Thread Direction Thread Direction | Show |
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Thread Direction Thread Direction | Hide |
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| Right Hand | Left Hand |
System of Measurement System of Measurement |
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Thread Size Thread Size |
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Material Material |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Helical Insert Style Helical Insert Style |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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For Tap Type For Tap Type |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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For Minimum Material Thickness For MinimumMaterial Thickness |
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Passivation Passivation |
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Tensile Strength Tensile Strength |
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For Maximum Hole Diameter For Maximum Hole Diameter |
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For Insert Thread Size For Insert Thread Size |
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For Use On For Use On |
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Application Application |
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How to Install Helical Inserts
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About Helical Insert Length
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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 | 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 | 000000 |
| 1/4"-28 | 3/8" | 6.7 mm | 6.7mm | 1 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 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 | 0000 | 000000000 | 000000 | 000000000 | 00000 | 000000 | 00 |
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.
For technical drawings and 3-D models, click on a part number.
| 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 |
Taps for Helical Inserts
Add threads to holes in preparation for installing helical inserts. These taps are made of uncoated high-speed steel and are for use on most metal and plastic. The square shank is compatible with tap wrenches and tap holders for drill presses and milling machines.
Plug-chamfer taps are a versatile choice for most tapping applications. With 3-5 chamfered cutting threads, they require moderate torque and are often used for start-to-finish tapping of through holes and closed-end holes. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.
For technical drawings and 3-D models, click on a part number.
Drill Bit | Plug Chamfer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Insert Thread Size | Thread Lg. | Overall Lg. | Max. Tapping Dp. | Size | Decimal Size Equivalent | No. of Flutes | For Insert Thread Type | Pitch Dia. Limit | Each | |
Uncoated High-Speed Steel | ||||||||||
| 1/4"-20 | 1 1/8" | 2 23/32" | 1 1/8" | H | 0.266" | 4 | UNC | H2 | 000000000 | 000000 |
| 1/4"-28 | 1 1/8" | 2 23/32" | 1 1/8" | 6.7 mm | 0.2637" | 4 | UNF | H2 | 000000000 | 00000 |
| 5/16"-18 | 1 1/4" | 2 15/16" | 1 1/4" | Q | 0.332" | 4 | UNC | H3 | 000000000 | 00000 |
| 5/16"-24 | 1 1/4" | 2 15/16" | 1 1/4" | 21/64" | 0.3281" | 4 | UNF | H4 | 000000000 | 00000 |
| 3/8"-16 | 1 21/32" | 3 3/8" | 1 21/32" | X | 0.397" | 4 | UNC | H3 | 000000000 | 00000 |
| 3/8"-24 | 1 7/16" | 3 5/32" | 1 7/16" | 25/64" | 0.3906" | 4 | UNF | H3 | 000000000 | 00000 |
| 1/2"-13 | 1 13/16" | 3 13/16" | 1 13/16" | 17/32" | 0.5313" | 4 | UNC | H3 | 000000000 | 00000 |
| 1/2"-20 | 1 21/32" | 3 19/32" | 1 21/32" | 33/64" | 0.5156" | 4 | UNF | H5 | 000000000 | 00000 |
| 5/8"-11 | 1 13/16" | 4 1/4" | 1 13/16" | 21/32" | 0.6563" | 4 | UNC | H3 | 000000000 | 000000 |
| 5/8"-18 | 1 13/16" | 4 1/32" | 1 13/16" | 41/64" | 0.6406" | 4 | UNF | H3 | 000000000 | 000000 |
| 3/4"-10 | 2 7/32" | 4.667" | 2 7/32" | 25/32" | 0.7813" | 4 | UNC | H5 | 000000000 | 000000 |