Specification · manufacturer examples available

CNMG 120412

80° rhombic · 0° clearance · CNMG series

Inscribed circle · IC12.7 mm

Thickness · S4.76 mm

Corner radius · R1.2 mm

Compare with CNMG 120408 →View manufacturer examples ↓

Product grade and application depend on the full manufacturer designation. Confirm the holder pocket and clamping before choosing a replacement.

← Browse CNMG specifications

CNMG 120412Nominal geometry

IC 12.7S 4.76R 1.2mm

Cylindrical hole · 2-face chipbreaker in base type. Outer envelope follows nominal IC, thickness and cutting-corner radius. Dashed circles are mounting symbols, not bore dimensions. Chipbreaker, edge preparation, tip construction and coating are not depicted. This is not a product photograph.

Nominal code dimensions

Dimension referenceCode-table source ↗

Swipe to see the full dimension drawing →

Separate scales for the three views. S is measured between the top and bottom reference planes. The side section shows the outer envelope only. Minor corners, bore/countersink dimensions, chipbreaker and edge preparation require the exact manufacturer drawing.

Field	mm	in	Code-table position
Inscribed circle	12.7	0.5000	5 · ISCAR metric table ↗
Thickness	4.76	0.1874	6 · ISCAR metric table ↗
Corner radius	1.2	0.0472	7 · ISCAR metric table ↗

The inch column is mm ÷ 25.4, rounded to four decimal places. This is not an ANSI designation conversion. Product tolerances and clamping dimensions are not inferred.

CNMG 120412 versus CNMG 120408

radius: 0.8 → 1.2 mm. The nominal IC and thickness are unchanged.

Swipe to compare both references →

Nominal code-reference comparison
Property	CNMG 120412	CNMG 120408
Family	CNMG	CNMG
Outline	80° rhombic	80° rhombic
Corner radius	1.2 mm	0.8 mm
Inscribed circle	12.7 mm	12.7 mm
Thickness	4.76 mm	4.76 mm
Corner angle	80 °	80 °
Clearance angle	0 °	0 °
Tolerance symbol	M	M
Configuration symbol	G	G
Evidence	Code table + 1 catalogue examples	Code table + 2 catalogue examples

Where this radius sits

The CNMG 1204 group in this directory has 5 entries, from 0.4 to 2.4 mm radius. This sits between the smallest and largest listed radii.

Confirm the part contour and tool compensation for 1.2 mm. A radius change does not establish surface finish, cutting data or holder compatibility.

Nearby CNMG references

CNMG 120408 → — radius: 1.2 → 0.8 mm. The nominal IC and thickness are unchanged.
CNMG 120416 → — radius: 1.2 → 1.6 mm. The nominal IC and thickness are unchanged.
CNMG 120404 → — radius: 1.2 → 0.4 mm. The nominal IC and thickness are unchanged.

Product evidence for CNMG 120412

ISCAR / catalogue example

CNMG 120412-TF IC20

IC: 12.7 mm
Thickness: 4.76 mm
Radius: 1.2 mm
Grade: IC20

Read the exact catalogue row ↗

Aluminum Machining, PDF page 9 / printed page 7, exact designation row. Exact geometry row and IC20 availability mark in this catalogue. Cutting conditions require the applicable product data; no stock check.

Read shared CNMG configuration and selection limits →Calculate speed or feed after obtaining cutting data →

Documented applications for CNMG 120412

CNMG120412-HRF AH8015

Source image only · representative family image

Tungaloy · case-study

IC / thickness / radius: 12.7 / 4.76 / 1.2 mm
Material scope: superalloy

superalloy / external, internal / finish

Check this complete product and its conditions →

Tungaloy AH8000 applications ↗ · Inconel application examples and external/internal family capability.

Tungaloy metric catalogue 437 ↗ · Printed page 10; exact product row and grade/geometry application matrix.

Named case: Inconel 909, wet. Confirm your alloy and condition. Interrupted-cut evidence is limited to light interruption. Heavy interruption is not established by this record. External/internal operation scope is documented at family level; confirm the actual holder, access and cutting direction. Application evidence is attached to this full product, not every insert sharing the base code.

Source and limits

ISCAR · Metric insert identification ↗ · Single-sheet PDF, sections 1, 2, 4, 5, 6 and 7; visually checked 2026-10-20.

Shape, clearance, configuration and nominal code tables only. No grade, usable-edge count, catalogue availability or acceptance tolerances inferred. Values labeled “code table” are interpretations of a designation, not measurements of a delivered product. Product-row values are reported separately, including differences in printed precision.

See the page-by-page review →