Threading: Coil Inserts
Coil insert threading is available for UNC, UNF, and metric threads on both milled and turned parts. The diameter for insert-capable threads and hardware installation (with drawing) are only available on plastics and soft metals such as aluminum, brass, and copper. Note that Protolabs will only install stocked, standard inserts & hardware when a technical drawing is uploaded.
| UNC threads | Minimum modeled diameter (in.) | Maximum modeled diameter (in.) | Maximum thread depth (in.)* |
|---|---|---|---|
| #2-56 | 0.090 | 0.096 | 0.300 |
| #3-48 | 0.105 | 0.110 | 0.400 |
| #4-40 | 0.117 | 0.125 | 0.400 |
| #5-40 | 0.131 | 0.137 | 0.400 |
| #6-32 | 0.145 | 0.153 | 0.600 |
| #8-32 | 0.171 | 0.178 | 0.600 |
| #10-24 | 0.199 | 0.208 | 0.650 |
| #12-24 | 0.225 | 0.234 | 0.650 |
| 1/4-20 | 0.261 | 0.270 | 0.650 |
| 5/16-18 | 0.324 | 0.334 | 1.000 |
| 3/8-16 | 0.389 | 0.399 | 1.200 |
| 7/16-14 | 0.453 | 0.464 | 1.200 |
| 1/2-13 | 0.515 | 0.531 | 1.200 |
*Obstruction by other features of your part, lead-in treatments, or fixturing requirements may reduce the maximum depth of threads.
| UNF threads | Minimum modeled diameter (in.) | Maximum modeled diameter (in.) | >Maximum thread depth (in.)* |
|---|---|---|---|
| #2-64 | 0.090 | 0.095 | 0.300 |
| #3-56 | 0.103 | 0.104 | 0.300 |
| #4-48 | 0.117 | 0.123 | 0.400 |
| #6-40 | 0.144 | 0.150 | 0.600 |
| #8-36 | 0.170 | 0.177 | 0.600 |
| #10-32 | 0.197 | 0.204 | 0.650 |
| 1/4-28 | 0.258 | 0.265 | 0.650 |
| 5/16-24 | 0.322 | 0.329 | 1.000 |
| 3/8-24 | 0.384 | 0.391 | 1.000 |
| 7/16-20 | 0.448 | 0.456 | 1.200 |
| 1/2-20 | 0.511 | 0.519 | 1.200 |
*Obstruction by other features of your part, lead-in treatments, or fixturing requirements may reduce the maximum depth of threads.
| Metric threads | Minimum modeled diameter (mm) | Maximum modeled diameter (mm) | Maximum thread depth (mm)* |
|---|---|---|---|
| M2 x 0.4 | 2.09 | 2.14 | 5.08 |
| M2.5 x 0.45 | 2.55 | 2.65 | 7.62 |
| M3 x 0.5 | 3.11 | 3.25 | 10.16 |
| M3.5 x 0.6 | 3.68 | 3.79 | 15.24 |
| M4 x 0.7 | 4.15 | 4.33 | 15.24 |
| M5 x 0.8 | 5.17 | 5.37 | 16.51 |
| M6 x 1.0 | 6.22 | 6.41 | 16.51 |
| M7 x 1.0 | 7.217 | 7.407 | 18.20 |
| M8 x 1.25 | 8.27 | 8.48 | 25.40 |
| M10 x 1.5 | 10.33 | 10.56 | 30.48 |
| M12 x 1.75 | 12.38 | 12.64 | 30.48 |
| M14 x 2.0 | 16.65 | 17.35 | 35.56 |
| M16 x 2.0 | 18.9 | 19.6 | 40.64 |
| M18 x 2.5 | 21.3 | 22 | 45.72 |
| M20 x 2.5 | 23.55 | 24.4 | 50.8 |
*Obstruction by other features of your part, lead-in treatments, or fixturing requirements may reduce the maximum depth of threads.
** Threads in blue are available through advanced options and require a 2D drawing at time of upload. These advanced options could add additional time for our team of engineers to review your quote.
