Type

ISO Designation for Indexable Inserts

Type	Symbol	Shape	Nose angle	Figure
I Equilateral and Equiangular inserts	H	Hexagonal	120⁰
	O	Octogonal	135⁰
	P	Pentagon	108⁰
	S	Square	90⁰
	T	Triangular	60⁰
II Equilateral but non-equiangular inserts	C	Rhombic	80⁰ *
	D		55⁰ *
	E		75⁰ *
	M		86⁰ *
	V		35⁰ *
	W	Trigon	80⁰ *
III Non-equilateral but equiangular inserts	L	Rectangular	90⁰
IV Non-equilateral and non-equiangular inserts	A	Parallelogram	85⁰ *
	B		82⁰ *
	K		55⁰ *
V Round Inserts	R	Round
1. Shape

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Symbol	Relief angle
A	3⁰
B	5⁰
C	7⁰
D	15⁰
E	20⁰
F	25⁰
G	30⁰
N	0⁰
P	11⁰
O	Others

2. Normal clearence

Symbol (class)	Tolerance(mm)
Symbol (class)	Corner point(m)	Thickness (s)	Inscribed circle(d)
A⁺	ą0.005	ą0.025	ą0.025
F⁺	ą0.005	ą0.025	ą0.013
C⁺	ą0.013	ą0.025	ą0.025
H	ą0.013	ą0.025	ą0.013
E	ą0.025	ą0.025	ą0.025
G	ą0.025	ą0.13	ą0.025
J⁺	ą0.005	ą0.025	ą0.05 to 0.15++
K⁺	ą0.013	ą0.025	ą0.05 to 0.15++
L⁺	ą0.025	ą0.025	ą0.05 to 0.15++
M	ą0.08 to 0.20++	ą0.13	ą0.05 to 0.15++
N	ą0.08 to 0.20++	ą0.025	ą0.05 to 0.15++
U	ą0.13 to 0.38++	ą0.13	ą0.08 to 0.25++
+ These tolerance classes normally apply to IndexableInserts with wiper edges ++ The tolerance is dependent upon the insert size and should be indicated for Insert according to the corresponding dimensional standards.
3. Tolerance class

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Fixing and / or for chip breakers
Symbol	Hole	Shape of hole	Chip- braker	Shape of Insert's section		Symbol	Hole	Shape of hole	Chip- breaker	Shape of Insert's section
N	Without	_	With- out			Q	With	Partly cylindrical hole, 40⁰-60⁰ counter sinks on both sides	With- out
R			Single sided			U	With		Double sided
F			Double sided			B	With	Partly cylindrical hole 70⁰-90⁰ counter sink on both sides only	With- out
A	With	Cylindrical hole	With- out			H	With		Single sided
M			Single sided			C	With	Partly cylindrical hole 70⁰-90⁰ counter sink on both sides	With- out
G			Double sided			J	With	Partly cylindrical hole 70⁰-90⁰ counter sink on both sides	Double sided
W	With	Partly cylindrical hole 400-600 counter sink on one side only	With- out			X	Special features requiring additional specification
T	With		Single sided			X	Special features requiring additional specification

Symbol for insert size according to standardized inscribed circles for equilateral and round inserts
Inscribed Circle diameter(mm)													Metric Round Insert
Inscribed Circle diameter(mm)													dia of insert	Symbol
4.76	-	-	-	04	08	04	05	04	04	08	-	-	-	-
5.56	-	-	-	05	09	05	06	05	05	09	03	-	-	-
6.35	03	02	04	06	11	06	07	06	06	11	04	06	6	06
7.94	04	03	05	07	13	08	09	08	07	13	05	07	8	08
9.525	05	04	07	09	16	09	11	09	09	16	06	09	10	10
12.70	07	05	09	12	22	12	15	13	12	22	08	12	12	12
15.875	09	06	11	15	27	16	19	16	15	27	10	15	16	16
19.05	11	07	13	19	33	19	23	19	19	33	13	19	20	20
25.4	14	10	18	25	44	25	31	26	25	44	17	25	25	25
31.75	18	13	23	31	54	32	38	32	31	54	21	31	32	32