.875 & 1.000 Diameter Drill Mill Twins

  • 2 Effective Center Cutting Endmills.
  • Double the feed rate when used for:
  • Milling - Ramping - Helical Interpolations - Slotting
.875 & 1.000 Dia. Drill MIll Twin.png
  • Cuts a flat bottom within .001
  • Center cutting
  • Drill from solid or ramp into a part at any angle
  • Ideal for pocket milling
  • Counterboring
  • 4 cutting edges per insert
  • IMPORTANT: When ordering inserts
  • Order all Positive Top Inserts When Ramping or Pocket Milling
  • Order all Chipbreaker Inserts When Drilling or C-Boring
.875 & 1.000 Dia. Drill Mill Twin Drawing.png
Tool Info.
.875 & 1.000 Dia. Drill Mill Twin
Tool # D L L-1 B S (Milling) Inserts (Drilling) Screw Wrench
DMT-875 .875 3.625 1.375 .280 1.000 (1) SPEB-3522PA
&
(1) SPEB-2522P
or N/A
&
(1) SPEB-2522CB
614T

314T
T-15

T-8
DMT-100 1.000 3.625 1.375 .340 1.000 (1) SPEB-422PA
&
(1) SPEB-322P
or (1) SPEB-422CB
&
(1) SPEB-322CB
638T

414T
T-15

T-10
XDMT-100 1.000 5.250 2.000 .340 1.000
  • Modifications:
  • Reduce Shank Diameter
  • Add Coolant Thru
  • Delivery on modified tools is 2 - 3 working days

Insert Info.

Insert Info

SPEB / SDEB - Chipbreaker Illustration.png
Positive Top Insert Info.
.875 & 1.000 Dia. Drill Mill Twin
(Milling)
Insert # I.C. T R Grades
SPEB-2522P .312 .125 .031 C55 / X33 / X40
SPEB-322P .375 .125 .031 C55 / X33 / X40
SPEB-3522P .437 .125 .031 X33
SPEB-422PA .500 .125 .031 X33
SPEB-Postive top insert.png
Chipbreaker Insert Info.
.875 & 1.000 Dia. Drill Mill Twin
(Drilling or C-Boring)
Insert # I.C. T R Grades
SPEB-2522CB .312 .125 .031 X33 / X40
SPEB-322CB .375 .125 .031 X33 / X40
SPEB-422CB .500 .125 .031 X33 / X40

Technical Info

Speed and Feed Info.
.875 - 1.000 Dia. Drill Mill Twin
Material S.F.M. Drilling
I.P.R.
Milling
I.P.R.
Mild & Low Carbon Steel
Ex. 1018, 1020, 1117, 1141, 12L14
800 - 1200 .003 - .005 .004 - .008
High Carbon & Alloy Steel
Ex. 1045, 4140, 4340, 52100, 8620
500 - 800 .003 - .005 .004 - .008
Lower Carbon Tool Steel
Ex. P-20, H-13, S-7
400 - 700 .003 - .005 .004 - .008
Tool Steel
Ex. A-2, A-6, D-2, M-2
300 - 600 .003 - .005 .004 - .008
Stainless Steel
Ex. 304, 316, 420, 15-5PH, 17-4PH
300 - 600 .003 - .005 .004 - .008
Iron
Ex. Cast, Ductile, Nodular
600 - 1000 .003 - .005 .004 - .010
Nickel & Titanium
Ex. Inconel, Hastelloy, TI-6AL-4V
120 - 180 .002 - .004 .002 - .004
Non-Ferrous Metal
Ex. Aluminum, Bronze, Brass
1000 - 2500 .003 - .005 .004 - .010
Insert Grade Selection
.875 & 1.000 Dia. Drill Mill Twin
Material Material Examples Preferred Grade
High & Low Carbon Steels 1018, 1020, 1117, 1141, 12L14 X33
High Carbon & Alloy Steels 1045, 4140, 4340, 52100, 8620 X33
Lower Carbon Tool Steels P-20, H-13, S-7 X33
Tool Steels A-2, A-6, D-2, M-2 X33
Stainless Steels 303, 304, 316, 420, 15-5PH, 17-4PH X33
Iron Cast, Nodular C55 / X33
Iron Ductile X33
Nickel & Titanium Alloys Inconel, Hastelloy, TI-6AL-4V X33
Non-Ferrous Metals Aluminum, Bronze, Brass X33 / X40
Insert Grade Description
Grade Description
C55 Multi-Layer Power Nitride Coating
X33 High Performance Nitride Coating
X40 Extremely Smooth Boride Coating
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