Roughing Cut Cobalt High Speed Steel
List 420: Stub Length - Multiple Flute - Fine Pitch List 450: Multiple Flute - Fine Pitch - Center Hole
Side Milling
Hardness
<20 HRC
20-30 HRC
30-40 HRC
40-50 HRC
High Tensile Steels Tool Steels Medium Strength Stainless Steels and Titanium Alloys
Heat Resistant High Alloys High Strength and Titanium Alloys Stainless Steels
High Tensile Steels Unalloyed Titanium Heat Resistant Ferritic Low Alloys
Work Material
Medium Tensile Steels Mild Steels
Cutting Speed
90-110 SFM
60-75 SFM
45-60 SFM
30-45 SFM
a a=1.5D a r= 0.5D
Depth of Cut
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Mill Dia.
1/4
1,500 1,180 1,000
4.0 4.5 4.8 5.8 6.6 7.5 7.9 7.4 7.0 6.4 5.9 5.0 4.5
1,000
2.6 3.3 3.3 3.9 4.4 4.8 5.3 4.9 4.6 4.3 3.6 3.3 2.9
800 630 530 400 315 265 224 200 180 160 132 112 100
1.9 2.3 2.5 2.9 3.3 3.5 3.5 3.5 3.5 3.1 2.8 2.4 2.3
530 425 355 265 224 180 150 132 118 106
1.1 1.3 1.4 1.6 2.0 2.0 1.9 1.9 1.8 1.8 1.6 1.4 1.4
5/16
800 670 500 400 325 280 250 224 200 160 140 125
3/8 1/2 5/8 3/4 7/8
750 600 500 425 375 335 300 250 312 190
1
1-1/8 1-1/4 1-1/2 1-3/4
90 75 67
2
Slotting
Hardness
<20 HRC
20-30 HRC
30-40 HRC
40-50 HRC
High Tensile Steels Tool Steels Medium Strength Stainless Steels and Titanium Alloys
Heat Resistant High Alloys High Strength and Titanium Alloys Stainless Steels
High Tensile Steels Unalloyed Titanium Heat Resistant Ferritic Low Alloys
Work Material
Medium Tensile Steels Mild Steels
Cutting Speed
90-110 SFM
60-75 SFM
45-60 SFM
30-45 SFM
Depth of Cut
a a=0.8D
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Speed RPM
Feed in/min
Mill Dia.
1/4 3/8 1/2 5/8 3/4 7/8
1,500 1,000
4.1 4.6 5.0 5.1 6.1 6.1 5.8 5.4 5.0
1,000
2.5 3.0 3.0 3.8 4.0 4.0 3.9 3.6 3.3
800 530 400 315 265 224 200 160 132
1.5 1.9 2.0 2.3 2.9 2.9 2.8 2.5 2.4
530 355 265 224 180 150 132 106
0.9 1.0 1.3 1.4 1.5 1.6 1.6 1.5 1.4
670 500 400 325 280 250 200 160
750 600 500 425 375 300 200
1
1-1/4 1-1/2
90
osgtool.com
1419
End Mill Technical
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