 BACK |
- Product Guide
- Turning Tools
- Threading
- MMT series
- Features of MMT Series
FEATURES OF MMT SERIES
A WIDE VARIETY OF PRODUCTS
Mitsubishi Miracle Threading (MMT) series. 297 inserts and 26 holders.
Mitsubishi Miracle Threading (MMT) series. 297 inserts and 26 holders.
M-CLASS INSERTS WITH 3-D CHIP BREAKERS
G-CLASS GROUND INSERTS
IDEAL CHIP CONTROL EVEN IN THE LATTER HALF OF PASSES WHEN CONTINUOUS CHIPS ARE USUALLY PRODUCED. (M-CLASS INSERTS WITH 3-D CHIP BREAKERS)
ISO metric external thread pitch 1.5mm Final pass (6th pass)
A HIGHER LEVEL OF PRECISION THAN CONVENTIONAL INSERTS (G-CLASS GROUND INSERTS)
High precision threading can be achieved by using MMT inserts that feature a ground rake face and peripheral cutting edge.
| Thread Type | Threading Tolerance |
|---|---|
| ISO Metric | 6g/6H |
| American UN | 2A/2B |
| Whitworth for BSW, BSP | Medium Class A |
| BSPT | Standard BSPT |
| Round DIN 405 | 7h/7H |
| ISO Trapezoidal 30° | 7e/7H |
| American ACME | 3G |
| UNJ | 3A/3B |
| API Buttress Casing | Standard API |
| API Rounded Casing & Tubing | Standard API RD |
| American NPT | Standard NPT |
| American NPTF | Class2 |
HOLDER (Use of special surface treatment)
External
Internal
SUITABLE FOR THREADING WITH A LARGE LEAD ANGLE
By changing only the shim, MMT holders can be used for turning of threads with various lead angles as well as the turning of left hand threads. (Please refer to page G038 and page G041)
| Lead Angle | Inclination Angle |
|---|---|
| -1.5° | -3° |
| -0.5° | -2° |
| 0.5° | -1° |
| 1.5° | 0° |
| 2.5° | 1° |
| 3.5° | 2° |
| 4.5° | 3° |
Standerd shim celiverd with the holder 
(G-class ground inserts only)
Superior wear and plastic deformation resistance
- High wear and plastic deformation resistance for threading when maintaining the thread form is important. Suitable for continuous high precision machining with extensive tool life.
- Effective in combination with G-class inserts for high precision threading.
(G-class ground inserts, M-class inserts with 3-D chip breakers)
Wide versatility
- High fracture resistance during low rigidity applications such as bar feed machining. Able to withstand harsh conditions for long periods where conventional inserts would be liable to breakage.
- Effective combination of high cost performance M-class inserts with 3-D chip breakers.
(G-class ground inserts, M-class inserts with 3-D chip breakers)
Excellent fracture resistance
- Suitable for stainless steel boring and unstable machining where inserts are vulnerable to fracturing.
- Effective combination of high cost performance M-class inserts with 3-D chip breakers.
CHOOSING M-CLASS INSERTS WITH 3-D CHIP BREAKERS OR G-CLASS INSERTS
| Insert | Chip control | Precision of thread |
|---|---|---|
| M-class inserts with 3-D chip breakers  |
 |
 |
| Insert | Chip control | Precision of thread |
|---|---|---|
G-class inserts |
|
|
- For ideal chip control and a high cost performance ratio, M-class inserts with 3-D chip breakers are recommended.
- G-class inserts are recommended where higher precision is required.
