MITSUBISHI MATERIALS CORPORATION
BACK


EagleLok© INSERTS
Mitsubishi EagleLok Grooving Systems
EagleLok Grooving Insert Selection Guide
  • figureAll EagleLok grooving inserts are precision ground to provide accurate edge location and secure locking of the insert in the toolholder pocket.
  • EagleLok grooving and threading inserts can be used in either toolholders or boring bars.
  • Right-hand EagleLok grooving toolholders use right-hand inserts. Left-hand EagleLok grooving toolholders use left-hand inserts.
  • Right-hand EagleLok grooving boring bars use left-hand inserts. Left-hand EagleLok grooving boring bars use right-hand inserts.
Insert Style Application Rate Standard Groove Additional Information
EG-K
EG-K
  • Chip control geometry
  • General purpose shallow grooving
  • O-ring grooving
  • Circlip grooving
  • Light turning
 10°
Positive		 Size 2 = .031" to .128"
Size 3 = .062" to .189"
Size 4 = .125" to .250"
  • Inch and metric widths standard
  • Chip control works well under a variety of machining conditions
  • Strong EagleLok design allows light axial turning in two directions
EGD-K
EGD-K
  • Chip control geometry
  • Deep grooving
  • Light turning
 10°
Positive		 Size 3 = .062" to .189"
Size 4 = .125" to .250"
  • Deep grooving up to 1/2" deep Chip control works well under a variety of machining conditions
  • Strong EagleLok design allows light axial turning in two directions
ER-K
ER-K
  • Chip control geometry
 10°
Positive		 Radius size
Size 3 = .047" to .078"
Size 4 = .062" to .125"
  • Excellent choice for plunge grooving, turning and profiling
  • Chip control effective at higher feed rates
EF-K
EF-K
  • Face grooving
 10°
Positive		 Size 3 = .125" to .156"
Size 4 = .089" to .250"
  • Face grooving, with chip control, where extra side clearance is required for small diameters
  • EG-style inserts may be used to face groove large diameters
Grade
Uncoated Grade MC11
Uncoated grade MC11 still finds a place in many machining applications. It works well when surface speeds are very low, on materials that are very abrasive, and where diffusion of the coating material into the workpiece is a concern. The cutting edges are not honed, so they are sharp.
MC11 is available in grooving and profiling geometries for applications on titanium, nickel based alloys, high-temperature alloys, austenitic stainless steels, non-ferrous alloys, and non-metals. The fine grain size improves hardness, and therefore resists abrasive wear to maintain a sharp cutting edge longer.
PVD TiN Coated Grade MC11H
This is our most popular PVD grade for threading, grooving, turning, and profiling applications. It is the first choice for machining stainless steel, high temperature alloys, aerospace materials, refractory metals, and aluminum. Run at medium to high speeds and low to medium feeds. The substrate has a fine grain structure and a relatively low binder content that results in high wear resistance. The TiN coating protects the substrate from abrasive and crater wear.
CVD Coated Grade MC736
Our most popular general purpose grade for grooving, turning, and profiling on carbon and alloy steels. Best use is at medium speeds and medium to heavy feeds. Our customers have found great confidence in this grade because it runs efficiently on almost any steel workpiece material. Use this grade on your toughest jobs, including those with interrupted and heavy roughing cuts.
Machining Guidelines for Chip Control—Threading

The unique Mitsubishi recessed chip groove, when used according to our recommendations, breaks the chip in most applications. Our positive rake design lowers cutting pressures, which in turn lowers damaging heat generation, thus providing better tool life. Long, stringy chips no longer mar the workpiece surface finish. The potential danger to operators when removing long chips from the workpiece and chuck is eliminated. All of these benefits combine to improve the productivity of your threading operations.
Coarse Pitch Threading Inserts.
EagleLok threading inserts ET-3RCK, ET-3LCK, ET-4RCK, and ET-4LCK are designed to machine coarse pitch threads more effectively than general purpose designs. The nose radius is larger than regular inserts. This promotes longer tool life while maintaining thread root radius requirements. In addition, the inserts theoretical end point is the same as all standard EagleLok threading inserts.
Machine Programming
Modern CNC controls allow the programmer to easily adjust infeed angle, number of passes, and depth of cut for each pass. EagleLok chip control threading inserts perform best at an infeed angle of 29° 30′. Also, it is important to maintain a minimum of .005" depth of cut on every pass. In most applications, use of CNC “canned” cycles produce only marginally successful results. Custom written programs are better and are recommended.
The Last Pass
Some CNC controls require the last pass to be at a 0° infeed angle. The chip will not break on a last pass infeed angle of 0°. On most carbon and alloy steels, the last pass can remain at .005" depth of cut and produce an acceptable finish. For some materials, a .001" to .003" (spring) pass may be used to improve surface finish, however, chip breaking action may be compromised.
Infeed Angle
Infeed Angle