The following info is supplied by Vortech, although it does not seem to be available on their web site, it is printed on the back of a Vortech spinners package.
| Engine Manuf. | Engine size | Crankshaft thread |
| Como | .19 - .61 | Imp 1/4 - 28 |
| .75 - .90 | Imp 5/16 - 24 | |
| Enya | .15 - .25 | M6 (6.0 x 1.0mm) |
| .25 - .53 | Imp 1/4 - 28 | |
|
.35 - .60, .60 - 1.2 4-Stroke (non R engines) |
7.0 x 1.0mm | |
| 1.2R 4-Stroke | 8.0 x 1.0mm | |
| Fox | .19 - .50 | Imp 1/4 - 28 |
| .60 - 1.20 | Imp 5/16 - 24 | |
| HP | .21 - .61 | Imp 1/4 - 28 |
| 1.20 4-Stroke | Imp 5/16 - 24 (or 8.0 x 1.0mm - conflicting data) | |
| Irvine | .20 - .61 | Imp 1/4 - 28 |
| K&B | .16 - .65 | Imp 1/4 - 28 |
| OPS | .40 - .60 | Imp 1/4 - 28 |
| Maxi .30 | M8 (8.0 x 1.25mm) | |
| Super .60, .61 5-port | 8.0 x 1.0mm | |
| .65 | M6 (6.0 x 1.0mm) | |
| OS | .25 - .60 | Imp 1/4 - 28 |
| .61 - .90 | Imp 5/16 - 24 | |
| Peco | .21 - .45 | Imp 1/4 - 28 |
| .60 - .80 | M8 (8.0 x 1.25mm) | |
| Rossi | .40 - .61 | M8 (8.0 x 1.25mm) |
| Saito | .30 - .45 | M6 (6.0 x 1.0mm) |
| ST | .25 - .60 | Imp 1/4 - 28 |
| .61 - .90 | Imp 5/16 - 24 | |
| Webra | .28 - .80 | Imp 1/4 - 28 |
| .61 - 1.20 | M8 (8.0 x 1.25mm) | |
| YS | All 2-Stroke | M8 (8.0 x 1.25mm) |
| .90 - 1.20 4-Stroke | 8.0 x 1.0mm |
Unless states otherwise, all engines are 2-strokes.
