BAHCO HACKSAW BLADE - 18T FOR PLASTIC, 24T FOR METAL

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That is a solid general rule of thumb for Bahco Sandflex (Bi-Metal) blades, but the "best" choice often depends more on the thickness of the material than the material type itself.

Why 18T for Plastic?

Plastic is relatively soft. If you use a very fine blade (like 24T or 32T), the friction can heat the plastic, causing it to melt and clog the small teeth.

The 18T advantage: The larger gaps (gullets) allow the plastic "chips" to fall away without gumming up the blade. It also cuts much faster through thick PVC or ABS pipes.

Why 24T for Metal?

When cutting metal, the most important rule is the "3-Teeth Rule": you should always have at least 3 teeth in contact with the material at all times.

The 24T advantage: If you use an 18T blade on thin metal, the teeth are so far apart they can "straddle" the edge of the metal, causing the saw to catch, jar, or even snap a tooth. The 24T provides enough teeth-per-inch to glide smoothly through most standard metal thicknesses.

Pro-Tips for Bahco Sandflex Blades

Direction Matters: Ensure the teeth are pointing forward (away from the handle). Hacksaws are designed to cut on the "push" stroke.
Tension is Key: Bahco Sandflex blades are Bi-Metal (spring steel back with HSS teeth). They are virtually unbreakable, so you can tension them much tighter than old-school carbon blades for a straighter cut.
The 18T Exception: If you are cutting very thick metal (like a solid 1-inch steel bar), an 18T blade is actually better because it removes more material per stroke and won't overheat as quickly.