Bandsaw Blade Selection Guide
TPI by cut height, blade speed by material, variable pitch, coolant, and blade-type basics
Start with the Bandsaw Blade Speed Calculator for instant TPI and SFM picks. This guide explains the rules behind those numbers and when to deviate. For blade-type cost/durability decisions, see Bi-Metal vs Carbide vs Carbon. When cuts fail despite correct settings, use Bandsaw Blade Troubleshooting.
Quick start
Measure cut height (round diameter, square side, or rectangular thickness). Pick TPI from the table below. Set wheel RPM so blade rim speed hits the SFM range for your material and blade type. Verify at least 3 teeth stay in the cut.
Open Calculator Blade Type DecisionThe 3-Teeth-in-Cut Rule
Every bandsaw blade selection starts with one constraint: at least three teeth must be inside the material during the cut. Fewer teeth means each tooth carries too much load — teeth strip, the blade wanders, and thin-wall tube collapses. Too many teeth pack chips in the gullet, overheat the blade, and burn the cut face on thin stock.
Example: 1.5″ round mild steel bar needs roughly 6–10 TPI. At 8 TPI, teeth in cut = 1.5 × 8 = 12 — well above the minimum. At 4 TPI, only 6 teeth engage — still OK. At 2 TPI on the same bar, only 3 teeth — borderline; any variation in feed stalls a tooth.
When stock thickness varies (mixed bundles, I-beam flanges vs web), variable-pitch blades span two TPI ranges and reduce harmonic chatter.
TPI Selection by Cut Height
Use the dimension the blade sees — not overall part length. Published Lenox/Starrett-style shop ranges:
| Cut Height (in) | Recommended TPI | Typical Stock | Notes |
|---|---|---|---|
| < 0.25 | 18–24 | Sheet, thin tube, small flat bar | Fine pitch; watch chip packing |
| 0.25 – 0.5 | 14–18 | ½″ flat, thin wall tube | Variable 14–18 TPI common |
| 0.5 – 1 | 10–14 | 1″ round/square bar | General shop workhorse range |
| 1 – 2 | 6–10 | 1½″ bar, heavy wall tube | 8 TPI is a frequent primary pick |
| > 2 | 3–6 | Large structural, thick plate | Coarse pitch; flood coolant on steel |
Blade Speed (SFM / FPM) by Material
Bandsaw charts label rim speed as SFM or FPM interchangeably — both mean surface feet per minute at the blade. Bi-metal is the default for ferrous shop work; carbide-tipped runs higher on hard alloys; carbon is for wood and occasional light steel.
| Material | Bi-Metal SFM | Carbide-Tipped SFM | Carbon SFM | Coolant / Lube |
|---|---|---|---|---|
| Mild steel | 200–300 | 250–350 | 150–200 | Flood or mist cutting fluid |
| Stainless | 75–150 | 100–180 | 40–80 (not recommended) | Generous flood; avoid work-hardening rub |
| Aluminum | 300–500+ | 350–550 | 250–400 | Light fluid or wax stick; clear chips |
| Cast iron | 100–200 | 120–220 | 80–150 | Often dry; dust control for CI dust |
| Tool steel | 50–120 | 80–150 | 30–60 (short life) | Flood; slow feed; bi-metal minimum |
| Wood | 800–1500 | 1000–2000 | 2000–4000+ | Dry; carbon preferred for cost/speed |
Convert SFM to wheel RPM: RPM = (SFM × 12) ÷ (π × wheel diameter in inches). A 14″ wheel at 250 SFM ≈ 68 RPM.
Bi-Metal vs Carbide vs Carbon — Summary
Bi-metal (M42 high-speed steel teeth on a flex back) is the default for metal fabrication: good life on mild and stainless steel, moderate cost, wide TPI availability.
Carbide-tipped costs more upfront but wins on hard alloys, nickel grades, and production runs where downtime for blade changes is expensive. Allows higher SFM on difficult materials.
Carbon / flex-back is economical for wood, plastic, and occasional thin mild steel. Avoid for stainless, tool steel, and heavy production steel — teeth dull quickly and strip under load. Full comparison: Bi-Metal vs Carbide vs Carbon.
Coolant & Lubricant
On steel and stainless, cutting fluid extends blade life 2–3× versus dry cutting by reducing heat at the tooth tip and flushing chips from the gullet. Use flood coolant on horizontal production saws; mist or brush-applied fluid works on many vertical and portaband setups.
Aluminum needs chip clearing more than heavy lubrication — a light fluid or wax stick prevents gumming. Cast iron is often cut dry with dust collection. Never use water alone on steel without rust inhibitor; emulsion or straight oil per blade maker guidance.
If the blade turns blue, squeals without producing chips, or gullets pack solid, you are running too fast, too slow, or starved for fluid — see troubleshooting before changing TPI.
Product catalog note
TestTalkHQ’s affiliate CSV currently has no bandsaw blade listings — this guide and calculator pack focus on selection math and shop references. Blade SKUs will be added when catalog images and links are available; we are not substituting unrelated cutting tools (end mills, snips, etc.) in their place.