A power hacksaw coarse blade has how many teeth and is used for which metals?

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A power hacksaw blade’s tooth count determines how aggressively it cuts and how well it clears chips. A coarse blade has few teeth per inch, which means larger teeth take bigger bites. That design is ideal for rapid cutting through thicker sections or materials that can clog a finer blade, and it works well on metals that aren’t extremely hard or brittle. The metals listed as best fit—soft steel, cast iron, and bronze—benefit from this coarser action: soft steel can be cut quickly without excessive heat buildup, cast iron tends to shed chips and benefits from fewer teeth to prevent clogging, and bronze is machinable enough that a larger bite per tooth makes the cut efficiently.

In contrast, thinner or more delicate cuts, such as thin tubing or sheet metal, typically require more teeth per inch to produce a cleaner finish and to avoid tearing. Heavier, harder stock falls somewhere in between, often needing a blade with a different balance of tooth size and count. So the description with four teeth per inch for soft steel, cast iron, and bronze matches the coarse, high-bite action intended for those materials.