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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.
Inch
Inserts | Through-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 | ||||
18-8 Stainless Steel—Left-Hand Threaded | ||||||||||||
| 1/4"-20 | 3/8" | H | 0.266" | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 |
| 1/4"-28 | 3/8" | 6.7 mm | 6.7mm | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 5/16"-18 | 0.469" | Q | 0.332" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 5/16"-24 | 0.469" | 21/64" | 21/64" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 3/8"-16 | 0.562" | X | 0.397" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 3/8"-24 | 0.562" | 25/64" | 25/64" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 1/2"-13 | 3/4" | 17/32" | 17/32" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 1/2"-20 | 3/4" | 33/64" | 33/64" | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 |
| 5/8"-11 | 0.938" | 21/32" | 21/32" | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 5/8"-18 | 0.938" | 41/64" | 41/64" | 1 | 000000000 | 0000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
| 3/4"-10 | 1 1/8" | 25/32" | 25/32" | 1 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
Helical Inserts with Installation Tools
Shown with Five Inserts
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.
For technical drawings and 3-D models, click on a part number.
Inch
| Thread Size | Installed Lg. | Drill Bit Size | For Max. Hole Dia. | No. of Inserts Included | Includes | Each | |
18-8 Stainless Steel—Left-Hand Threaded | |||||||
|---|---|---|---|---|---|---|---|
| 1/4"-20 | 3/8" | 17/64" | 17/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1/4"-28 | 3/8" | 17/64" | 17/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 00000 |
| 5/16"-18 | 0.469" | 21/64" | 21/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/16"-24 | 0.469" | 21/64" | 21/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/8"-16 | 0.562" | 25/64" | 25/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/8"-24 | 0.562" | 25/64" | 25/64" | 6 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1/2"-13 | 3/4" | 17/32" | 17/32" | 4 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 1/2"-20 | 3/4" | 33/64" | 33/64" | 4 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/8"-11 | 0.938" | 21/32" | 21/32" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 5/8"-18 | 0.938" | 41/64" | 41/64" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
| 3/4"-10 | 1 1/8" | 25/32" | 25/32" | 2 | Through-Hole Tap, Installation Tool | 000000000 | 000000 |
Left-Hand Threaded Tube-End Weld Nuts
Use these tube-end nuts with left-hand threaded fasteners. You can weld them to round uncoated metal tubes to attach threaded parts, such as rod ends. Also known as tube adapters and weldable threaded tube ends.
For technical drawings and 3-D models, click on a part number.
| For Tube Wall Thick. | Thread Size | Ht. | Threading | Thread Lg. | Each | |
4130 Alloy Steel | ||||||
|---|---|---|---|---|---|---|
For 3/8" Tube OD | ||||||
| 0.058" | 10-32 | 1" | Fully Threaded | 1" | 000000000 | 00000 |
For 1/2" Tube OD | ||||||
| 0.058" | 1/4"-28 | 1" | Fully Threaded | 1" | 000000000 | 0000 |
| 0.058" | 5/16"-24 | 1" | Fully Threaded | 1" | 000000000 | 0000 |
For 5/8" Tube OD | ||||||
| 0.058" | 5/16"-24 | 1" | Partially Threaded | 3/4" | 000000000 | 0000 |
| 0.058" | 3/8"-24 | 1" | Partially Threaded | 3/4" | 000000000 | 0000 |
| 0.058" | 7/16"-20 | 1" | Fully Threaded | 1" | 000000000 | 0000 |
For 3/4" Tube OD | ||||||
| 0.058" | 5/16"-24 | 1" | Partially Threaded | 3/4" | 000000000 | 0000 |
| 0.058" | 3/8"-24 | 1" | Fully Threaded | 1" | 000000000 | 0000 |
| 0.058" | 7/16"-20 | 1" | Fully Threaded | 1" | 000000000 | 0000 |
| 0.065" | 5/16"-24 | 1 3/8" | Partially Threaded | 7/8" | 000000000 | 0000 |
| 0.065" | 3/8"-24 | 1 3/8" | Partially Threaded | 15/16" | 000000000 | 0000 |
| 0.065" | 7/16"-20 | 1 3/8" | Partially Threaded | 1 1/8" | 000000000 | 0000 |
For 7/8" Tube OD | ||||||
| 0.058" | 3/8"-24 | 1 3/8" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.058" | 7/16"-20 | 1 3/8" | Partially Threaded | 1 1/8" | 000000000 | 0000 |
| 0.058" | 1/2"-20 | 1 3/8" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.065" | 3/8"-24 | 1 3/8" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.065" | 7/16"-20 | 1 3/8" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.065" | 1/2"-20 | 1 3/8" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.083" | 3/8"-24 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.083" | 7/16"-20 | 1 1/2" | Partially Threaded | 1 1/8" | 000000000 | 0000 |
| 0.083" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
For 1" Tube OD | ||||||
| 0.058" | 3/8"-24 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.058" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.058" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.065" | 3/8"-24 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.065" | 7/16"-20 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.065" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.065" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.083" | 3/8"-24 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.083" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.083" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.095" | 3/8"-24 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.095" | 7/16"-20 | 1 1/2" | Partially Threaded | 1" | 000000000 | 0000 |
| 0.095" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.095" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
For 1 1/8" Tube OD | ||||||
| 0.058" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.058" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.065" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.065" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.083" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.083" | 3/4"-16 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.095" | 1/2"-20 | 1 1/2" | Partially Threaded | 1 1/4" | 000000000 | 0000 |
| 0.095" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
| 0.095" | 3/4"-16 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 0000 |
For 1 1/4" Tube OD | ||||||
| 0.095" | 5/8"-18 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 00000 |
| 0.095" | 3/4"-16 | 1 1/2" | Fully Threaded | 1 1/2" | 000000000 | 00000 |
| 0.12" | 5/8"-18 | 1 7/8" | Partially Threaded | 1 9/16" | 000000000 | 00000 |
| 0.12" | 3/4"-16 | 1 7/8" | Fully Threaded | 1 7/8" | 000000000 | 00000 |
For 1 3/8" Tube OD | ||||||
| 0.095" | 5/8"-18 | 1 7/8" | Partially Threaded | 1 9/16" | 000000000 | 00000 |
| 0.095" | 3/4"-16 | 1 7/8" | Fully Threaded | 1 7/8" | 000000000 | 00000 |
| 0.12" | 5/8"-18 | 1 7/8" | Partially Threaded | 1 9/16" | 000000000 | 00000 |
| 0.12" | 3/4"-16 | 1 7/8" | Fully Threaded | 1 7/8" | 000000000 | 00000 |
For 1 1/2" Tube OD | ||||||
| 0.095" | 5/8"-18 | 1 7/8" | Partially Threaded | 1 5/8" | 000000000 | 00000 |
| 0.095" | 3/4"-16 | 1 7/8" | Fully Threaded | 1 7/8" | 000000000 | 00000 |
| 0.12" | 3/4"-16 | 2" | Partially Threaded | 1 7/8" | 000000000 | 00000 |
| 0.25" | 3/4"-16 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
| 0.25" | 7/8"-14 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
For 1 3/4" Tube OD | ||||||
| 0.12" | 3/4"-16 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
| 0.12" | 1"-14 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
| 0.12" | 1 1/4"-12 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
| 0.25" | 3/4"-16 | 2" | Partially Threaded | 1 7/8" | 000000000 | 00000 |
| 0.25" | 7/8"-14 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
| 0.25" | 1"-14 | 2" | Fully Threaded | 2" | 000000000 | 00000 |
For 2" Tube OD | ||||||
| 0.25" | 1 1/4"-12 | 3 1/4" | Fully Threaded | 3 1/4" | 000000000 | 00000 |
Installation Tools for Helical Inserts
K
L
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.
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.
Inch
| For Thread Size | Each | |
| 1-64 | 000000000 | 0000000 |
| 2-56, 3-48, 3-56 | 000000000 | 000000 |
| 4-40, 4-48, 5-40 | 000000000 | 000000 |
| 6-32, 6-40 | 000000000 | 00000 |
| 8-32, 8-36 | 000000000 | 00000 |
| 10-24, 10-32, 12-24 | 000000000 | 000000 |
| 1/4"-20, 1/4"-28 | 000000000 | 000000 |
| 5/16"-18 | 000000000 | 000000 |
| 5/16"-24 | 000000000 | 000000 |
| 3/8"-16 | 000000000 | 000000 |
| 3/8"-24 | 000000000 | 000000 |
| 7/16"-14 | 000000000 | 000000 |
| 7/16"-20 | 000000000 | 000000 |
| 1/2"-13 | 000000000 | 000000 |
| 1/2"-20 | 000000000 | 000000 |
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 | |
| 1-64, 1-72, M2 | 000000000 | 0000000 |
| 2-56, 2-64, M2.2 | 000000000 | 00000 |
| 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 | 00000 |
| 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 | 00000 |
| 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 1/2"-28, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 5/8"-24, 3/4"-10, 3/4"-16, 3/4"-20, 7/8"-9, 7/8"-14, 7/8"-20, 1"-8, 1"-12, 1"-14, M12, M14, M16, M18, M20, M22, M24 | 000000000 | 00000 |
| 1 1/8"-7, 1 1/8"-12, 1 1/4"-7, 1 1/4"-8, 1 1/4"-12, 1 3/8"-6, 1 3/8"-12, 1 1/2"-6, 1 1/2"-8, 1 1/2"-12, M27, M30, M36, M39 | 000000000 | 000000 |