MMT STANDARD OF DEPTH OF CUT EXTERNAL (RADIAL INFEED)

yAPI Round Casing & Tubing

(inch)

PitchTotalNumber of PassesInsert Type
(thread/ Cutting
inch)Depth6 5 4 3 2 1 712 11 10 9 8 G-class ground inserts
10 .056 .010 .009 .006 .006 .005 .005 .005 .004 .004 .002MMT16ER100APRD
8 .071 .010 .009 .007 .006 .006 .006 .005 .005 .005 .005 .005 .002MMT16ER080APRD
yAmerican NPT(inch)
PitchTotalNumber of PassesInsert Type
(thread/ Cutting
inch)Depth6 5 4 3 2 1 715 14 13 12 11 10 9 8 G-class ground inserts
27.026 .006 .005 .005 .004 .004 .002MMT16ER270NPT
18.040 .008 .006 .006 .005 .005 .004 .004 .002MMT16ER180NPT
14.052 .009 .007 .006 .006 .005 .005 .004 .004 .004 .002MMT16ER140NPT
11.5 .065 .009 .007 .007 .006 .006 .005 .005 .005 .005 .004 .004 .002MMT16ER115NPT
8.095 .013 .011 .009 .008 .007 .006 .006 .006 .005 .005 .005 .004 .004 .004 .002MMT16ER080NPT
yAmerican NPTF
(inch)
PitchTotalNumber of PassesInsert Type
(thread/ Cutting
inch)Depth6 5 4 3 2 1 715 14 13 12 11 10 9 8 G-class ground inserts
27.025 .006 .006 .004 .004 .003 .002MMT16ER270NPTF
18.039 .007 .006 .006 .005 .005 .004 .004 .002MMT16ER180NPTF
14.053 .009 .008 .006 .006 .005 .005 .004 .004 .004 .002MMT16ER140NPTF
11.5 .064 .009 .009 .007 .006 .005 .005 .005 .004 .004 .004 .004 .002MMT16ER115NPTF
8.094 .013 .011 .009 .007 .007 .006 .006 .006 .005 .005 .005 .004 .004 .004 .002MMT16ER080NPTF

G 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.