Reciprocating Saw Blade Guide: Which Blade Cuts What
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A reciprocating saw is only as good as the blade you put in it. The motor provides the stroke. The blade does the cutting. Wrong blade for the material and you're either burning through blades in minutes or making cuts that take forever. The variables are blade length, teeth per inch (TPI), tooth pattern, and blade material. Each combination is built for a specific job. This guide covers what works for each material so you stop guessing at the hardware store.
How TPI Determines What You Cut
TPI is the single most important number on a recip saw blade. Low TPI (3 to 6) cuts fast and rough. The big teeth take aggressive bites, clear chips quickly, and rip through wood, nail-embedded lumber, and tree limbs. High TPI (14 to 24) cuts slower and smoother. The fine teeth handle metal, thin-wall pipe, and sheet goods without snagging.
The general rule: at least 3 teeth should be in contact with the material at all times. On a 2x4 (1-1/2 inches thick), a 6 TPI blade has 9 teeth engaged, which is plenty. On 1/16-inch sheet metal, that same 6 TPI blade has less than 1 tooth in contact, which grabs, vibrates, and destroys the cut edge. You'd want 18 to 24 TPI for that.
Wood Blades
Standard wood blades are 6 to 9 inches long, 5 to 6 TPI, and made from HCS (high-carbon steel). They're cheap ($2 to $4 each), cut fast, and handle framing lumber, sheathing, and dimensional stock. They dull quickly on nails and screws. For clean wood without fasteners (pruning, rough carpentry), HCS is fine.
For demolition work where the wood might have nails, screws, or staples, step up to a bi-metal blade. Bi-metal blades have HSS (high-speed steel) teeth welded to a flexible carbon steel body. The HSS teeth survive nail strikes that would destroy HCS teeth. Demolition bi-metal blades in 6 to 10 TPI handle everything you find in a wall during a remodel: wood, nails, drywall, sheathing.
Metal Blades
Metal cutting blades run 14 to 24 TPI and are always bi-metal or carbide-tipped. For mild steel, copper, and aluminum, 18 TPI bi-metal works well. For cast iron, stainless, and hardened steel, carbide-tipped blades last 10 to 20 times longer but cost $8 to $15 each compared to $3 to $5 for bi-metal.
Blade length matters for metal. Use the shortest blade that reaches through the material. Long blades flex under the cutting pressure and deflect, giving you a curved cut. For pipe, the blade should extend 2 to 3 inches past the pipe diameter. For flat stock, match the blade length to the thickness plus an inch. Diablo, Lennox, and Milwaukee Torch blades are the names you'll see recommended by plumbers and HVAC techs.
Specialty Blades
Pruning blades (3 to 5 TPI, aggressive tooth set) cut green wood and branches faster than wood blades because the wide tooth set clears wet chips that would clog a standard blade. Tree service pros keep a stack of these.
Carbide-grit blades have no teeth at all. Instead, a tungsten carbide coating on the edge grinds through cement board, fiberglass, brick, and tile. They're slow but they cut materials that would destroy any toothed blade.
Long-reach blades (12 to 16 inches) handle deep cuts in walls, timbers, and posts where standard 6 to 9-inch blades can't reach. The trade-off is more blade flex, so guide the cut carefully and don't force it.
Getting the Most Life from a Blade
Let the blade do the cutting. Pushing hard doesn't speed things up; it heats the blade and dulls the teeth. Keep the shoe (baseplate) pressed firmly against the workpiece to minimize vibration. Match your speed to the material: full speed for wood, medium speed for metal (the slower speed reduces heat buildup). When a blade stops cutting and you're compensating with pressure, it's done. Swap it out. A dull blade generates heat, not cuts.
Frequently Asked Questions
Can one blade cut both wood and metal?
Demolition blades (8 to 10 TPI bi-metal) are the best all-around compromise. They handle nail-embedded wood, light metal, and mixed materials. They won't cut clean wood as fast as a 6 TPI wood blade, and they won't cut thick metal as cleanly as an 18 TPI metal blade, but for demo work where you're cutting through whatever's in the wall, they're the go-to.
How many cuts does a recip saw blade last?
It depends heavily on the material. A bi-metal demo blade lasts 20 to 50 cuts through 2x4 with nails. A carbide-tipped blade in the same application might last 200+. In clean wood, an HCS blade handles 100+ cuts before dulling noticeably. Track how the blade is performing, not how many cuts you've made.
Do all recip saw blades fit all recip saws?
Almost all. Modern recip saws use a universal 1/2-inch tang (the part that slots into the blade clamp). Blades from any major brand fit any modern saw. Very old saws from the 1980s or earlier might use a proprietary tang. Check your saw's clamp before buying in bulk.
Are carbide-tipped blades worth the extra cost?
For metal cutting, absolutely. A $12 carbide blade that makes 200 cuts costs less per cut than a $4 bi-metal blade that makes 30. For wood-only cutting where nails aren't present, carbide isn't necessary. Save it for the hard stuff.