System of Measurement System of Measurement |
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Thread Size Thread Size | Show |
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Thread Type Thread Type |
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Threaded Insert Type Threaded Insert Type |
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![]() | Helical |
Specifications Met Specifications Met |
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Material Material |
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Thread Spacing Thread Spacing |
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For Maximum Hole Diameter For Maximum Hole Diameter |
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Helical Insert Style Helical Insert Style |
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Passivation Passivation |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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End Type End Type |
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For Use In For Use In |
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Tensile Strength Tensile Strength |
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Drill Bit Size Drill Bit Size |
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For Tap Type For Tap Type |
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Thread Direction Thread Direction |
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Color Color |
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![]() | Red |
Internal Locking Type Internal Locking Type |
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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 | Closed-End Hole Taps | Installation Tools | Prong Break-Off Tools | |||||||||||
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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 | |||||||||||||||
4-48 | 0.112" | No. 31 | 0.12" | MS124-671 | 10 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 000000 |
4-48 | 0.168" | No. 31 | 0.12" | MS124-711 | 10 | 000000000 | 0000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |
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 | |||||||||||||||
4-48 | 0.112" | No. 31 | 0.12" | MS21209F0410, NASM21209 | 10 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 0000000 | 000000000 | 000000 |
4-48 | 0.168" | No. 31 | 0.12" | MS21209F0415, NASM21209 | 10 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 000000 | 000000000 | 00000 |