It is an ISO 1832 code. D = Shape: 55° rhombic; C = Clearance angle: 7° (positive insert); M = Tolerance class: Class M; T = Hole and chipbreaker: Hole countersunk on one side, chipbreaker on one face.

Which DCMT sizes do you make?

8 sizes, from DCMT070202 to DCMT150408, with inscribed circles from 6.35 to 12.7 mm. Grade, coating and chipbreaker are confirmed with each quotation.

How do I read DCMT11T308?

DCMT = format; 11 = Cutting edge length code (about 11 mm); T3 = Thickness (3.97 mm); 08 = Corner (0.8 mm nominal).

ISO insert format

DCMT inserts

55° rhombic turning insert. We make 8 DCMT sizes, from DCMT070202 to DCMT150408. Grade, coating and chipbreaker are matched to your material and operation.

Ask for a quotation See all sizes

Illustration drawn from the designation, not to scale. Colour depends on the coating.

Reading the code

What DCMT means

The first four letters of an ISO 1832 designation give the shape, the clearance angle, the tolerance class, and the hole and chipbreaker.

Code	Feature	Meaning
D	Shape	55° rhombic
C	Clearance angle	7° (positive insert)
M	Tolerance class	Class M
T	Hole and chipbreaker	Hole countersunk on one side, chipbreaker on one face

Where DCMT inserts are used

The 55° corner reaches into profiles, tapers and recesses that an 80° corner cannot, but the corner is weaker; use it where the contour needs that clearance.

DCMT is a positive (7° clearance) 55° rhombic turning insert. It has a countersunk hole for a clamping screw. The chipbreaker is on one face only. Positive inserts cut with lower forces, which suits finishing, small diameters, internal turning and less rigid setups.

Choose the size for your depth of cut, the corner radius for the feed and finish, and a holder made for DCMT inserts of that size.

DCMT sizes we make

Designation	Inscribed circle	Thickness	Corner
DCMT070202	6.35 mm	2.38 mm	0.2 mm
DCMT070204	6.35 mm	2.38 mm	0.4 mm
DCMT070208	6.35 mm	2.38 mm	0.8 mm
DCMT11T302	9.525 mm	3.97 mm	0.2 mm
DCMT11T304	9.525 mm	3.97 mm	0.4 mm
DCMT11T308	9.525 mm	3.97 mm	0.8 mm
DCMT11T312	9.525 mm	3.97 mm	1.2 mm
DCMT150408	12.7 mm	4.76 mm	0.8 mm

Dimensions shown are nominal values; a dash means the dimension has not been verified for this insert. Confirm the dimensions against the product drawing. The detailed chipbreaker geometry, grade and coating are not specified by the four-letter format; we confirm them with the quotation. Confirm the fit with the pocket and clamping system of your holder or cutter.

Questions

What does DCMT mean?: It is an ISO 1832 code. D = Shape: 55° rhombic; C = Clearance angle: 7° (positive insert); M = Tolerance class: Class M; T = Hole and chipbreaker: Hole countersunk on one side, chipbreaker on one face.
Which DCMT sizes do you make?: 8 sizes, from DCMT070202 to DCMT150408, with inscribed circles from 6.35 to 12.7 mm. Grade, coating and chipbreaker are confirmed with each quotation.
How do I read DCMT11T308?: DCMT = format; 11 = Cutting edge length code (about 11 mm); T3 = Thickness (3.97 mm); 08 = Corner (0.8 mm nominal).

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DCMT inserts

Where DCMT inserts are used

DCMT sizes we make

Questions

Related formats

Start with the details you already have.