.687 - .812 Diameter Flat Bottom Drills

Available in 2:1 & 3:1 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.
.687 - .812 Dia. Flat Bottom Drill
Tool # D Flutes L L-1 D.O.C. S Coolant Plug Insert
FB-687 .687 2-1 Effective 4.250 2.250 1.375 .750 NPT 1/8 SPEB-221CB
FB-687-3 .687 2-1 Effective 4.937 2.937 2.062
FB-718 .718 2-1 Effective 4.250 2.250 1.437
FB-718-3 .718 2-1 Effective 5.062 3.062 2.187
FB-750 .750 2-1 Effective 4.750 2.500 1.500 1.000
FB-750-3 .750 2-1 Effective 5.500 3.250 2.250
FB-781 .781 2-1 Effective 4.750 2.500 1.562
FB-781-3 .781 2-1 Effective 5.500 3.250 2.343
FB-812 .812 2-1 Effective 4.750 2.500 1.625
FB-812-3 .812 2-1 Effective 5.625 3.375 2.437

Insert Info.

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Insert Info.
.687 - .812 Dia. Flat Bottom Drills
SPEB-221CB
Grades X33 / X40
I.C. .250
T .125
R .015
Screw 314T
Wrench T-8

Technical Data

Speed and Feed Info.
.687 - .812 Dia. Flat Bottom Drill
Material S.F.M. I.P.R.
Mild & Low Carbon Steel
Ex. 1018, 1020, 1117, 1141, 12L14
800 - 1200 .002 - .004
High Carbon & Alloy Steel
Ex. 1045, 4140, 4340, 52100, 8620
500 - 800 .002 - .003
Lower Carbon Tool Steel
Ex. P-20, H-13, S-7
400 - 700 .002 - .003
Tool Steel
Ex. A-2, A-6, D-2, M-2
300 - 600 .001 - .003
Stainless Steel
Ex. 304, 316, 420, 15-5PH, 17-4PH
300 - 600 .001 - .003
Iron
Ex. Cast, Ductile, Nodular
600 - 1000 .002 - .005
Nickel & Titanium Alloy
Ex. Inconel, Hastelloy, TI-6AL-4V
120 - 180 .001 - .002
Non-Ferrous Metal
Ex. Aluminum, Bronze, Brass
1000 - 2500 .003 - .006
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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