1.156 - 1.375 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.
1.156 Dia. - 1.375 Dia. Flat Bottom Drills
Tool # D Flutes L L-1 D.O.C. S Coolant Plug Inserts
FB-1156 1.156 2-1 Effective 6.000 3.750 2.312 1.250 NPT 1/4 SPEB-332CB

or

SPEB-332P
FB-1156-3 1.156 2-1 Effective 7.125 4.875 3.468
FB-1187 1.187 2-1 Effective 6.000 3.750 2.375
FB-1187-3 1.187 2-1 Effective 7.125 4.875 3.562
FB-1250 1.250 2-1 Effective 6.000 3.750 2.500
FB-1250-3 1.250 2-1 Effective 7.500 5.250 3.750
FB-1281 1.281 2-1 Effective 6.000 3.750 2.562
FB-1281-3 1.281 2-1 Effective 6.000 3.750 3.843
FB-1312 1.312 2-1 Effective 6.000 3.750 2.625
FB-1312-3 1.312 2-1 Effective 7.562 5.312 3.937
FB-1375 1.375 2-1 Effective 6.000 3.750 2.750
FB-1375-3 1.375 2-1 Effective 7.625 5.375 4.125

Insert Info. 

Chipbreaker & Positive Top Inserts

Insert Info.
1.156 - 1.375 Dia. Flat Bottom Drills
SPEB-332CB   SPEB-332P
Grades X33 / X40 Grade C55
I.C. .375 I.C. .375
T .187 T .187
R .031 R .031
Screw 538T Screw 538T
Wrench T-10 Wrench T-10

Technical Data

Speed and Feed Info.
1.156 - 1.375 Dia. Flat Bottom Drills
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 C55 / 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
C55 Multi-Layer Power Nitride Coating
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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