It is an ISO 1832 code. C = Shape: 80° rhombic; N = Clearance angle: 0° (negative insert); G = Tolerance class: Class G; G = Hole and chipbreaker: Cylindrical hole, chipbreaker on both faces.

Which CNGG sizes do you make?

5 sizes, from CNGG120400 to CNGG120408, all with a 12.7 mm inscribed circle. Grade, coating and chipbreaker are confirmed with each quotation.

How do I read CNGG120408?

CNGG = format; 12 = Cutting edge length code (about 12 mm); 04 = Thickness (4.76 mm); 08 = Corner (0.8 mm nominal).

ISO insert format

CNGG inserts

80° rhombic turning insert. We make 5 CNGG sizes, from CNGG120400 to CNGG120408. 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 CNGG 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
C	Shape	80° rhombic
N	Clearance angle	0° (negative insert)
G	Tolerance class	Class G
G	Hole and chipbreaker	Cylindrical hole, chipbreaker on both faces

Where CNGG inserts are used

The 80° corner is strong and covers most turning and facing work, so C inserts are the usual first choice for general turning.

CNGG is a negative 80° rhombic turning insert. It has a cylindrical hole. It has a chipbreaker on both faces. It can be turned over, so both faces are used: twice the corners of a one-sided insert. Negative inserts have a strong edge and are used from finishing to roughing on rigid machines. Tolerance class G is tighter than class M; inserts in this class are often ground, for more precise dimensions.

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

CNGG sizes we make

Designation	Inscribed circle	Thickness	Corner
CNGG120400	12.7 mm	4.76 mm	Sharp
CNGG120401	12.7 mm	4.76 mm	0.1 mm
CNGG120402	12.7 mm	4.76 mm	0.2 mm
CNGG120404	12.7 mm	4.76 mm	0.4 mm
CNGG120408	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 CNGG mean?: It is an ISO 1832 code. C = Shape: 80° rhombic; N = Clearance angle: 0° (negative insert); G = Tolerance class: Class G; G = Hole and chipbreaker: Cylindrical hole, chipbreaker on both faces.
Which CNGG sizes do you make?: 5 sizes, from CNGG120400 to CNGG120408, all with a 12.7 mm inscribed circle. Grade, coating and chipbreaker are confirmed with each quotation.
How do I read CNGG120408?: CNGG = format; 12 = Cutting edge length code (about 12 mm); 04 = Thickness (4.76 mm); 08 = Corner (0.8 mm nominal).

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CNGG inserts

Where CNGG inserts are used

CNGG sizes we make

Questions

Related formats

Start with the details you already have.