2.750 - 3.500 Diameter Flat Bottom Drills

Available in 2:1 ratio

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  • - Cuts a flat bottom within .001
  • - Coolant Thru - Side & Rear Ports
  • - Helical flute design
  • - Uses the same insert in both pockets
  • - 4 cutting edges per insert
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Tool Info.
2.750 - 3.500 Dia. Flat Bottom Drills
Tool # D Flutes L L-1 D.O.C. S Coolant Plug Insert
FB-2750 2.750 2-1 Effective 10.125 6.625 5.500 2.000 NPT 3/8 SPEB-842CB
FB-3000 3.000 2-1 Effective 10.625 7.125 6.000
FB-3500 3.500 2-1 Effective 11.625 8.125 7.000

Insert Info.

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Insert Info.
2.750 - 3.500 Dia. Flat Bottom Drills
SPEB-842CB
Grades X33 / X40
I.C. 1.000
T .250
R .031
Screw 1412T
Wrench T-532

Technical Data

Speed and Feed Info.
2.750 - 3.500 Dia. Flat Bottom Drill
Material S.F.M. I.P.R.
Mild & Low Carbon Steel
Ex. 1018, 1020, 1117, 1141, 12L14
800 - 1200 .003 - .005
High Carbon & Alloy Steel
Ex. 1045, 4140, 4340, 52100, 8620
500 - 800 .003 - .005
Lower Carbon Tool Steel
Ex. P-20, H-13, S-7
400 - 700 .003 - .005
Tool Steel
Ex. A-2, A-6, D-2, M-2
300 - 600 .002 - .004
Stainless Steel
Ex. 304, 316, 420, 15-5PH, 17-4PH
300 - 600 .002 - .004
Iron
Ex. Cast, Ductile, Nodular
600 - 1000 .003 - .006
Nickel & Titanium Alloy
Ex. Inconel, Hastelloy, TI-6AL-4V
120 - 180 .002 - .003
Non-Ferrous Metal
Ex. Aluminum, Bronze, Brass
1000 - 2500 .004 - .008
Insert Grade Selection
Flat Bottom Drills
Material Material Examples Preferred Grade
Mild & 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 X33
Iron Ductile X33
Nickel & Titanium Alloys Inconel, Hastelloy, TI-6AL-4V X33
Non-Ferrous Metals Aluminum, Bronze, Brass X40 / X33
Insert Grade Description
Grade Description
X33 High Performance Nitride Coating
X40 Extremely Smooth Boride Coating

***Important***

  • To maintain correct drill diameter in lathe applications
  • indicate the drill to spindle center.
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