Threading: Key Inserts
Threading for outer diameter capability to accept a key insert is available for holes on milled parts and turned. Note that Protolabs does not supply or install the inserts. The diameter for key insert-capable threads are only available for soft metals such as aluminum, brass, and copper.
| Threads | Minimum modeled diameter (in.) | Maximum modeled diameter (in.) | 75% hole drill size (in.) | Maximum thread depth (in.) |
|---|---|---|---|---|
| #8-32 | 0.133 | 0.137 | 0.135 | 0.400 |
| 5/16-18 | 0.271 | 0.276 | 0.274 | 0.650 |
| 3/8-16 | 0.331 | 0.336 | 0.334 | 1.000 |
| 7/16-14 | 0.396 | 0.401 | 0.399 | 1.000 |
| 1/2-13 | 0.452 | 0.457 | 0.455 | 1.000 |
Note: Any countersinks required by the specification for the insert you plan to use should be in the CAD model. Thread size shown is the external thread of the key insert.
| Threads | Minimum modeled diameter (in.) | Maximum modeled diameter (in.) | 75% Hole Drill Size (in.) | Maximum thread depth (in.) |
|---|---|---|---|---|
| #10-32 | 0.160 | 0.164 | 0.162 | 0.600 |
| #12-28 | 0.186 | 0.191 | 0.189 | 0.600 |
| 1/4-28 | 0.227 | 0.231 | 0.229 | 0.650 |
Note: Any countersinks required by the specification for the insert you plan to use should be in the CAD model. Thread size shown is the external thread of the key insert.