Michigan Drill - Technical Data

Inserts

Standard Insert Identification System
Turning, Boring & Drilling (NOT Milling)

Each of the characters in the part number corresponds to a different characteristic of the insert. Below is a key to identifying the characteristics of the insert by part number.

Example: TNMG 542A
T	N	M	G	5	4	2	A
Shape	Relief Angle	Tolerances	Type	Size	Thickness	Cutting Point Radius, Flats	Other Conditions

Shape
A - Parallelogram 85°
B - Parallelogram 82°
C - Diamond 80°
D - Diamond 55°
E - Diamond 75°
H - Hexagon
K - Parallelogram 55°
L - Rectangle
M - Diamond 86°
O - Octagon
P - Pentagon
R - Round
S - Square
T - Triangle
V - Diamond 35°
W - Trigon 80°

Relief Angle
N - 0°
A - 3°
B - 5°
C - 7°
P - 11°
D - 15°
E - 20°
F - 25°
G - 30°

Tolerances

Insert I.C.

Thickness

A = ±.0002

±.001

B = ±.0002

±.005

C = ±.0005

±.001

D = ±.0005

±.005

E = ±.001

±.001

F = ±.0002

±.001

G = ±.001

±.005

H = ±.0005

±.001

J = ±.0002

±.001

K = ±.0005

±.001

L = ±.001

±.001

M = *

±.005

U = *

±.005

N = *

±.001

* Exact size is determined by size of insert, see below.

I.C.	Min.	U
3/16	.003	.005
7/32	.003	.005
1/4	.003	.005
5/16	.003	.005
3/8	.003	.005
1/2	.005	.008
5/8	.006	.011
3/4	.006	.011
1	.007	.015
1-1/4	.008	.015

R = Blank with grind stock on all surfaces

S = Blank with grind stock on top and bottom surfaces only

Type
A - With hole
B - With hole and one countersink
C - With hole and two countersinks
D - Smaller than 1/4 I.C. with hole
E - Smaller than 1/4 I.C. without hole
F - Clamp-on type with chipbreaker
G - With hole and chipbreaker
H - With hole, one countersink and chipbreaker
J - With hole, two countersinks and chipbreaker
*K - With hole, double sided, special 5° positive chipbreaker
*L - With hole, double sided, special 5° negative chipbreaker
M - With hole and special features on top rake surface only
*N - Narrow chipbreaker land both sides with hole
*O - Bumpy style chipbreaker both sides with hole
P - 10° positive chipbreaker both sides with hole
*Q - Double positive chipbreaker one side, with hole
R - Extra wide chipbreaker land both sides with hole
S - Double positive chipbreaker both sides with hole
T - With hole, one countersink
W - With hole, one countersink
X - Extra Wide chipbreaker groove both sides with hole
Y - High double positive chipbreaker one side with hole
Z - High positive chipbreaker both sides with hole
*ANC Identification only

Size
Number of 1/32nds on inserts less than 1/4 I.C.
Number of 1/8ths on inserts 1/4 I.C. and over.
Regtangle and parallellogram inserts require two digits: 1st Digit = Number of 1/8ths in width 2nd Digit = Number of 1/4ths in length

Thickness
Number of 1/32nds on inserts less than 1/4 I.C.
Number of 1/16ths on inserts 1/4 I.C. and over
Use width dimension in place of I.C. on rectangle and parallelogram inserts.

Cutting Point Radius, Flats

Cutting Point Radius
0 - Sharp Corner	3 - 3/64 Radius
1 - 1/64 Radius	4 1/16 Radius
2 - 1/32 Radius	6 - 3/32 Radius
8 - 1/8 Radius

Flats

A - Square insert with 45° chamfer

B - Square insert with 4° chamfer and 4° sweep angle, R.H. or Neg.

C - Square insert with 45° chamfer and 4° sweep angle, L.H.

D - Square insert with 30° chamfer, R.H. or Neg.

E - Square insert with 15° chamfer, R.H. or Neg.

F - Square insert with 5° chamfer, R.H. or Neg.

G - Square insert with 30° chamfer, L.H.

H - Square insert with 30° chamfer, L.H.

I - Square insert with 15° chamfer, L.H.

J - Square insert with 5° chamfer, L.H.

K - Square insert with 30° double chamfer

L - Square insert with 15° double chamfer

M - Square insert with 5° double chamfer

N - Truncated triangle insert

P - Flatted corner triangle, R.H. or Neg.

R - Flatted corner triangle, L.H.

S - Square negative insert with 10° double chamfer

T - Square negative insert with 30° positive rake chamfer

V - Octagon negative insert with 2-1/2° corner chamfer

Other Conditions
A - Honed .001-.003
B - Honed .003-.005
C - Honed .005-.007
J - Polished cutting surface only
K - Chamfer - cutting edge - complete
T - Chamfer - cutting - partial edge
X - Honed .001