MMT STANDARD OF DEPTH OF CUT INTERNAL (RADIAL INFEED)

y ISOMetric(mm)
PitchTotalNumberof PassesInsert Type
(mm)CuttingMlt ith
Depth1 23 45678 910111213 14G-class ground inserts-cass 3-D chinsers w pbreakers
0.50.290.09 0.070.07 0.06MMT11IR050ISOMMT16IR050ISO––
0.750.430.15 0.130.09 0.06MMT11IR075ISOMMT16IR075ISO––
1.00.580.17 0.150.11 0.090.06MMT11IR100ISOMMT16IR100ISOMMT11IR100ISO-SMMT16IR100ISO-S
1.250.720.18 0.160.12 0.110.090.06MMT11IR125ISOMMT16IR125ISOMMT11IR125ISO-SMMT16IR125ISO-S
1.50.870.21 0.200.16 0.130.110.06MMT11IR150ISOMMT16IR150ISOMMT11IR150ISO-SMMT16IR150ISO-S
1.751.010.21 0.200.15 0.120.100.090.080.06MMT11IR175ISOMMT16IR175ISO–MMT16IR175ISO-S
2.01.150.24 0.220.18 0.140.120.100.090.06MMT11IR200ISOMMT16IR200ISO–MMT16IR200ISO-S
2.51.440.25 0.240.21 0.150.130.120.100.09 0.090.06–MMT16IR250ISO–MMT16IR250ISO-S
3.01.730.26 0.250.22 0.170.140.130.120.11 0.100.090.080.06–MMT16IR300ISO–MMT16IR300ISO-S
3.52.020.32 0.300.23 0.190.170.150.140.13 0.120.110.100.06–MMT22IR350ISO––
4.02.310.33 0.310.24 0.220.180.150.140.13 0.120.120.110.100.10 0.06–MMT22IR400ISO––
4.52.600.36 0.330.28 0.240.210.190.160.15 0.140.130.120.120.11 0.06–MMT22IR450ISO––
5.02.890.41 0.380.32 0.270.240.210.180.16 0.150.140.130.120.12 0.06–MMT22IR500ISO––

yAmerican UN (inch)

Pitch (thread/Total CuttingNumber of PassesInsert Type
inch)Depth123456789101112 13 14G-class ground insertsM-class inserts with 3-D chipbreakers
32.018.006 .006.004.002MMT11IR320UNMMT16IR320UN–
28.020.006 .005.004.003.002MMT11IR280UNMMT16IR280UN–
24.024.007 .006.005.004.002MMT11IR240UNMMT16IR240UN–
20.029.007 .006.005.005.004.002MMT11IR200UNMMT16IR200UN–
18.032.008 .007.006.005.004.002MMT11IR180UNMMT16IR180UN–
16.036.008 .007.006.005.004.004.002MMT11IR160UNMMT16IR160UNMMT16IR160UN-S
14.041.008 .007.006.005.005.004.004.002MMT11IR140UNMMT16IR140UNMMT16IR140UN-S
13.044.009 .007.006.006.005.005.004.002–MMT16IR130UN–
12.048.009 .009.007.006.005.005.005.002–MMT16IR120UNMMT16IR120UN-S
11.052.009 .009.008.006.005.005.004.004.002–MMT16IR110UN–
10.058.010 .009.008.006.005.005.005.004.004.002–MMT16IR100UN–
9.064.012 .009.008.007.006.006.005.005.004.002–MMT16IR090UN–
8.072.012 .010.008.007.006.006.006.005.005.005 .002–MMT16IR080UN–
7.082.014 .012.009.008.007.007.006.006.006.005 .002–MMT22IR070UN–
6.096.016 .013.010.009.007.007.006.006.006.005 .005.004 .002–MMT22IR060UN–
5.115.016 .014.012.010.009.008.008.007.007.006 .006.005 .005 .002–MMT22IR050UN–

yWhitworth for BSW, BSP (inch)

Pitch (thread/Total CuttingNumber of PassesInsert TypeMl it ith
inch)Depth12345678910 1112 13 14G-class ground inserts-cass nsers w 3-D chipbreakers
28.023.007.006.004.004.002–MMT16IR280W–
26.025.007.006.005.005.002–MMT16IR260W–
20.032.008.007.006.005.004.002–MMT16IR200W–
19.034.008.007.006.006.005.002MMT11IR190WMMT16IR190WMMT16IR190W-S
18.035.010.007.006.005.005.002–MMT16IR180W–
16.040.008.007.006.005.004.004.004.002–MMT16IR160W–
14.046.009.008.007.006.005.005.004.002MMT11IR140WMMT16IR140WMMT16IR140W-S
12.054.011.010.008.006.006.006.005.002–MMT16IR120WMMT16IR120W-S
11.058.011.009.008.007.006.006.005.004.002–MMT16IR110W–
10.064.011.010.008.007.006.006.005.005.004.002–MMT16IR100W–
9.071.011.010.008.007.006.006.006.005.005.005 .002–MMT16IR090W–
8.080.012.011.009.007.007.006.006.006.005.005 .004.002–MMT16IR080W–
7.091.013.013.010.009.008.007.007.006.006.006 .004.002–MMT22IR070W–
6.107.014.013.011.009.008.008.007.007.006.006 .006.005 .005 .002–MMT22IR060W–
5.128.017.016.014.011.010.009.009.008.007.007 .007.006 .005 .002–MMT22IR050W–

Note 1) Set the finishing allowance on a diameter at approx. .004 inch when using a full form insert.

  • Please note the cutting depth and the number of passes when a nose radius of a partial or semi-full form insert or of an internal threading insert is small to prevent damage to the insert nose.
  • Please set the cutting depth sufficiently deep enough on materials such as hardened steel or austenitic stainless steel to help prevent premature wear and chipping caused by the outer layer of the material. G017