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- MMT series
- Selecting The Shim for MMT Series
 SELECTING THE SHIM FOR MMT SERIES |
| A FLANK ANGLE AND LEAD ANGLE |
| Lead angle (a) depends on a combination of thread diameter and pitch. Select a shim so that the lead angle of the thread can coincide with the flank angles of the thread and insert (ß1,ß2). No need to change a shim in general threading with MMT Holder. When threading with small diameter or large pitch, change a shim depending on lead angle, referring to the below table and graph. When threading left hand threads, change to a shim with a negative inclination angle. |  |
| SHIM REFERENCE TABLE (THREADING DIAMETER) |
 |
Right Hand Thread (mm) | |||||
|---|---|---|---|---|---|---|
| Threading impossible |
4.5° | 3.5° | 2.5° | 1.5° | 0.5° | |
| 0.5 |  ø 1.9 |
ø 1.9 -ø 2.2 | ø 2.2 - ø 2.8 |
ø 2.8 - ø 4.3 | ø 4.3 - ø 11.4 |  ø 11.4 |
| 0.75 | ø 2.9 |
ø 2.9 -ø 3.2 | ø 3.2 - ø 4.6 | ø 4.6 - ø 6.5 | ø 6.5 - ø 17.1 | ø 17.1 |
| 1 | ø 3.8 |
ø 3.8 -ø 4.3 | ø 4.3 - ø 5.7 | ø 5.7 - ø 8.7 | ø 8.7 - ø 22.8 | ø 22.8 |
| 1.25 | ø 4.8 |
ø 4.8 -ø 5.4 | ø 5.4 - ø 7.1 | ø 7.1 - ø 10.9 | ø 10.9 - ø 28.5 | ø 28.5 |
| 1.5 | ø 5.7 |
ø 5.7 -ø 6.5 | ø 6.5 - ø 8.5 | ø 8.5 - ø 13.0 | ø 13.0 - ø 34.2 | ø 34.2 |
| 1.5 | ø 6.7 |
ø 6.7 -ø 7.6 | ø 7.6 - ø 9.9 | ø 9.9 - ø 15.2 | ø 15.2 - ø 39.9 | ø 39.9 |
| 2 | ø 7.6 |
ø 7.6 -ø 8.6 | ø 8.6 - ø 11.4 | ø 11.4 - ø 17.4 | ø 17.4 - ø 45.6 | ø 45.6 |
| 2.5 | ø 9.5 |
ø 9.5 -ø 10.8 | ø 10.8 - ø 14.2 | ø 14.2 - ø 21.7 | ø 21.7 - ø 57.0 | ø 57.0 |
| 3 | ø 11.4 |
ø 11.4 -ø 13.0 | ø 13.0 - ø 17.0 | ø 17.0 - ø 26.0 | ø 26.0 - ø 68.4 | ø 68.4 |
| 3.5 | ø 13.3 |
ø 13.3 -ø 15.1 | ø 15.1 - ø 19.9 | ø 19.9 - ø 30.4 | ø 30.4 - ø 79.8 | ø 79.8 |
| 4 | ø 15.2 |
ø 15.2 -ø 17.3 | ø 17.3 - ø 22.7 | ø 22.7 - ø 34.7 | ø 34.7 - ø 91.2 | ø 91.2 |
| 4.5 | ø 17.1 |
ø 17.1 -ø 19.4 | ø 19.4 - ø 25.6 | ø 25.6 - ø 39.1 | ø 39.1 - ø 102.6 | ø 102.6 |
| 5 | ø 19.0 |
ø 19.0 -ø 21.6 | ø 21.6 - ø 28.4 | ø 28.4 - ø 43.4 | ø 43.4 - ø 114.0 | ø 114.0 |
|
Left Hand Thread (mm) | ||
|---|---|---|---|
| Threading impossible |
-1.5° | -0.5° | |
| 0.5 | ø 4.3 |
ø 4.3 -ø 11.4 | ø11.4 |
| 0.75 | ø 6.5 |
ø 6.5 -ø 17.1 | ø 17.1 |
| 1 | ø 8.7 |
ø 8.7 -ø 22.8 | ø 22.8 |
| 1.25 | ø 10.9 |
ø 10.9 -ø 28.5 | ø 28.5 |
| 1.5 | ø 13.0 |
ø 13.0 -ø 34.2 | ø 34.2 |
| 1.5 | ø 15.2 |
ø 15.2 -ø 39.9 | ø 39.9 |
| 2 | ø 17.4 |
ø 17.4 -ø 45.6 | ø 45.6 |
| 2.5 | ø 21.7 |
ø 21.7 -ø 57.0 | ø 57.0 |
| 3 | ø 26.0 |
ø 26.0 -ø 38.4 | ø 38.4 |
| 3.5 | ø 30.4 |
ø 30.4 -ø 79.8 | ø 79.8 |
| 4 | ø 34.7 |
ø 34.7 -ø 91.2 | ø 91.2 |
| 4.5 | ø 39.1 |
ø 39.1 -ø 102.6 | ø 102.6 |
| 5 | ø 43.4 |
ø 43.4 -ø 114.0 | ø 114.0 |
(Note) Back turning in case left hand threads.
