Standard and Metric Diameter Counterbore Tools

  • Standard Socket Head Cap Screw C-Bore Diameters for: 5/16" - 1'"
  • Standard Socket Head Cap Screw C-Bore Diameters for: M6 - M30
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  • - Expanded Range of Cutting Diameters: .500 - 2.000
  • - Cuts a Flat Counterbore within .001
  • - Coolant Thru
  • - Designed for C.N.C. Applications

Counterbore Product Video

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Tool Info.
Standard 2 Flute Counterbore Tools
Tool # S.H.C.S.Size Flutes D E L L-1 D.O.C S Inserts Screw Wrench
CBN-500 5/16 2 .500 .180 2.812 1.062 .625 .500 SPEB-1511CB 164T T-6
CBN-531 N/A 2 .531 .200 2.812 1.062 .625 .500
CBN-562 N/A 2 .562 .240 2.875 1.125 .687 .500
CBN-594 3/8 2 .594 .150 3.375 1.375 .750 .750 SPEB-221CB 300T T-8
CBN-625 N/A 2 .625 .180 3.437 1.437 .812 .750 SPEB-221CB 314T
CBN-687 7/16 2 .687 .240 3.500 1.500 .875 .750
CBN-718 N/A 2 .718 .188 3.500 1.500 .875 .750 SPEB-2522CB / SPEB-2522P
CBN-750 N/A 2 .750 .210 3.625 1.625 .937 .750
CBN-781 1/2 2 .781 .260 3.625 1.625 1.000 .750
CBN-812 N/A 2 .812 .280 3.625 1.625 1.000 .750
CBN-906 9/16 2 .906 .260 4.000 1.750 1.125 1.000 SPEB-332CB / SPEB-332P 538T T-10
CBN-1000 5/8 2 1.000 .360 4.125 1.875 1.250 1.000
CBN-1187 3/4 2 1.187 .290 4.500 2.250 1.500 1.000 SPEB-432CB / SPEB-432PA 638T T-15
CBN-1250 N/A 2 1.250 .350 4.625 2.375 1.625 1.000
CBN-1375 7/8 2 1.375 .480 4.750 2.500 1.750 1.000
CBN-1437 N/A 2 1.437 .520 4.812 2.562 1.812 1.000
CBN-1500 N/A 2 1.500 .340 4.875 2.625 1.875 1.000 SPEB-532CB / SPEB-532PA 838T T-20
CBN-1625 1" 2 1.625 .480 5.000 2.750 2.000 1.000
CBN-1812 N/A 2 1.812 .400 5.250 3.000 2.250 1.000
CBN-2000 N/A 2 2.000 .590 5.500 3.000 2.500 1.250 SPEB-6352CB / SPEB-6352PA 1012T T-25
Tool Info.
Metric 2 Flute Counterbore Tools
Tool # S.H.C.S. Size Flutes D E L L-1 D.O.C S Inserts Screw Wrench
CBN-11MM M-6 2 .433 .120 2.750 1.000 .563 .500 SPEB-1511CB 164T T-6
CBN-15MM M-8 2 .590 .150 3.250 1.250 .625 .750 SPEB-221CB 300T T-8
CBN-16MM N/A 2 .630 .185 3.437 1.437 .812 .750 SPEB-221CB 314T
CBN-18MM M-10 2 .709 .188 3.500 1.500 .875 .750 SPEB-2522CB / SPEB-2522P 314T
CBN-20MM M-12 2 .787 .250 3.625 1.625 .937 .750
CBN-22MM N/A 2 .866 .290 4.000 1.750 1.156 1.000
CBN-24MM M-14 2 .945 .290 4.000 1.750 1.156 1.000 SPEB-332CB / SPEB-332P 538T T-10
CBN-26MM M-16 2 1.024 .370 4.250 2.000 1.375 1.000
CBN-29MM M-18 2 1.142 .240 4.500 2.250 1.562 1.000 SPEB-432CB / SPEB-432PA 638T T-15
CBN-33MM M-20 2 1.299 .390 4.625 2.375 1.625 1.000
CBN-38MM M-24 2 1.496 .350 5.000 2.750 2.000 1.000 SPEB-532CB / SPEB-532PA 838T T-20
CBN-48MM M-30 2 1.890 .490 5.375 3.125 2.375 1.000 SPEB-6352CB / SPEB-6352PA 1012T T-25

Insert Info.

Chip Breaker X33 / X40 & Positive Top C55

CBN - Insert Info.
Standard & Metric 2 Flute C-Bore Tools
  "C55" Grade is recommended for Cast Iron
Insert # I.C. T R Grades   Insert Info.
Standard & Metric 2 Flute C-Bore Tools
SPEB-1511CB .187 .082 .015 X33 / X40  
SPEB-221CB .250 .125 .015 X33 / X40   Insert # I.C. T R Grade
SPEB-2522CB .312 .125 .031 X33 / X40   SPEB-2522P .312 .125 .031 C55
SPEB-332CB .375 .187 .031 X33 / X40   SPEB-332P .375 .187 .031 C55
SPEB-432CB .500 .187 .031 X33 / X40   SPEB-432PA .500 .187 .031 C55
SPEB-532CB .625 .187 .031 X33 / X40   SPEB-532PA .625 .187 .031 C55
SPEB-6352CB .750 .220 .031 X33 / X40   SPEB-6352PA .750 .220 .031 C55

Technical Data

Speed and Feed Info.
Standard CBN & Metric CBN
Material S.F.M. .433 -.500 Dia.
I.P.T.
.590 - .787 Dia.
I.P.T.
.906 - 2.000 Dia.
I.P.T.
Mild & Low Carbon Steel
Ex. 1018, 1020, 1117, 1141, 12L14
800 - 1200 .001 - .003 .002 - .004 .003 - .005
High Carbon & Alloy Steel
Ex. 1045, 4140, 4340, 52100, 8620
500 - 800 .001 - .003 .002 - .003 .003 - .005
Lower Carbon Tool Steel
Ex. P-20, H-13, S-7
400 - 700 .001 - .003 .002 - .003 .003 - .005
Tool Steel
Ex. A-2, A-6, D-2, M-2
300 - 600 .001 - .003 .001 - .003 .002 - .004
Stainless Steel
Ex. 304, 316, 420, 15-5PH, 17-4PH
300 - 600 .001 - .003 .001 - .003 .002 - .004
Iron
Ex. Cast, Ductile, Nodular
600 - 1000 .002 - .005 .002 - .005 .003 - .006
Nickel & Titanium Alloy
Ex. Inconel, Hastelloy, TI-6AL-4V
120 - 180 .001 - .002 .001 - .002 .002 - .003
Non-Ferrous Metal
Ex. Aluminum, Bronze, Brass
1000 - 2500 .003 - .006 .003 - .006 .004 - .008
Insert Grade Selection
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 X40 / X33
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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