It is an ISO 1832 code. T = Shape: 60° triangular; P = Clearance angle: 11° (positive insert); M = Tolerance class: Class M; T = Hole and chipbreaker: Hole countersunk on one side, chipbreaker on one face.

Which TPMT sizes do you make?

4 sizes, from TPMT090204 to TPMT16T308, with inscribed circles from 5.56 to 9.525 mm. Grade, coating and chipbreaker are confirmed with each quotation.

How do I read TPMT110308?

TPMT = format; 11 = Cutting edge length code (about 11 mm); 03 = Thickness (3.18 mm); 08 = Corner (0.8 mm nominal).

ISO insert format

TPMT inserts

60° triangular turning insert. We make 4 TPMT sizes, from TPMT090204 to TPMT16T308. 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 TPMT 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
T	Shape	60° triangular
P	Clearance angle	11° (positive insert)
M	Tolerance class	Class M
T	Hole and chipbreaker	Hole countersunk on one side, chipbreaker on one face

Where TPMT inserts are used

The 60° triangle has three corners per face and a long cutting edge for its size: a compromise between corner strength and access.

TPMT is a positive (11° clearance) 60° triangular 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 TPMT inserts of that size.

TPMT sizes we make

Designation	Inscribed circle	Thickness	Corner
TPMT090204	5.56 mm	2.38 mm	0.4 mm
TPMT110304	6.35 mm	3.18 mm	0.4 mm
TPMT110308	6.35 mm	3.18 mm	0.8 mm
TPMT16T308	9.525 mm	3.97 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 TPMT mean?: It is an ISO 1832 code. T = Shape: 60° triangular; P = Clearance angle: 11° (positive insert); M = Tolerance class: Class M; T = Hole and chipbreaker: Hole countersunk on one side, chipbreaker on one face.
Which TPMT sizes do you make?: 4 sizes, from TPMT090204 to TPMT16T308, with inscribed circles from 5.56 to 9.525 mm. Grade, coating and chipbreaker are confirmed with each quotation.
How do I read TPMT110308?: TPMT = format; 11 = Cutting edge length code (about 11 mm); 03 = Thickness (3.18 mm); 08 = Corner (0.8 mm nominal).

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TPMT inserts

Where TPMT inserts are used

TPMT sizes we make

Questions

Related formats

Start with the details you already have.