Products & Services

Protocase manufactures fully finished custom electronic enclosures and associated parts from a wide variety of materials and components, in 2-3 days with no minimum order. Protocase also provides expert and affordable enclosure design services.

CNC Milling

Helical Inserts

Examples:

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®.

Tang vs Tangless Helical Inserts

Helical inserts are either tang-less or contain a tang, which is a small piece of metal that's used to apply the torque required to insert the helical insert.

Protocase stocks a variety of tanged helical inserts. Tangless options can be ordered for additional leadtime and cost.

Free Running vs Self-Locking Helical Inserts

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.

Stocked Helical Inserts

Part Number Description
1185-02CN172 2-56 Helical Insert, 0.172" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-02CN172 McMaster PN 91732A201)
1185-02CN215 2-56 Helical Insert, 0.215" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-02CN215 McMaster PN 91732A202)
1185-04CN168 4-40 Helical Insert, 0.168" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-04CN168 McMaster PN 91732A285)
1185-04CN280 4-40 Helical Insert, 0.280" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-04CN280 McMaster PN 91732A702)
1185-06CN207 6-32 Helical Insert, 0.207" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-06CN207 McMaster PN 91732A286)
1185-06CN345 6-32 Helical Insert, 0.345" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-06CN345 McMaster PN 91732A708)
1185-2CN246 8-32 Helical Insert, 0.246" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-2CN246 McMaster PN 91732A287)
1185-2CN410 8-32 Helical Insert, 0.410" Length, Free Running, 304 Stainless Steel (HeliCoil PN 1185-2CN410 McMaster PN 91732A714)
3585-02CN129 2-56 Helical Insert, 0.129" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-02CN129 McMaster PN 90296A095)
3585-02CN215 2-56 Helical Insert, 0.215" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-02CN215 McMaster PN 90296A099)
3585-04CN168 4-40 Helical Insert, 0.168" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-04CN168 McMaster PN 90296A102)
3585-04CN280 4-40 Helical Insert, 0.280" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-04CN280 McMaster PN 90296A104)
3585-06CN207 6-32 Helical Insert, 0.207" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-06CN207 McMaster PN 90296A107)
3585-06CN345 6-32 Helical Insert, 0.345" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-06CN345 McMaster PN 90296A109)
3585-2CN246 8-32 Helical Insert, 0.246" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-2CN246 McMaster PN 90296A112)
3585-2CN410 8-32 Helical Insert, 0.410" Length, Self Locking, 304 Stainless Steel (HeliCoil PN 3585-2CN410 McMaster PN 90296A552)