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Helical inserts are inserts made of coiled wire with a diamond-shaped cross-section. They screw into a threaded hole to form a mating internal thread for a screw or stud.
Because of this, helical inserts are the ideal option for creating high-strength threads in soft alloys like aluminum in CNC machined or CNC turned parts.
Helical inserts are also commonly known as screw thread inserts (STIs), or their Stanley Engineering Fastening brand name Heli-Coil®.
Helical inserts are either tang-less or contain a tang, which is a small piece of metal that is used to apply the torque required to insert the helical insert.
We stock a variety of tanged helical inserts. Tangless options can be ordered for additional lead time and cost.
Free running helical inserts have a thread that is smooth and free running.
Locking helical inserts have the same characteristics as free running, but also allow frequent removal and reassembly of screws without appreciable loss of torque and positively secure threaded members against vibration or shock loosening.
| Thread Size | Insert Length (Inches) | Free Running or Self Locking | Part Number | Material |
|---|---|---|---|---|
| 2-56 | 0.129 | Free Running | 1185-02CN129 | 304 Stainless Steel |
| 2-56 | 0.172 | Free Running | 1185-02CN172 | 304 Stainless Steel |
| 2-56 | 0.215 | Free Running | 1185-02CN215 | 304 Stainless Steel |
| 2-56 | 0.129 | Self Locking | 3585-02CN129 | 304 Stainless Steel |
| 2-56 | 0.215 | Self Locking | 3585-02CN215 | 304 Stainless Steel |
| 4-40 | 0.168 | Free Running | 1185-04CN168 | 304 Stainless Steel |
| 4-40 | 0.28 | Free Running | 1185-04CN280 | 304 Stainless Steel |
| 4-40 | 0.168 | Self Locking | 3585-04CN168 | 304 Stainless Steel |
| 4-40 | 0.28 | Self Locking | 3585-04CN280 | 304 Stainless Steel |
| 6-32 | 0.207 | Free Running | 1185-06CN207 | 304 Stainless Steel |
| 6-32 | 0.345 | Free Running | 1185-06CN345 | 304 Stainless Steel |
| 6-32 | 0.207 | Self Locking | 3585-06CN207 | 304 Stainless Steel |
| 6-32 | 0.345 | Self Locking | 3585-06CN345 | 304 Stainless Steel |
| 8-32 | 0.246 | Free Running | 1185-2CN246 | 304 Stainless Steel |
| 8-32 | 0.41 | Free Running | 1185-2CN410 | 304 Stainless Steel |
| 8-32 | 0.246 | Self Locking | 3585-2CN246 | 304 Stainless Steel |
| 8-32 | 0.41 | Self Locking | 3585-2CN410 | 304 Stainless Steel |
| Thread Size | Insert Length (mm) | Free Running or Self Locking | Part Number | Material |
|---|---|---|---|---|
| M2.5x0.45 | 3.8 | Free Running | 1084-2.5CN038 | 304 Stainless Steel |
| M2.5x0.45 | 6.3 | Free Running | 1084-2.5CN063 | 304 Stainless Steel |
| M2.5x0.45 | 3.8 | Self Locking | 4184-2.5CN038 | 304 Stainless Steel |
| M2.5x0.45 | 6.3 | Self Locking | 4184-2.5CN063 | 304 Stainless Steel |
| M3x0.5 | 4.5 | Free Running | 1084-3CN045 | 304 Stainless Steel |
| M3x0.5 | 6 | Free Running | 1084-3CN060 | 304 Stainless Steel |
| M3x0.5 | 4.5 | Self Locking | 4184-3CN045 | 304 Stainless Steel |
| M3x0.5 | 6 | Self Locking | 4184-3CN060 | 304 Stainless Steel |
| M4x0.7 | 6 | Free Running | 1084-4CN060 | 304 Stainless Steel |
| M4x0.7 | 10 | Free Running | 1084-4CN100 | 304 Stainless Steel |
| M4x0.7 | 6 | Self Locking | 4184-4CN060 | 304 Stainless Steel |
| M5x0.8 | 7.5 | Free Running | 1084-5CN075 | 304 Stainless Steel |
| M5x0.8 | 7.5 | Self Locking | 4184-5CN075 | 304 Stainless Steel |
| M6x1.0 | 9 | Free Running | 1084-6CN090 | 304 Stainless Steel |
| M6x1.0 | 9 | Self Locking | 4184-6CN090 | 304 Stainless Steel |
Our experts can design your custom enclosures exactly as you want them.
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