7-Series Cobalt Cutters

Unibroach® Cobalt Cutters

  • Unibroach® 7-Series Cobalt Cutters
  • Unibroach® 7-Series Cobalt Cutters
  • Unibroach® Cobalt Cutters are made with 5% cobalt to increase resistance to wear
  • Excellent results when drilling high-tensile steel and difficult-to-machine materials
  • Available with TiAIN coating upon request
  • Available for hole sizes up to 5" dia.

3/4" shank is standard for cutters up to 3" dia. Metric cutters available on request. See our price list for part numbers.

For custom cutter sizes and specifications, call 1-800-700-5919 or 203-853-9522 for assistance.


  • 1" Depth
  • 2" Depth
  • 3" Depth
  • Annular Cutter Reference Information
Order No. Diameter
1" Depth
7-1-1147/16"
7-1-1161/2"
7-1-1189/16"
7-1-1205/8"
7-1-12211/16"
7-1-1243/4"
7-1-12613/16"
7-1-1287/8"
7-1-13015/16"
7-1-1321"
7-1-1341-1/16"
7-1-1361-1/8"
7-1-1381-3/16"
7-1-1401-1/4"
7-1-1421-5/16"
7-1-1441-3/8"
7-1-1461-7/16"
7-1-1481-1/2"
7-1-1501-9/16"
7-1-1521-5/8"
7-1-1541-11/16"
7-1-1561-3/4"
7-1-1581-13/16"
7-1-1601-7/8"
7-1-1621-15/16"
7-1-1642"
7-1-1662-1/16"
7-1-1682-1/8"
7-1-1702-3/16"
7-1-1722-1/4"
7-1-1742-5/16"
7-1-1762-3/8"
7-1-1782-7/16"
7-1-1802-1/2"
7-1-1822-9/16"
7-1-1842-5/8"
7-1-1862-11/16"
7-1-1882-3/4"
7-1-1902-13/16"
7-1-1922-7/8"
7-1-1942-15/16"
7-1-1963"
7-1-1983-1/16"
7-1-11003-1/8"
7-1-11023-3/16"
7-1-11043-1/4"
7-1-11063-5/16"
7-1-11083-3/8"
7-1-11103-7/16"
7-1-11123-1/2"
7-1-11143-9/16"
7-1-11163-5/8"
7-1-11183-11/16"
7-1-11203-3/4"
7-1-11223-13/16"
7-1-11243-7/8"
7-1-11263-15/16"
7-1-11284"

Order No.Diameter
2" Depth
7-1-2147/16"
7-1-2161/2"
7-1-2189/16"
7-1-2205/8"
7-1-22211/16"
7-1-2243/4"
7-1-22613/16"
7-1-2287/8"
7-1-23015/16"
7-1-2321"
7-1-2341-1/16"
7-1-2361-1/8"
7-1-2381-3/16"
7-1-2401-1/4"
7-1-2421-5/16"
7-1-2441-3/8"
7-1-2461-7/16"
7-1-2481-1/2"
7-1-2501-9/16"
7-1-2521-5/8"
7-1-2541-11/16"
7-1-2561-3/4"
7-1-2581-13/16"
7-1-2601-7/8"
7-1-2621-15/16"
7-1-2642"
7-1-2662-1/16"
7-1-2682-1/8"
7-1-2702-3/16"
7-1-2722-1/4"
7-1-2742-5/16"
7-1-2762-3/8"
7-1-2782-7/16"
7-1-2802-1/2"
7-1-2822-9/16"
7-1-2842-5/8"
7-1-2862-11/16"
7-1-2882-3/4"
7-1-2902-13/16"
7-1-2922-7/8"
7-1-2942-15/16"
7-1-2963"
7-1-2983-1/16"
7-1-21003-1/8"
7-1-21023-3/16"
7-1-21043-1/4"
7-1-21063-5/16"
7-1-21083-3/8"
7-1-21103-7/16"
7-1-21123-1/2"
7-1-21143-9/16"
7-1-21163-5/8"
7-1-21183-11/16"
7-1-21203-3/4"
7-1-21223-13/16"
7-1-21243-7/8"
7-1-21263-15/16"
7-1-21284"
Order No.Diameter
3" Depth
7-1-3243/4"
7-1-32613/16"
7-1-3287/8"
7-1-33015/16"
7-1-3321"
7-1-3341-1/16"
7-1-3361-1/8"
7-1-3381-3/16"
7-1-3401-1/4"
7-1-3421-5/16"
7-1-3441-3/8"
7-1-3461-7/16"
7-1-3481-1/2"
7-1-3501-9/16"
7-1-3521-5/8"
7-1-3541-11/16"
7-1-3561-3/4"
7-1-3581-13/16"
7-1-3601-7/8"
7-1-3621-15/16"
7-1-3642"
7-1-3662-1/16"
7-1-3682-1/8"
7-1-3702-3/16"
7-1-3722-1/4"
7-1-3742-5/16"
7-1-3762-3/8"
7-1-3782-7/16"
7-1-3802-1/2"
7-1-3822-9/16"
7-1-3842-5/8"
7-1-3862-11/16"
7-1-3882-3/4"
7-1-3902-13/16"
7-1-3922-7/8"
7-1-3942-15/16"
7-1-3963"
7-1-3983-1/16"
7-1-31003-1/8"
7-1-31023-3/16"
7-1-31043-1/4"
7-1-31063-5/16"
7-1-31083-3/8"
7-1-31103-7/16"
7-1-31123-1/2"
7-1-31143-9/16"
7-1-31163-5/8"
7-1-31183-11/16"
7-1-31203-3/4"
7-1-31223-13/16"
7-1-31243-7/8"
7-1-31263-15/16"
7-1-31284"

Core Drill SeriesMaterials
Lubrication / Cooling LubricantAluminum/

Nonferrous Metals
Steel <500 N/m²Fine-grain steel

< 700 N/m²
Fine-grain steel

< 1000 N/m²
Stainless Steel InoxCasting
 
Standard HSS25 - 30 m/min25 m/min   10 - 20 m/min
Lubricant oil X    
Grease spray X    
Grease paste      
Special lubricantX     
 
ARMOR-PLATED 10- 15 m/min10- 15 m/min10- 15 m/min  
Lubricant oil XXX  
Grease spray XXX  
Grease paste  XX  
Special Lubricant  XX  
       
TCT HORNET 35 m/min25 m/min20 m/min VCE20 m/min VCE 
Cooling lubricant XXXX 
Drilling emulsion XXXX 

VCE = Full wave control electronics

Cutting speed: (d x π x n) / 1000 = m/min.

Speed: n = (v x 1000) / (d x π) = min-1