For cutting cast iron or soft steel, the...

🔍 Key Concepts

• Material hardness and thickness: Cast iron and soft steel are harder than materials like aluminum or brass, but still commonly cut with standard hacksaw blades. • Tooth pitch vs. material: Fewer teeth per inch (TPI) = coarser blade for harder/thicker stock; more TPI = finer blade for thin or delicate material. • Minimum teeth in contact: Safe cutting usually requires several teeth in contact with the work at the same time to avoid tooth breakage.

💭 Think About

• Think about which TPI range is typically recommended for general cutting of steel bar or pipe, not very thin sheet metal. • Ask yourself: for harder materials, do you want each tooth to take a bigger or smaller ‘bite’? How does that relate to having more or fewer teeth per inch? • Consider what would happen if you used a very fine blade (many teeth per inch) on thick, relatively hard stock like cast iron or soft steel—would it cut quickly and resist clogging, or tend to dull and bind?

✅ Before You Answer

• Check typical recommended TPI ranges for cutting steel bar, angle iron, or pipe, as opposed to thin sheet metal or tubing. • Verify which of the options represents a coarse-to-medium tooth pitch rather than an extremely coarse or extremely fine one. • Ensure that with your choice, at least 2–3 teeth would be in contact with the workpiece at all times for a standard cross‑section of cast iron or soft steel.

For cutting cast iron or soft steel, the proper hacksaw blade should have __________.

14 teeth per inch

18 teeth per inch

24 teeth per inch

32 teeth per inch

🔍 Key Concepts

💭 Think About

✅ Before You Answer