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INDEXABLE INSERT IDENTIFICATION SYSTEM CHART AND TIPS
Ever feel overwhelmed at all the choices out there for indexable inserts? Us too.. So we've created a chart and provided some tips on how to select and use them.
The basics... The first thing to look at are the shapes of the insert (square, triangle, circle, etc..), how they're held (with our without a through hole), size/tolerance, material, and chip "control".
For most of us, triangle inserts are what we're first exposed to. After all, places like ENCO have inexpensive 5-piece tool holders that use these. One of the things you'll also want to consider is the cost of tooling up with inserts. While the holders may not cost a whole lot, the inserts themselves can range anywhere between $1 and $20+ !!
Off we go... The indexable insert system uses a 10-digit schema to describe it. Most notably are the first four letters whic describe the shape, relief angle, tolerance, and insert type:
For example, CNMG describes an insert that's diamond (rhombic) shaped, has zero degree of relief, class M tolerance (more in the tables), double-sided chip breaker and through-hole mount. And that's just the first four placeholders!
Stay tuned...
position |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
inch |
C |
N |
M |
G |
4 |
3 |
2 |
|
|
|
metric |
C |
N |
M |
G |
12 |
04 |
08 |
|
|
|
position 1 - shape |
SYMBOL SHAPE |
INSERT |
SHAPE |
NOSE ANGLE (DEGREE) |
S |
|
SQUARE |
90 |
T |
|
TRIANGULAR |
60 |
C |
|
RHOMBIC (DIAMOND) |
80 |
D |
|
55 |
E |
|
75 |
F |
|
50 |
M |
|
86 |
V |
|
35 |
W |
|
HEXAGONAL (TRIGON) |
80 |
H |
|
HEXAGONAL |
120 |
O |
|
OCTAGONAL |
135 |
P |
|
PENTAGONAL |
108 |
L |
|
RECTANGULAR |
90 |
A |
|
PARALLELOGRAM-SHAPED |
85 |
B |
|
82 |
N/K |
|
55 |
R |
|
ROUND |
N/A |
position 2 - relief angle |
N |
0 |
A |
3 |
B |
5 |
C |
7 |
P |
11 |
D |
15 |
E |
20 |
F |
25 |
G |
30 |
position 3 - tolerance (uncoated only)
coated inserts (class M and U) see other chart |
tolerance class |
tolerance on "IC" insert inscribed circle |
tolerance on "B" |
tolerance on "T" thickness |
in |
mm |
in |
mm |
in |
mm |
D |
+/- .0010 |
+/- 0,025 |
+/- .0005 |
+/- 0,013 |
+/- .0010 |
+/- 0,025 |
H |
+/- .0005 |
+/- 0,013 |
+/- .0005 |
+/- 0,013 |
+/- .0010 |
+/- 0,025 |
E |
+/- .0010 |
+/- 0,025 |
+/- .0010 |
+/- 0,025 |
+/- .0010 |
+/- 0,025 |
G |
+/- .0010 |
+/- 0,025 |
+/- .0010 |
+/- 0,025 |
+/- .0005 |
+/- 0,013 |
M |
see other chart |
see other chart |
+/- .0005 |
+/- 0,013 |
U |
see other chart |
see other chart |
+/- .0005 |
+/- 0,013 |
position 4 - insert type |
insert type |
alternate symbols |
symbol |
hole |
shape of hole |
chipbreaker |
shape of insert (section view) |
ordinary system |
IC less than 1/4" |
N |
without |
N/A |
without |
|
N |
E |
R |
N/A |
single sided |
|
R |
F |
N/A |
double sided |
|
F |
A |
with |
cylindrical hole |
without |
|
A |
D |
M |
single sided |
|
M |
G |
double sided |
|
G |
W |
partially cylindrical hole - 40-60 degree single countersink |
without |
|
A |
T |
single sided |
|
M |
Q |
partially cylindrical hole - 40-60 degree double countersink |
without |
|
A |
U |
double sided |
|
G |
B |
partially cylindrical hole - 70-90 degree single countersink |
without |
|
A |
H |
single sided |
|
M |
C |
partially cylindrical hole - 70-90 degree double countersink |
without |
|
A |
J |
double sided |
|
G |
X |
special |
X |
X |
|
|
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