Specification · manufacturer examples available

SNMA 120408

Square · 0° clearance · SNMA series

Inscribed circle · IC12.7 mm

Thickness · S4.76 mm

Corner radius · R0.8 mm

Compare with SNMA 120404 →View manufacturer examples ↓

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

← Browse SNMA specifications

SNMA 120408Nominal geometry

IC 12.7S 4.76R 0.8mm

Cylindrical hole · no 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	0.8	0.0315	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.

SNMA 120408 versus SNMA 120404

radius: 0.4 → 0.8 mm. The nominal IC and thickness are unchanged.

Swipe to compare both references →

Nominal code-reference comparison
Property	SNMA 120408	SNMA 120404
Family	SNMA	SNMA
Outline	Square	Square
Corner radius	0.8 mm	0.4 mm
Inscribed circle	12.7 mm	12.7 mm
Thickness	4.76 mm	4.76 mm
Corner angle	90 °	90 °
Clearance angle	0 °	0 °
Tolerance symbol	M	M
Configuration symbol	A	A
Evidence	Code table + 1 catalogue examples	Code table; product example not documented

Where this radius sits

The SNMA 1204 group in this directory has 4 entries, from 0.4 to 1.6 mm radius. This sits between the smallest and largest listed radii.

Confirm the part contour and tool compensation for 0.8 mm. A radius change does not establish surface finish, cutting data or holder compatibility.

Nearby SNMA references

SNMA 120404 → — radius: 0.8 → 0.4 mm. The nominal IC and thickness are unchanged.
SNMA 120412 → — radius: 0.8 → 1.2 mm. The nominal IC and thickness are unchanged.
SNMA 120416 → — radius: 0.8 → 1.6 mm. The nominal IC and thickness are unchanged.

Product evidence for SNMA 120408

ISCAR / catalogue example

SNMA 120408 IC20

IC: 12.7 mm
Thickness: 4.76 mm
Radius: 0.8 mm
Grade: IC20

Read the exact catalogue row ↗

Aluminum Machining, PDF page 18 / printed page 16, 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 SNMA configuration and selection limits →Calculate speed or feed after obtaining cutting data →

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 →