How to Choose the Right Reciprocating and Jigsaw Blade

Pick the wrong blade and the job tells on you fast — snapped tangs, smoking teeth, a wandering cut that ruins the line. Match the blade to the material first, then nail the teeth-per-inch, the tooth material, and the length. Get those four right and the saw does the work instead of fighting you.

The whole decision starts with what you’re cutting. Clean wood, nail-embedded framing, thick metal, multi-material demo — each one wants a different blade. Choose blades by first identifying your material: use The Ax for wood or nail-embedded wood, The Torch for thick metal, and The Wrecker for multi-material demolition. After that, TPI fine-tunes the cut for speed versus smoothness.

TPI: The First Real Decision

Teeth-per-inch sets cut speed, cut smoothness, and how long the blade survives. The rule never changes: fewer teeth cut fast and rough, more teeth cut slow and clean. A 3 TPI blade tears through a tree root. A 24 TPI blade leaves a tidy edge on thin sheet metal.

Select the teeth per inch based on the application, ranging from 5 TPI for aggressive wood cutting to 24 TPI for thin metals. Here’s how the common ranges map out:

Material	TPI Range	Notes
Clean wood, roots, pruning	3 TPI	Aggressive, fast, rough cut
Nail-embedded wood	5 TPI	Demolition framing with hidden fasteners
Multi-material demo	6–11 TPI	Variable tooth for mixed materials
Metal, general	7–24 TPI	Fewer teeth for thick stock, more for thin
Metal, 1/4”–3/8”	10 TPI	Medium-thick metal
Metal, 3/16”–1/4”	14 TPI	Schedule 80 pipe, angle iron
Thinner metal stock	18 TPI	Thin-wall material

That nail-embedded category matters around here. Tearing out old stud walls, roofing, and framing in an aging Montana remodel means hitting hidden nails constantly — the exact scenario the 5 TPI demo blades are built for. Standard wood blades give up the moment they kiss a fastener.

For jigsaw work, the same logic holds at a smaller scale. A 4-1/8” 10 TPI bi-metal blade lasts longer than high-speed steel or carbon blades, combining the strength to cut metal with the durability to withstand impacts without breaking, producing clean, fast scroll cuts in wood and metal. Step up the tooth count — a 2-3/4” 14 TPI high-speed steel jigsaw blade handles finer, faster cuts in wood and similar materials.

Blade Families and Tooth Material

Milwaukee organizes reciprocating blades by job-name families, which makes the rack easier to read once you know them.

The Ax is the nail-embedded wood and demolition blade — 5 TPI, built with a plunge-start tip and reinforcement against hidden nails. This is the tear-out blade.

The Torch is the metal family. The Torch metal-cutting blades feature a tooth form optimized for the longest life and maximum durability, a Tough Neck engineered to protect against tang breakage, and a Grid Iron stamped honeycomb pattern throughout the body that greatly increases rigidity, making it the stiffest metal-cutting blade. The 6” 14 TPI Torch runs 14 teeth on a 1/2” universal shank in high-speed steel, and it’s ideal for making tough, straight cuts with a tooth design providing 2X more life than the previous generation. These blades chew through Schedule 80 pipe and angle iron.

The Wrecker is the multi-material demo blade for blind cuts through mixed material at 6 TPI.

Then there’s the bi-metal versus carbide question. Bi-metal costs less and works fine as a disposable blade for everyday cuts. Carbide costs more upfront but lasts dramatically longer and cuts material — like stainless steel — that bi-metal can’t touch. On tough, repeated cuts, the longer life offsets the higher price. For one-off demo, bi-metal’s the sensible pick.

Length and Profile

Length is simple math, and getting it wrong means a blade that buckles and wanders. Length should be at least 3 inches longer than the material width to ensure stability. Width of the material plus 3 inches is your minimum.

Reciprocating blades come in 4”, 6”, 9”, and 12” lengths. Jigsaw blades run far shorter — think 2-3/4” and 4-1/8”. Profile matters too: demolition blades use a thicker, taller body that resists twisting and holds a straighter cut, standard blades run traditional thickness, and scroll-cutting blades go low-profile for tight contours.

Shank Fit, Installation, and Warranty

Confirm the blade fits your tool’s clamp before anything else. Reciprocating blades use a 1/2” universal shank. Jigsaw blades use a universal tang — for example, the U-shank blade fits Milwaukee Jig Saw model 6256-6 and other popular brands.

Installation is one step: insert the blade shank into your tool’s blade clamp until it locks.

On the backing — there’s a three-year extended warranty on all Milwaukee reciprocating saw blades.

Frequently Asked Questions

What TPI should I use for nail-embedded wood? Use a 5 TPI blade built for demolition. The Ax is the family for wood or nail-embedded wood. Standard wood blades fail when they hit hidden fasteners, so a demo-rated 5 TPI tooth is the right call for tear-outs of old framing, stud walls, and roofing.

How long should my reciprocating blade be? Take the width of the material and add 3 inches — that’s your minimum. Length should be at least 3 inches longer than the material width to ensure stability. Common reciprocating lengths run 4”, 6”, 9”, and 12”. Too short and the blade buckles or won’t clear the cut.

Bi-metal or carbide — which is worth it? Bi-metal is the lower-cost, disposable choice that handles common cuts fine. Carbide costs more but lasts far longer and cuts stainless steel that bi-metal can’t manage. For repeated tough cuts, carbide’s longer life justifies the price. For occasional demo, bi-metal does the job.

What blade cuts Schedule 80 pipe and angle iron? A 6” 14 TPI Torch blade. It’s a metal-cutting blade with a tooth form optimized for long life, a Tough Neck tang that resists breakage, and a Grid Iron honeycomb body that resists buckling — built for tough, straight cuts in medium metal.

Will these blades fit my saw? Check the shank. Reciprocating blades use a 1/2” universal shank that fits standard reciprocating saws. Jigsaw blades use a universal tang and fit Milwaukee Jig Saw model 6256-6 along with other popular brands. Confirm compatibility with your specific tool before buying.

Is there a warranty on the blades? Yes. A three-year extended warranty covers all Milwaukee reciprocating saw blades.