National Center for Construction Education & Research (NCCER) Plumbing Level 1 Practice Exam

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How many teeth per inch should a hacksaw blade ideally have?

24

32

The ideal number of teeth per inch (TPI) for a hacksaw blade typically depends on the type of material being cut as well as the thickness of that material. A blade with 32 teeth per inch is generally considered a versatile choice for cutting a variety of materials and thicknesses, making it well-suited for most plumbing applications.

This TPI provides a good balance between cutting speed and the quality of the cut, ensuring that the blade can effectively bite into the material without quickly dulling. A higher TPI, such as 40 or 48, is often used for cutting thinner materials or achieving a finer finish, while a lower TPI is better for thicker materials due to its ability to remove material more aggressively. Thus, the choice of 32 teeth per inch is optimal for general purpose use in plumbing tasks, wherein contractors need a balance of speed and precision.

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40

48

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