What are the dimensions of CNMG190604?

CNMG190604 has an inscribed circle (d1) of 19.05 mm (0.75 in), thickness s of 6.35 mm (0.25 in) and nose corner radius rε of 0.4 mm (0.016 in), per the ISO 1832 designation.

What does the CNMG190604 designation mean?

CNMG = 80° rhombic; 0° clearance; medium tolerance; Fixing hole, integral chipbreakers on both faces (double-sided insert).

Is CNMG190604 interchangeable between brands?

Yes for geometry: under ISO 1832 every CNMG190604 from any manufacturer shares shape, inscribed circle, thickness and nose radius. Brand suffixes after the core code (chipbreaker designs such as -PM or -PR, and grade numbers) change chip control and application, not geometry, so confirm the full ordering code and grade before substituting.

Which carbide grade should I use with CNMG190604?

The ISO core code defines geometry only. The grade is selected for the workpiece material (ISO 513 groups P/M/K/N/S/H) and the operation: CVD grades for general steel and cast-iron turning, PVD grades for stainless, superalloys and finishing. Verified, catalog-cited grade equivalents for this model appear in the grade cross-reference table as they are added.

What is CNMG190604 typically used for?

Typical operations: turning, facing, boring, double-sided (more edges per insert). Large inscribed circle — roughing and high-feed operations on rigid setups.

CNMG190604 Insert: Dimensions, Grades & Cross References

The CNMG190604 is an ISO 1832 indexable turning insert: an 80° rhombic (C), 0° clearance, chipbreakers on both faces (double-sided), with inscribed circle d1 19.05 mm (0.75 in), thickness s 6.35 mm and 0.4 mm nose radius rε. Verify the full ordering code against the manufacturer catalogue before ordering.

Geometry deterministically derived from ISO 1832 Brand catalogue data cited per row

Request a quote / verification for CNMG190604 →

Verified specification and original + equivalent grade options — reply within one business day.

Top-view schematic, not to scale. d1 = inscribed circle, rε = nose corner radius.

Key dimensions

Inscribed circle d1: 19.05 mm (0.75 in)
Thickness s: 6.35 mm (0.25 in)
Nose radius rε: 0.4 mm (0.016 in)

Inserts with the same d1 × s × rε set → All 19.05 mm inscribed-circle inserts →

ISO 1832 designation decoded

Position	Meaning	Value	Explanation
1	Insert shape	C — Rhombic (diamond) insert, 80° included angle	Shape family: rhombic, 80°.
2	Clearance angle	N — 0°	0° clearance (negative insert, usable on both sides)
3	Tolerance class	M	Medium tolerance class (as-sintered moulded insert, general turning)
4	Fixing / chipbreaker	G	Fixing hole, integral chipbreakers on both faces (double-sided insert)
5	Cutting edge length / IC (d1)	19	19 — IC 19.05 mm (0.75 in)
6	Insert thickness (s)	06	06 — 6.35 mm (0.25 in)
7	Nose corner radius (rε)	04	04 — 0.4 mm (0.016 in)
8	Cutting direction	—	Hand omitted — neutral / either-hand per catalogue.

Specification table

ISO designation	CNMG190604
Insert shape	Rhombic (diamond) insert, 80° included angle
Clearance angle	0° — 0° clearance (negative insert, usable on both sides)
Tolerance class	M — Medium tolerance class (as-sintered moulded insert, general turning)
Fixing / chipbreaker	G — Fixing hole, integral chipbreakers on both faces (double-sided insert)
Inscribed circle d1	19.05 mm (0.75 in)
Thickness s	6.35 mm (0.25 in)
Nose corner radius rε	0.4 mm (0.016 in)
Cutting direction	Neutral / hand omitted
Designation standard	ISO 1832, indexable insert designation for turning and copying tools

Source: ISO 1832 designation standard (geometry positions 1–8). Brand-specific rows below cite their manufacturer catalogue individually.

Cross-brand geometric interchange

Under ISO 1832, every insert carrying the core designation CNMG190604 shares identical geometry — shape, inscribed circle, thickness and nose radius — regardless of manufacturer. Letters after a dash (chipbreaker patterns, grade numbers) affect chip control and application band, not the pocket geometry, and are marked PARTIAL.

Korloy — 4 catalogued ordering codes

Equivalent designation	Match	Note
CNMG190604-B25 NC3030 ANSI: CNMG641-B25	FULL	B25 Official catalogue ↗ · accessed 2026-10-02
CNMG190604-B25 NC3120 ANSI: CNMG641-B25	FULL	B25 Official catalogue ↗ · accessed 2026-10-02
CNMG190604-B25 NC3215 ANSI: CNMG641-B25	FULL	B25 Official catalogue ↗ · accessed 2026-10-02
CNMG190604-B25 NC5330 ANSI: CNMG641-B25	FULL	B25 Official catalogue ↗ · accessed 2026-10-02

Match levels: FULL = same geometry and equivalent grade · PARTIAL = geometry matches, chipbreaker/grade differs · VERIFY = commonly quoted, confirm against the target catalogue.

Grade cross-reference (ISO 513)

Geometry swaps are safe; grade swaps need review. Grades are mapped only within the same ISO 513 workpiece group and application band, and every mapping is cited. Verified catalog mappings for this geometry are added row by row.

Grades catalogued for CNMG190604

Korloy — 4 grade offerings

Grade	Chipbreaker	ISO 513	Coating	Operation	Source
NC3030	B25	—	CVD	—	Catalogue ↗ (2026-10-02)
NC3120	B25	—	CVD	—	Catalogue ↗ (2026-10-02)
NC3215	B25	—	CVD	—	Catalogue ↗ (2026-10-02)
NC5330	B25	—	CVD	—	Catalogue ↗ (2026-10-02)

These are the manufacturers' own grade offerings for this geometry, each linked to its grade record.

Cross-brand grade equivalents

Equivalent grade	Brand	Match	ISO 513	Coating	Basis / note	Source
1515	Sandvik Coromant	PARTIAL	M / P	CVD	CVD steel P30 / stainless M; same P+M dual-group coverage.	TaeguTec — Grade Comparison Table (turning grades across 12 manufacturers) (2026-09-28)
4335	Sandvik Coromant	PARTIAL	K / M / P	CVD	CVD steel P25 medium; equivalent in comparison chart.	TaeguTec — Grade Comparison Table (turning grades across 12 manufacturers) (2026-09-28)
4315	Sandvik Coromant	PARTIAL	K / P	CVD	CVD steel P10 continuous; listed equivalent in comparison.	TaeguTec — Grade Comparison Table (turning grades across 12 manufacturers) (2026-09-28)

Match levels: FULL = same ISO 513 group, application band and coating family · PARTIAL = same band, different coating or edge prep · VERIFY = quoted in aftermarket charts, unconfirmed by both catalogues.

Applications & cutting conditions

Typical operations

turning
facing
boring
double-sided (more edges per insert)

Large inscribed circle — roughing and high-feed operations on rigid setups.

Workpiece materials

All ISO 513 workpiece material groups (P/M/K/N/S/H) depending on the selected carbide grade.

CVD-coated grades are typical for steel (P) and cast iron (K) general turning; PVD-coated grades are typical for stainless (M), superalloys (S) and finishing cuts. Always apply the manufacturer's cutting-data recommendation for the chosen grade.

Selection notes

▸Geometry first, grade second. The same ISO core code is a drop-in pocket fit across brands; the chipbreaker suffix and grade decide performance and must be matched to the cut.
▸Nose radius is a trade-off. A larger rε strengthens the edge and allows higher feeds but raises radial cutting forces and vibration risk; smaller radii suit finishing, fine detail and slender setups.
▸Match clearance to the holder. Positive-clearance codes (B/C/P…) require the matching positive toolholder; 0° N inserts seat on negative holders and offer twice the edges.
▸Tolerance class for the job. G and tighter classes suit precision and finishing; M-class moulded inserts are the economical default for general turning.
▸Pick the chipbreaker for your feed band. Roughing and finishing geometries are not interchangeable in practice even when the core code is identical.
▸Toughness vs wear resistance. Tough grades resist interrupted cuts and scale; hard, wear-resistant grades suit stable, high-speed finishing — choose within the same ISO 513 group.

Frequently asked questions

Need verified specs or sourcing for CNMG190604?

Send the ISO code (or a brand ordering number) and your workpiece material. We reply within one business day with the verified specification and original + equivalent grade options — no obligation.

Reviewed & sources. Geometry per the ISO 1832 designation standard; brand-specific specifications cite the manufacturer catalogue shown on each row with version and extraction date. InsertBase is independent and is not an authorised distributor. Values must be verified against the current manufacturer catalogue before ordering. See the editorial & correction policy.