Reciprocating Saw Blade Guide: How to Pick the Right Blade for Wood, Metal, and Demolition
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Quick answer: Pick a reciprocating saw blade by matching teeth per inch (TPI) to the material: 6 TPI for fast rough demolition, 10 TPI for general wood and nail-embedded wood, 14-18 TPI for clean cuts in metal and pipe, and 18-24 TPI for sheet metal and thin metal. Use a bi-metal blade for most jobs; use carbide grit for cast iron, tile, and masonry.
If you have ever stood in the tool aisle wondering which blade you actually need, this guide will sort it out in five minutes. We will cover the four blade attributes that matter, the blade types matched to each job, and the one set that covers the most common scenarios for homeowners and home mechanics.
1. Match TPI (Teeth Per Inch) to the Material
TPI is the single most useful spec printed on the blade. It tells you what the blade is built to cut:
- 6 TPI (coarse) — fast, rough cuts. Best for framing lumber, demolition, and pruning. Rips wood quickly but leaves a coarse finish.
- 10 TPI (general) — the everyday all-rounder. Handles wood, nail-embedded wood, and light metal.
- 14-18 TPI (fine) — clean cuts in metal pipe, conduit, channel, and sheet metal.
- 18-24 TPI (very fine) — thin metal, sheet metal, HVAC duct, exhaust work.
For most DIY work, a set that includes 6, 10, 14, and 18 TPI blades covers everything you will actually do.
2. Choose Bi-Metal or Carbide for the Job
Most blades you buy today are bi-metal: a flexible spring-steel body welded to a hardened high-speed-steel cutting edge. Bi-metal blades flex without snapping and last longer than old carbon-steel blades.
For tougher jobs (cast iron, tile, masonry, fiberglass), pick a carbide-grit blade. It cuts by abrasion rather than teeth, so it survives materials that would strip bi-metal teeth in seconds.
3. Match Blade Length to the Cut
Reciprocating saw blades come in 4", 6", 9", and 12" lengths. As a rule, the blade should be at least three inches longer than the material you are cutting. Use a shorter 4-6" blade for tight work like pruning or cutting pipe in a wall cavity; use a 9" blade for general demo and rough work; reach for 12" blades only when you need the extra reach for branches or thick stacks.
4. Use the Right Shank
Almost all modern reciprocating saws use the 1/2-inch universal shank (sometimes called the Sawzall shank). This fits Milwaukee Sawzall, DeWalt, Makita, Ryobi, Bosch, Ridgid, Porter-Cable, and most other major brands. If you own an older or specialty saw, double-check the shank before you buy.
5. Pick a Set, Not a Single Blade
A well-curated blade set covers the four TPI ranges above plus a demolition blade for the messy jobs. The Heydake 12-Piece Reciprocating Saw Blade Set is built around exactly that mix: wood, metal, and demolition blades in the most-used lengths, all on the universal 1/2-inch shank, packed in a slim case that fits in a drawer or a tool bag.
Reciprocating Saw Blade Buying Checklist
Before you check out, run through this quick list:
- Does the set cover 6, 10, 14, and 18+ TPI?
- Is every blade a bi-metal or carbide build (not old carbon steel)?
- Is the shank the universal 1/2-inch format for your saw?
- Does the set include at least one 9-inch demolition blade?
- Is the case organized so you can find the right blade fast?