The Ultimate Guide to Cutting 316 Stainless Steel

5/10/2026 · 12 min read

## Why 316 stainless is harder to cut than 304 316 contains 2–3% molybdenum for corrosion resistance — the same property that makes it gummy, work-hardening, and unforgiving when your feeds drop. Marine, medical, food, and chemical industries rely on it, which is why every fabricator eventually has to master it. ## Tooling that actually survives 316 Use submicron carbide grades (e.g. C2 / sub-grade 883) with a TiAlN or AlTiN coating. HSS works only for hand tools and slow drilling — and only if you keep it cool. Avoid worn edges at all costs: a dull tool burnishes the surface and instantly hardens the layer underneath. ## Speeds and feeds that work For solid carbide end mills in 316, start at 60–120 SFM with a chip load of 0.001"–0.004" per tooth depending on diameter. Drilling? 40–60 SFM with peck cycles. Always err on the side of *more feed, less speed* — the chip must carry heat away from the cutter. ## Coolant strategy Flood coolant with a 7–10% concentration of a semi-synthetic cutting fluid is the baseline. For deep drilling, through-tool coolant is non-negotiable. Mist or MQL only works for light operations on thin material. ## Beating work hardening The cardinal rule: **never dwell, never rub**. Engage the cutter, take a real chip, and exit. If you stop mid-cut you've already hardened the surface for the next pass. Climb-mill where rigidity allows.