HY-PRO ® CARB Performance Sub-Micrograin Carbide End Mills
List HP421
Slotting (Fractional)
Hardness
–
<20 HRC
20-30 HRC
30-38 HRC
38-45 HRC
45-55 HRC
55-60 HRC
Hardened Steels Pre-hardened Steels Ti Alloys (Solution Treated and Aged)
Hardened Steels Pre-hardened Steels Stainless Steels Inconel Ni Based Alloys
Alloy Steels Tool Steels Ti Alloys (Annealed)
Work Material
Mild Steels Carbon Steels
Hardened Steels
Hardened Steels
Cast Iron
Cutting Speed
360 SFM
330 SFM
260 SFM
220 SFM
180 SFM
120 SFM
80 SFM
Dia a a D<1/16 0.01D 1/16≤D≤1/8 0.02D 1/8≤D 0.05D
Dia a a D<1/16 0.1D 1/16≤D≤1/8 0.3D 1/8≤D 0.5D
Dia a a D<1/16 0.02D 1/16≤D 0.05D
Depth of Cut
Speed RPM 21,990 14,660
Feed in/min
Speed RPM 20,150 13,440
Feed in/min
Speed RPM 15,880 10,590
Feed in/min
Speed RPM 13,440
Feed in/min
Speed RPM 10,990
Feed in/min
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Mill Dia.
1/16 3/32
7.9 9.6
7.2 8.8
7.2 7.3 8.0 9.2
5.1 5.1 5.4 6.1 6.0 6.0 5.9 5.9 5.9 5.6 4.7 3.8 3.0
3.5 3.7 4.0 4.2 4.5 4.7 4.7 4.5 4.4 4.4 4.0 3.2 2.6
7,330 4,890 3,660 2,930 2,360 1,775 1,390 1,200 1,035
2.0 2.3 2.5 2.6 2.6 2.6 2.4 2.4 2.3 2.1 1.7 1.4 0.9
4,890 3,260 2,440 1870 1,590 1,205
1.3 1.3 1.5 1.4 1.4 1.2 1.2 1.2 1.0 0.9 0.7 0.6 0.5
8,960 6,720 5,370 4,455 3,375 2,660 2,225 1,895 1,655 1,330 1,095
7,330 5,500 4230 3,785 2,870 2,295 1,910 1,630 1,415 1,150
1/8
10,990 12.4 10,080 11.5
7,940 6,350 5,325 4,125 3,270 2,735 2,345 2,030 1,625 1,305 1,020
5/32 3/16
8,790 7,190 5,600 4,395 3,695 3,160 2,760 2,195 1,760 1,360
13.6 15.4 16.0 15.3 14.7 14.5 14.5 12.6 11.1
8,060 6,540 5,090 4,000 3,360 2,870 2,510 1,995 1,605 1,240
12.4 14.0 14.5 13.9 13.3 13.2 13.2 12.3 10.0
10.5 11.1 11.1 11.0 10.9 10.6
1/4
5/16
960 800 690 600 470 410 300
3/8
7/16
1/2 5/8 3/4
900 720 580 440
9.5 7.6 6.0
935 720
1
8.5
7.7
840
For side milling, increase feeds 20% to 50%.
Slotting (Metric)
Hardness
–
<20 HRC
20-30 HRC
30-38 HRC
38-45 HRC
45-55 HRC
55-60 HRC
Hardened Steels Pre-hardened Steels Ti Alloys (Solution Treated and Aged)
Hardened Steels Pre-hardened Steels Stainless Steels Inconel Ni Based Alloys
Alloy Steels Tool Steels Ti Alloys (Annealed)
Work Material
Mild Steels Carbon Steels
Hardened Steels
Hardened Steels
Cast Iron
Cutting Speed
360 SFM
330 SFM
260 SFM
220 SFM
180 SFM
120 SFM
80 SFM
a a
Dia a a D<1 0.01D 1≤D≤3 0.02D 3≤D 0.05D
Dia D<1
Dia a a D<1 0.02D 1≤D 0.05D
Depth of Cut
0.1D 1≤D≤3 0.3D 3≤D 0.5D
Speed RPM 25,000 17,424
Feed in/min
Speed RPM 25,000 15,840
Feed in/min
Speed RPM 25,000 12,096
Feed in/min
Speed RPM 21,330 10,660
Feed in/min
Speed RPM 17,450
Feed in/min
Speed RPM 11,634
Feed in/min
Speed RPM
Feed in/min
Mill Dia.
1 2 3 4 5 6 8
6.5 8.4
6.6 7.6
8.4 7.0 7.8 9.4
6.0 5.3 5.2 6.1 6.1 6.2 5.9 6.0 6.0 5.2 4.7 4.2 3.7 3.3 3.1
4.1 4.0 3.9 4.4 4.5 4.5 4.5 4.3 4.3 4.4 3.8 3.4 3.0 2.8 2.5
2.0 2.3 2.6 2.6 2.7 2.8 2.5 2.4 2.2 2.0 1.7 1.4 1.4 1.2 1.0
7,756 3,960 2,585 1,939 1,551 1,293
1.5 1.4 1.5 1.5 1.4 1.2 1.2 1.2 1.0 0.9 0.7 0.7 0.6 0.5 0.5
9,144 5,817 4,363 3,490 2,908 2,181 1,745 1,454 1,246 1,091
5,688 3,960 2,908 2,327 1,939 1,454 1,163
11,750 12.5 10,656 11.4
8,400 6,300 5,040 4,200 3,150 2,520 2,100 1,800 1,580 1,400 1,260 1,150 1,010
7,110 5,330 4,270 3,560 2,670 2,130 1,780 1,520 1,330 1,190 1,070
8,730 6,980 5,820 4,360 3,490 2,910 2,490 2,180 1,940 1,750 1,590 1,400
13.6 16.4 16.0 15.3 14.5 14.5 14.4 12.5 12.2 10.9
8,000 6,400 5,330 4,000 3,200 2,670 2,290 2,000 1,780 1,600 1,460 1,280
12.6 15.0 14.6 14.1 13.3 13.3 13.2 12.4 11.2 10.0
10.9 10.8 10.8 10.7 10.6 10.2
969 776 646 554 485 431 388 353 310
10 12 14 16 18 20 22 25
969 831 727 646 582 529 465
9.2 8.3 7.3 6.8 6.0
969 873 793 698
9.9 8.7
9.1 7.9
970 850
For side milling, increase feeds 20% to 50%.
osgtool.com
1393
End Mill Technical
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