SM Series 5-flute variable helix for 304/316 stainless and TM Series polished flutes for Ti-6Al-4V. We ran the tests on our own Haas machines last month — here’s exactly what worked and what failed.
If you’re milling 304, 316 or Ti-6Al-4V and your tools keep welding chips or dying after 30–40 minutes, you’re probably using the wrong geometry. After side-by-side tests on our shop floor in Dongguan, the clear winners are SM Series 5-flute variable helix for stainless and TM Series polished 4/5-flute for titanium. Both beat generic 4-flute carbide by 2.5–3× tool life when you dial in the right parameters.
Stainless 304/316 → SM Series 5-flute unequal pitch + U-groove + AlCrN
Titanium Ti-6Al-4V → TM Series 4/5-flute polished flutes + variable helix
Tool life jumps from 35–50 min to 110–130 min on the same machine
Feed rate up 20–25% with no built-up edge
Side-by-Side Comparison Table
Stainless Steel – Why SM Series Wins
Titanium – Why TM Series Is the Only Real Choice
Two Real Shop Stories (Not Theory)
6-Question Checklist – Pick the Right Tool in 30 Seconds
Frequently Asked Questions
| Factor | Generic 4-Flute | SM Series (Stainless) | TM Series (Titanium) | Winner |
|---|---|---|---|---|
| Flute Count | 4 | 4 (unequal pitch) | 4 or 5 (variable helix) | SM/TM |
| Helix Angle | 30-35° | 38°-45° variable | 35°-42° variable + polished | SM/TM |
| Chip Evacuation | Average | U-type groove | High-polish Ra<0.2μm | SM for SS, TM for Ti |
| Tool Life 316 SS / Ti6Al4V | 35-50 min | 110-130 min | 90-120 min | SM/TM (2.5-3×) |
| Feed Rate Boost | — | +20-25% | +15-30% | SM/TM |
Data from our Haas VF-2 tests, same material, same machine, same operator. Real numbers, no marketing fluff.
304 and 316 love to work-harden and weld chips. Generic 4-flute tools jam the flutes and overheat the edge in minutes.
Our SM Series fixes it with unequal flute spacing, 45° variable helix and big U-type chip grooves. Chips fly out instead of packing. Last month we ran 316 at 180 m/min, 0.08 mm/tooth, 2 mm DOC. Generic tool lasted 42 minutes and left Ra 1.8 μm. SM Series ran 118 minutes with Ra 0.9 μm and zero built-up edge.
Coating tip: AlCrN for dry or light coolant, TiAlSiN when you have 20+ bar through-tool coolant.
Ti-6Al-4V has terrible thermal conductivity. Heat stays in the cutting zone and the edge dulls fast.
TM Series uses mirror-polished flutes (Ra <0.2 μm), reinforced edges and variable helix. Chips slide off instead of welding. We tested a 10 mm 5-flute at 80 m/min, 0.06 mm/tooth, 1.5 mm DOC. Standard polished tool lasted 38 minutes before chipping. TM lasted 105 minutes and gave consistent Ra 0.6 μm even in 45 mm deep pockets.
Pro tip: always run high-pressure coolant or at least 70 bar flood. Without it even the best carbide struggles.
Customer was changing tools 3 times per shift. Switched to SM Series 8 mm 5-flute. Feed up 22 %, tool changes dropped to 1 per shift. Saved roughly $3800/month in tooling.
Expensive import tool was chipping after 38 minutes. Replaced with TM Series 6 mm long-reach. Cycle time down 18 % and parts passed final inspection first time. Now ordering 200 pieces a month.
Material = 304/316/Duplex? → SM Series 5-flute
Material = Ti-6Al-4V or medical titanium? → TM Series 4/5-flute
Deep pocket or long reach needed? → TM long-neck version
Dry or MQL only? → SM with AlCrN
Need mirror finish under 0.8 μm? → TM polished + light finishing pass
Budget tight but volume high? → SM – lowest cost per part in 90 % of stainless jobs
Send us your material, machine model, current speeds/feeds and the size you run most. We’ll reply with exact parameters and a side-by-side cost comparison within 24 hours — no sales pitch, just real numbers from the floor.
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