1.250 Diameter Drill Mill Twins

  • 2 Effective Center Cutting Endmills.
  • Double the feed rate when used for:
  • Milling - Ramping - Helical Interpolations - Slotting
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  • - 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
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Tool Info.
1.250 Drill Mill Twin
Tool # D L L-1 B S (Milling) Inserts (Drilling) Screw Wrench
DMT-1250 1.250 4.000 1.750 .465 1.000 (1) SPEB-432PA or (1) SPEB-432CB 638T T-15
XDMT-1250 1.250 5.000 2.750 .465 1.250 (1) SPEB-532PA (1) SPEB-532CB 838T T-20

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Positive Top Insert Info.
1.250 Drill Mill Twin
(Milling)
Insert # I.C. T R Grades
SPEB-432PA .500 .187 .031 D66 / K11 / X40
SPEB-532PA .625 .187 .031 C55 / K11 / K22
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Chipbreaker Insert Info.
1.250 Dia. Drill Mill Twin
(Drilling or C-Boring)
Insert # I.C. T R Grades
SPEB-432CB .500 .187 .031 K11 / X40
SPEB-532CB .625 .187 .031 K11 / X40

Speed and Feed Info.
1.250 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
1.250 Dia. Drill Mill Twin
Material Material Examples Preferred Grade
High & Low Carbon Steels 1018, 1020, 1117, 1141, 12L14 K11
High Carbon & Alloy Steels 1045, 4140, 4340, 52100, 8620 K11
Lower Carbon Tool Steels P-20, H-13, S-7 K11
Tool Steels A-2, A-6, D-2, M-2 K11
Stainless Steels 303, 304, 316, 420, 15-5PH, 17-4PH K11
Iron Cast, Nodular D66 or C55 / K11
Iron Ductile K11
Nickel & Titanium Alloys Inconel, Hastelloy, TI-6AL-4V K11
Non-Ferrous Metals Aluminum, Bronze, Brass K22 or X40 / K11
Insert Grade Description
Grade Description
D66 Multi-Layer Dense Coating
C55 Advanced Multi-Layer PVD Coated Carbide
K11 Universal High Performance Dense Coating
K22 Ultra Smooth Dense Coating / Periphery Ground
X40 Extremely Smooth Boride Coating / Periphery Ground
**C55 will be replaced with D66
as inventory runs out **
**X40 will be replaced with K22
as inventory runs out **
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