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
- - 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
| Tool Info. Standard 2 Flute Counterbore Tools |
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| 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-875 | N/A | 2 | .875 | .330 | 3.750 | 1.750 | 1.125 | .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-1125 | N/A | 2 | 1.125 | .450 | 4.375 | 2.125 | 1.500 | 1.000 | |||
| CBN-1156 | N/A | 2 | 1.156 | .240 | 4.500 | 2.250 | 1.500 | 1.000 | SPEB-432CB / SPEB-432PA | 638T | T-15 |
| CBN-1187 | 3/4 | 2 | 1.187 | .290 | 4.500 | 2.250 | 1.500 | 1.000 | |||
| CBN-1250 | N/A | 2 | 1.250 | .350 | 4.625 | 2.375 | 1.625 | 1.000 | |||
| CBN-1312 | N/A | 2 | 1.312 | .400 | 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-1750 | N/A | 2 | 1.750 | .490 | 5.187 | 2.937 | 2.187 | 1.000 | |||
| CBN-1812 | N/A | 2 | 1.812 | .400 | 5.250 | 3.000 | 2.250 | 1.000 | SPEB-6352CB / SPEB-6352PA | 1012T | T-25 |
| CBN-2000 | N/A | 2 | 2.000 | .590 | 5.500 | 3.000 | 2.500 | 1.250 | |||
| Tool Info. Metric 2 Flute Counterbore Tools |
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| 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-27MM | N/A | 2 | 1.063 | .400 | 4.250 | 2.000 | 1.375 | 1.000 | |||
| CBN-29MM | M-18 | 2 | 1.142 | .240 | 4.500 | 2.250 | 1.531 | 1.000 | SPEB-432CB / SPEB-432PA | 638T | T-15 |
| CBN-30MM | N/A | 2 | 1.181 | .270 | 4.500 | 2.250 | 1.500 | 1.000 | |||
| CBN-31MM | N/A | 2 | 1.220 | .300 | 4.500 | 2.250 | 1.562 | 1.000 | |||
| 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 K11 / K22 & Positive Top D66 or C55
| CBN - Insert Info. Standard & Metric 2 Flute C-Bore Tools |
"C55 & D66" Grades are recommended for Cast Iron | |||||||||
| Insert # | I.C. | T | R | Grades | Insert
Info. Standard & Metric 2 Flute C-Bore Tools |
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| SPEB-1511CB | .187 | .082 | .015 | K11 / K22 | ||||||
| SPEB-221CB | .250 | .125 | .015 | K11 / K22 | Insert # | I.C. | T | R | Grade | |
| SPEB-2522CB | .312 | .125 | .031 | K11 / X40 | SPEB-2522P | .312 | .125 | .031 | C55 | |
| SPEB-332CB | .375 | .187 | .031 | K11 / X40 | SPEB-332P | .375 | .187 | .031 | D66 | |
| SPEB-432CB | .500 | .187 | .031 | K11 / K22 | SPEB-432PA | .500 | .187 | .031 | D66 | |
| SPEB-532CB | .625 | .187 | .031 | K11 / X40 | SPEB-532PA | .625 | .187 | .031 | C55 | |
| SPEB-6352CB | .750 | .220 | .031 | K11 / X40 | SPEB-6352PA | .750 | .220 | .031 | D66 | |
Technical Data
| Speed and Feed Info. Standard CBN & Metric CBN |
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| 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 | 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 | Ductile, Nodular | D66 or C55 / K11 |
| Iron | Cast | 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 - No Hone |
| X40 | Extremely Smooth Boride Coating - No Hone |
| **D66 will replace C55 as inventory runs out** | |
| **K22 will replace X40 as inventory runs out** | |
