How to Install Helical Inserts
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About Helical Insert Length
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Male-Female Threaded Hex Standoffs
Position components in assemblies, as well as separate or connect parts with these standoffs. The flat sides of the hex ensure a firm grip when tightening with a wrench.
18-8 stainless steel standoffs have good corrosion resistance and may be mildly magnetic.
For technical drawings and 3-D models, click on a part number.
Thread (A) | Thread (B) | Each | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Size | Pitch, mm | Lg., mm | Size | Pitch, mm | Min. Lg., mm | Specifications Met | 1-9 | 10-Up | |
6 mm Hex Size | ||||||||||
| 5 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 2.4 | ASTM A581 or A582 | 000000000 | 00000 | 00000 |
| 6 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 2.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 8 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 4.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 10 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 6.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 12 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 8.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 13 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 14 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 16 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 19 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 20 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 22 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 25 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 31 | M3.5 | 0.6 | 6.3 | M3.5 | 0.6 | 9.5 | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
Female Threaded Hex Standoffs
Standoffs position components in assemblies, as well as separate or connect parts. The flat sides of the hex ensure a firm grip when tightening with a wrench.
18-8 stainless steel standoffs have good corrosion resistance and may be mildly magnetic.
Zinc-plated steel standoffs provide some corrosion resistance.
Aluminum standoffs are lightweight, nonmagnetic, and mildly corrosion resistant. Material can vary between 6061 and 2011 aluminum.
Nylon standoffs have excellent wear and abrasion resistance and also offer resistance to chemicals and solvents (except mineral acids). Exposure to moisture may cause them to expand.
For technical drawings and 3-D models, click on a part number.
Each | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Thread Size | Thread Pitch, mm | Threading | Thread Lg., mm | Min. Thread Lg., mm | Specifications Met | 1-9 | 10-Up | |
6 mm Hex Size | |||||||||
| 3 | M3.5 | 0.6 | Fully Threaded | 3 | __ | ASTM A581 or A582 | 000000000 | 00000 | 00000 |
| 4 | M3.5 | 0.6 | Fully Threaded | 4 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 5 | M3.5 | 0.6 | Fully Threaded | 5 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 6 | M3.5 | 0.6 | Fully Threaded | 6 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 8 | M3.5 | 0.6 | Fully Threaded | 8 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 10 | M3.5 | 0.6 | Fully Threaded | 10 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 12 | M3.5 | 0.6 | Fully Threaded | 12 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 13 | M3.5 | 0.6 | Fully Threaded | 13 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 14 | M3.5 | 0.6 | Fully Threaded | 14 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 16 | M3.5 | 0.6 | Fully Threaded | 16 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 19 | M3.5 | 0.6 | Fully Threaded | 19 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 20 | M3.5 | 0.6 | Fully Threaded | 20 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 25 | M3.5 | 0.6 | Fully Threaded | 25 | __ | ASTM A581 or A582 | 000000000 | 0000 | 0000 |
| 30 | M3.5 | 0.6 | Partially Threaded | __ | 9.5 | ASTM A582 | 000000000 | 0000 | 0000 |
Each | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Thread Size | Thread Pitch, mm | Threading | Thread Lg., mm | Min. Thread Lg., mm | Specifications Met | 1-9 | 10-Up | |
6 mm Hex Size | |||||||||
| 3 | M3.5 | 0.6 | Fully Threaded | 3 | __ | ASTM A108 | 000000000 | 00000 | 00000 |
| 4 | M3.5 | 0.6 | Fully Threaded | 4 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 5 | M3.5 | 0.6 | Fully Threaded | 5 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 6 | M3.5 | 0.6 | Fully Threaded | 6 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 8 | M3.5 | 0.6 | Fully Threaded | 8 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 10 | M3.5 | 0.6 | Fully Threaded | 10 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 12 | M3.5 | 0.6 | Fully Threaded | 12 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 13 | M3.5 | 0.6 | Fully Threaded | 13 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 14 | M3.5 | 0.6 | Fully Threaded | 14 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 16 | M3.5 | 0.6 | Fully Threaded | 16 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 19 | M3.5 | 0.6 | Fully Threaded | 19 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 20 | M3.5 | 0.6 | Fully Threaded | 20 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 25 | M3.5 | 0.6 | Fully Threaded | 25 | __ | ASTM A108 | 000000000 | 0000 | 0000 |
| 30 | M3.5 | 0.6 | Partially Threaded | __ | 9.5 | ASTM A108 | 000000000 | 0000 | 0000 |
Each | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg., mm | Thread Size | Thread Pitch, mm | Threading | Thread Lg., mm | Min. Thread Lg., mm | 1-9 | 10-Up | |
6 mm Hex Size | ||||||||
| 3 | M3.5 | 0.6 | Fully Threaded | 3 | __ | 000000000 | 00000 | 00000 |
| 4 | M3.5 | 0.6 | Fully Threaded | 4 | __ | 000000000 | 000 | 000 |
| 5 | M3.5 | 0.6 | Fully Threaded | 5 | __ | 000000000 | 000 | 000 |
| 6 | M3.5 | 0.6 | Fully Threaded | 6 | __ | 000000000 | 000 | 000 |
| 8 | M3.5 | 0.6 | Fully Threaded | 8 | __ | 000000000 | 000 | 000 |
| 10 | M3.5 | 0.6 | Fully Threaded | 10 | __ | 000000000 | 000 | 000 |
| 12 | M3.5 | 0.6 | Fully Threaded | 12 | __ | 000000000 | 000 | 000 |
| 13 | M3.5 | 0.6 | Fully Threaded | 13 | __ | 000000000 | 000 | 000 |
| 14 | M3.5 | 0.6 | Fully Threaded | 14 | __ | 000000000 | 0000 | 000 |
| 16 | M3.5 | 0.6 | Fully Threaded | 16 | __ | 000000000 | 0000 | 000 |
| 19 | M3.5 | 0.6 | Fully Threaded | 19 | __ | 000000000 | 0000 | 000 |
| 20 | M3.5 | 0.6 | Fully Threaded | 20 | __ | 000000000 | 0000 | 0000 |
| 25 | M3.5 | 0.6 | Fully Threaded | 25 | __ | 000000000 | 0000 | 0000 |
| 30 | M3.5 | 0.6 | Partially Threaded | __ | 9.4 | 000000000 | 0000 | 0000 |
Each | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg., mm | Thread Size | Thread Pitch, mm | Threading | Thread Lg., mm | Min. Thread Lg., mm | Temperature Range, °F | Color | Specifications Met | 1-9 | 10-Up | |
6 mm Hex Size | |||||||||||
| 3 | M3.5 | 0.6 | Fully Threaded | 3 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 00000 | 00000 |
| 4 | M3.5 | 0.6 | Fully Threaded | 4 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 5 | M3.5 | 0.6 | Fully Threaded | 5 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 6 | M3.5 | 0.6 | Fully Threaded | 6 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 8 | M3.5 | 0.6 | Fully Threaded | 8 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 10 | M3.5 | 0.6 | Fully Threaded | 10 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 12 | M3.5 | 0.6 | Fully Threaded | 12 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 13 | M3.5 | 0.6 | Fully Threaded | 13 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 14 | M3.5 | 0.6 | Fully Threaded | 14 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 16 | M3.5 | 0.6 | Fully Threaded | 16 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 19 | M3.5 | 0.6 | Fully Threaded | 19 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 20 | M3.5 | 0.6 | Fully Threaded | 20 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 25 | M3.5 | 0.6 | Fully Threaded | 25 | __ | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
| 30 | M3.5 | 0.6 | Partially Threaded | __ | 9.5 | -40° to 250° | Off-White | ASTM D4066 | 000000000 | 0000 | 0000 |
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.
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 | 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 | |||||||||||||||||
| M3.5 | 0.6 | Coarse | 3.5 | 3.7 mm | 3.7mm | DIN 8140, SAE MA3279-103 | 5 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 | 000000000 | 0000000 |
| M3.5 | 0.6 | Coarse | 5.3 | 3.7 mm | 3.7mm | DIN 8140, SAE MA3279-153 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
| M3.5 | 0.6 | Coarse | 7 | 3.7 mm | 3.7mm | DIN 8140, SAE MA3279-203 | 5 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 000000 | 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.
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 | 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 | |||||||||||||||||
| M3.5 | 0.6 | Coarse | 5.3 | 3.7 mm | 3.7mm | DIN 8140, SAE MA3329-153 | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 0000000 | 000000000 | 0000000 |
Tapping Inserts for Soft Metal
Also known as Tap-Lok inserts, these inserts cut their own threads in soft metals such as aluminum, so there’s no need to tap the hole. Install them into a drilled hole with an installation tool and a ratchet wrench. Installation tools can also be placed in the chuck on a drill press and turned by hand.
For technical drawings and 3-D models, click on a part number.
Tapered Heat-Set Inserts for Plastic
The tapered shape makes it easier to guide these inserts into a hole during installation. Use a drill bit to create a straight hole, then taper the top half. Heat inserts with a soldering tip so that they melt the plastic when installed. As the plastic cools, it solidifies around the knurls and ridges on the insert for excellent resistance to both torque and pull-out.
Made with lead, brass inserts are stronger than aluminum and other brass alloys but not as strong as 18-8 stainless steel inserts. They have good corrosion resistance.
Aluminum inserts are 70% lighter than brass and 18-8 stainless steel inserts, have good corrosion resistance, and are lead-free. Since they’re lead-free, they can be safely recycled.
18-8 stainless steel inserts are stronger than brass and aluminum inserts, have excellent corrosion resistance, and are lead-free. Since they’re lead-free, they can be safely recycled.
Inserts that meet ASTM standards comply with specifications for material quality.
For technical drawings and 3-D models, click on a part number.
Inserts | Soldering Installation Tips | Extraction Tips | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thread Size | Thread Pitch, mm | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | For Hole Taper Angle | Specifications Met | Pkg. Qty. | Pkg. | Each | Each | |||
Brass | |||||||||||||
| M3.5 | 0.6 | 3.81 | No. 8 | 0.199" | 8° | ASTM B16 | 50 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
| M3.5 | 0.6 | 6.35 | No. 13 | 0.185" | 8° | ASTM B16 | 50 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
Aluminum | |||||||||||||
| M3.5 | 0.6 | 3.81 | No. 8 | 0.199" | 8° | __ | 25 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 |
18-8 Stainless Steel | |||||||||||||
| M3.5 | 0.6 | 6.35 | No. 13 | 0.185" | 8° | ASTM A380 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 |
| Soldering Iron, 60W | 00000000 | Each | 000000 |
Tapered Heat-Set Insert Assortments for Plastic with Installation Tools
Assortments include various sizes of tapered inserts, a soldering iron, a ceramic insulation tube, and installation tips. The tapered shape makes it easy to guide these inserts into a hole during installation. Use a drill bit to create a straight hole, then taper the top half. Heat inserts with the soldering iron so that they melt the plastic when installed. As the plastic cools, it solidifies around the knurls and ridges on the insert for excellent resistance to both torque and pull-out. Made from brass, they’re corrosion resistant, electrically conductive, and nonmagnetic.
| Includes | No. of Inserts Included | Drill Bit Size | For Max. Hole Dia. | For Hole Taper Angle | Each | |
Metric | ||||||
|---|---|---|---|---|---|---|
Brass | ||||||
| M2.5×0.45 mm Thread × 3.43 mm Installed Lg. (10 Each) M2.5×0.45 mm Thread × 5.56 mm Installed Lg. (10 Each) M3×0.5 mm Thread × 3.8 mm Installed Lg. (25 Each) M3×0.5 mm Thread × 6.35 mm Installed Lg. (25 each) M3.5×0.6 mm Thread × 3.81 mm Installed Lg. (25 Each) M3.5×0.6 mm Thread × 6.35 mm Installed Lg. (25 Each) M4×0.7 mm Thread × 4.7 mm Installed Lg. (25 Each) M4×0.7 mm Thread × 7.92 mm Installed Lg. (25 Each) M5×0.8 mm Thread × 6.73 mm Installed Lg. (25 Each) M5×0.8 mm Thread × 11.13 mm Installed Lg. (10 Each) M6×1 mm Thread × 7.62 mm Installed Lg. (10 Each) M6×1 mm Thread × 12.7 mm Installed Lg. (10 Each) Ceramic Insulation Tube Installation Tips Soldering Iron | 225 | 9/64", No. 24, No. 13, No. 8, No. 2, J, N, O, S | 9/64", 0.152", 0.185", 0.199", 0.221", 0.277", 0.302", 0.316", 0.348" | 8° | 000000000 | 0000000 |
Heat-Set Inserts for Plastic
Install these inserts into plastic parts to create a secure base for fasteners. Also known as Chevron and headed inserts, they are often used to strengthen mounting holes on brittle plastics, such as on 3D printed parts. Unlike plastic threads, which wear down with repeated use, these threads hold their shape over a long life. Press inserts into straight holes that have been drilled, printed, or molded into plastic parts, then heat them with a soldering tip to melt the surrounding plastic. As the plastic cools, it fuses to the sharp, diagonal ridges around the inserts, which withstand torque and prevent the inserts from being pulled out. The interior is fully threaded, so you can access the threads from both sides of a through-hole.
Flanged inserts have a wider end than standard inserts, which gives them a larger load-bearing surface and makes them harder to pull out. The flange also gives you a larger contact area for soldering. When threading into the flanged side, these inserts prevent over-tightening, which can cause brittle plastic to crack.
Made with lead, brass inserts are stronger than aluminum and other brass alloys but not as strong as 18-8 stainless steel inserts. They have good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Male Threaded Heat-Set Inserts for Plastic
With the male threaded end on these inserts, mount components directly to plastic parts. The other end has two bands of diagonal knurls that face opposite directions to resist torque and pulling out. Heat the inserts on a hot plate, then press the knurled end into a straight hole. The heat melts the surrounding plastic, and as it cools it hardens around the knurls.
Compared to 3D printed or other plastic male threads that wear down when used over and over, these inserts are brass, which create a stronger fastening base. Brass is also corrosion resistant, nonmagnetic, and can be used as an electrical contact.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Thread Pitch, mm | Thread Lg., mm | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia., mm | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| M3.5 | 0.6 | 9.525 | 7.1 | No. 12 | 4.9 | 000000000 | 00000 |
Brass Screw-to-Expand Inserts for Plastic
Made from brass, these inserts are electrically conductive, nonmagnetic, and have good corrosion resistance. Press them into a drilled hole, then install a screw to expand the insert and drive the knurls into the surrounding plastic to keep it secure.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Thread Pitch, mm | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | Pkg. Qty. | Pkg. | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| M3.5 | 0.6 | 6.4 | 4.8 mm | 4.8 mm | 50 | 000000000 | 000000 |
18-8 Stainless Steel Twist-Resistant Hex-Shaped Inserts for Plastic
These 18-8 stainless steel inserts have good corrosion resistance and may be mildly magnetic. The hex-shaped body resists loosening and twisting in a round hole. Press into a drilled hole to install.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Thread Pitch, mm | Installed Lg., mm | Drill Bit Size, mm | For Max. Hole Dia., mm | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| M3.5 | 0.6 | 5.8 | 4.7 | 4.7 | 25 | 000000000 | 000000 |
Aluminum Twist-Resistant Hex-Shaped Inserts for Plastic
70% lighter than stainless steel, these aluminum inserts are mildly corrosion resistant and nonmagnetic. The hex-shaped body resists loosening and twisting in a round hole. Press into a drilled hole to install.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Thread Pitch, mm | Installed Lg., mm | Drill Bit Size | For Max. Hole Dia. | Pkg. Qty. | Pkg. | |
Aluminum | |||||||
|---|---|---|---|---|---|---|---|
| M3.5 | 0.6 | 5.84 | 4.75 mm | 4.75mm | 25 | 000000000 | 00000 |