5/8" Diameter 300 Series Stainless Long (6XD-8XD): 2-1/2" LOC and Below. Here are the recommended End Mills as well as Speeds and Feeds for the Optimized Tool Path (like a VoluMill, DynamicMill or iMachining) in 303, 304 & 316 Stainless Steel (we based it off 316 so you can increase your SFM to 400 for 303):

5/8" Diameter x 2-1/2" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
5/8" Diameter x 2-1/8" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
5/8" Diameter x 2" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
5/8" Diameter x 1-5/8" Length of Cut x 5 Flute Alcrona Pro Coated Variable Pitch End Mill
| Axial DOC | 2-1/2" and Below |
| Radial DOC | .035" |
| SFM | 350 |
| RPM | 2,140 |
| CLPT | .0035" |
| IPM | 37.45 |
| Metal Removal Rate | 3.27 |
*Do not use these Speeds/Feeds if you are not running an Optimized Tool Path
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