
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. | Pkg. Qty. | Pkg. | Each | Each | Each | Each | |||||
18-8 Stainless Steel | ||||||||||||||
2-56 | 0.086" | No. 41 | 0.096" | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
2-56 | 0.172" | No. 41 | 0.096" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
4-40 | 0.112" | No. 31 | 0.12" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
4-40 | 0.168" | No. 31 | 0.12" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
4-40 | 0.224" | No. 31 | 0.12" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
6-32 | 0.138" | No. 25 | 0.1495" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
6-32 | 0.207" | No. 25 | 0.1495" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
6-32 | 0.276" | No. 25 | 0.1495" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
10-24 | 0.285" | No. 5 | 0.2055" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.19" | 13/64" | 13/64" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.285" | 13/64" | 13/64" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.38" | 13/64" | 13/64" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 1/4" | H | 0.266" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 3/8" | H | 0.266" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 1/2" | H | 0.266" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 0.312" | Q | 0.332" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 0.469" | Q | 0.332" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 5/8" | Q | 0.332" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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 | ||||||||||||||||
M3 | 0.5 | 4.5 | 3.2 mm | 3.2mm | DIN 8140 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
M3 | 0.5 | 6 | 3.2 mm | 3.2mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M4 | 0.7 | 4 | No. 19 | 0.166" | __ | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M4 | 0.7 | 6 | No. 19 | 0.166" | __ | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M4 | 0.7 | 8 | No. 19 | 0.166" | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M5 | 0.8 | 5 | 5.3 mm | 5.3mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M5 | 0.8 | 7.5 | 5.3 mm | 5.3mm | __ | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M5 | 0.8 | 10 | 5.3 mm | 5.3mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 9 | 6.3 mm | 6.3mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 12 | 6.3 mm | 6.3mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M8 | 1.25 | 8 | 8.4 mm | 8.4mm | DIN 8140 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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 |
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.
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 | |||||||||||||||
2-56 | 0.086" | No. 41 | 0.096" | MS21209C0210L, NASM21209 | 5 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
2-56 | 0.129" | No. 41 | 0.096" | MS21209C0215L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
2-56 | 0.172" | No. 41 | 0.096" | MS21209C0220L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
4-40 | 0.112" | No. 31 | 0.12" | MS21209C0410L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
4-40 | 0.168" | No. 31 | 0.12" | MS21209C0415L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
4-40 | 0.224" | No. 31 | 0.12" | MS21209C0420L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
6-32 | 0.138" | No. 25 | 0.1495" | MS21209C0610L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
6-32 | 0.207" | No. 25 | 0.1495" | MS21209C0615L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
6-32 | 0.276" | No. 25 | 0.1495" | MS21209C0620L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
10-24 | 0.285" | No. 5 | 0.2055" | MS21209C1-15L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.19" | 13/64" | 13/64" | MS21209F1-10L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.285" | 13/64" | 13/64" | MS21209F1-15L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
10-32 | 0.38" | 13/64" | 13/64" | MS21209F1-20L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 3/8" | H | 0.266" | MS21209C4-15L, NASM21209 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
1/4"-20 | 1/2" | H | 0.266" | MS21209C4-20L, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 0.469" | Q | 0.332" | MS21209C5-15L, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
5/16"-18 | 5/8" | Q | 0.332" | MS21209C5-20L, NASM21209 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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 | ||||||||||||||||
M2.5 | 0.45 | 3.8 | No. 37 | 0.104" | DIN 8140, SAE MA3330-151 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 |
M4 | 0.7 | 4 | No. 19 | 0.166" | DIN 8140, SAE MA3330-104 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M4 | 0.7 | 6 | No. 19 | 0.166" | DIN 8140, SAE MA3330-154 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M4 | 0.7 | 8 | No. 19 | 0.166" | DIN 8140, SAE MA3330-204 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
M5 | 0.8 | 5 | 5.3 mm | 5.3mm | SAE MA3330-105 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M5 | 0.8 | 7.5 | 5.3 mm | 5.3mm | DIN 8140, SAE MA3330-155 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M5 | 0.8 | 10 | 5.3 mm | 5.3mm | DIN 8140, SAE MA3330-205 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 6 | 6.3 mm | 6.3mm | SAE MA3330-106 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 9 | 6.3 mm | 6.3mm | DIN 8140, SAE MA3330-156 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M6 | 1 | 12 | 6.3 mm | 6.3mm | DIN 8140, SAE MA3330-206 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
M8 | 1.25 | 8 | 8.4 mm | 8.4mm | DIN 8140, SAE MA3330-109 | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 |
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 |
Lubricated Stainless Steel Helical Inserts without Prong

A dry film keeps the screw from sticking or binding in these inserts during installation. Without a prong to break off and retrieve, they 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.
For technical drawings and 3-D models, click on a part number.
Inserts | Through-Hole Taps | Closed-End Hole Taps | Installation Tools | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | Pkg. Qty. | Pkg. | Each | Each | Each | ||||
18-8 Stainless Steel | ||||||||||||
2-56 | 0.086" | No. 41 | 0.096" | 5 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
2-56 | 0.129" | No. 41 | 0.096" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
2-56 | 0.172" | No. 41 | 0.096" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
4-40 | 0.112" | No. 31 | 0.12" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
4-40 | 0.168" | No. 31 | 0.12" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
4-40 | 0.224" | No. 31 | 0.12" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
6-32 | 0.138" | No. 25 | 0.1495" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
6-32 | 0.207" | No. 25 | 0.1495" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
6-32 | 0.276" | No. 25 | 0.1495" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
8-32 | 0.164" | No. 16 | 0.177" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
8-32 | 0.246" | No. 16 | 0.177" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
8-32 | 0.328" | No. 16 | 0.177" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
10-32 | 0.19" | 13/64" | 13/64" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
10-32 | 0.285" | 13/64" | 13/64" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
10-32 | 0.38" | 13/64" | 13/64" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
1/4"-20 | 1/4" | H | 0.266" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
1/4"-20 | 3/8" | H | 0.266" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
1/4"-20 | 1/2" | H | 0.266" | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
Alloy Steel Thin-Wall Swage-Locking Inserts



Add or repair threads near the edges and corners of soft metal surfaces—these inserts have thinner walls than any of our key-locking and thread-locking inserts. With knurls that press (swage) into the surrounding material, they won’t budge when you tighten a screw. Made of alloy steel, they’re stronger than our 17-4 PH stainless steel inserts. They absorb impact without fracturing and stand up to high-pressure applications. A cadmium plating keeps them from corroding in wet environments. On top of the plating is a dry film lubricant to help these inserts thread in without sticking. Meeting the strict standards for MIL-I-45932/1, these inserts have highly precise threads and tight tolerances.
To install these inserts, you need a drill bit, a counterbore, a standard-sized tap, an installation tool, and a hammer. Drill a hole, counterbore the top, then tap it. Place the insert into the installation tool and hand-tighten it into the tapped hole. Hammer the tool to secure the insert in place, driving the knurls into the surrounding material.
For technical drawings and 3-D models, click on a part number.
Inserts | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
For Counterbore | Installation Tools | |||||||||
Thread Size | For Tap Thread Size | Installed Lg. | For Max. Hole Dia. | Dia. | Dp. | Specifications Met | Each | Each | ||
Dry-Film-Lubricated Cadmium-Plated Alloy Steel | ||||||||||
2-56 | 6-40 | 9/64" | 0.113" | 0.138" | 0.045" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 0000000 |
4-40 | 8-32 | 13/64" | 0.14" | 0.164" | 0.052" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
6-32 | 10-32 | 7/32" | 0.166" | 0.187" | 0.065" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
8-32 | 12-28 | 1/4" | 0.191" | 0.216" | 0.065" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
10-24 | 1/4"-28 | 19/64" | 0.221" | 0.25" | 0.082" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
10-32 | 1/4"-28 | 19/64" | 0.221" | 0.25" | 0.082" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
1/4"-20 | 5/16"-24 | 25/64" | 0.281" | 0.312" | 0.082" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
1/4"-28 | 5/16"-24 | 25/64" | 0.281" | 0.312" | 0.082" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
5/16"-18 | 3/8"-24 | 31/64" | 0.343" | 0.375" | 0.082" | MIL-I-45932/1 | 000000000 | 0000 | 00000000 | 000000 |
5/16"-24 | 3/8"-24 | 31/64" | 0.343" | 0.375" | 0.082" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
3/8"-16 | 7/16"-20 | 9/16" | 0.404" | 0.437" | 0.113" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
3/8"-24 | 7/16"-20 | 9/16" | 0.404" | 0.437" | 0.113" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
7/16"-14 | 1/2"-20 | 43/64" | 0.468" | 0.5" | 0.113" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
7/16"-20 | 1/2"-20 | 43/64" | 0.468" | 0.5" | 0.113" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
1/2"-13 | 9/16"-24 | 3/4" | 0.531" | 0.562" | 0.113" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
1/2"-20 | 9/16"-24 | 3/4" | 0.531" | 0.562" | 0.113" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
9/16"-12 | 11/16"-12 | 27/32" | 0.625" | 0.687" | 0.15" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
9/16"-18 | 11/16"-12 | 27/32" | 0.625" | 0.687" | 0.15" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
5/8"-11 | 3/4"-16 | 61/64" | 0.703" | 0.75" | 0.156" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
5/8"-18 | 3/4"-16 | 61/64" | 0.703" | 0.75" | 0.156" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
3/4"-10 | 7/8"-20 | 1 1/8" | 0.844" | 0.875" | 0.156" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |
3/4"-16 | 7/8"-20 | 1 1/8" | 0.844" | 0.875" | 0.156" | MIL-I-45932/1 | 000000000 | 00000 | 00000000 | 000000 |