Hacksägen

Hacksägen, or hacksaw, is a hand tool consisting of a U- or C-shaped frame that holds a thin, replaceable blade under tension. The blade is typically 12 inches (300 mm) long, though shorter 6–8 inch blades are common in junior models, and may be changed to suit different materials. The teeth are along one edge and are designed to cut on the forward stroke. Blades are available with varying tooth-per-inch (TPI) counts for different materials: coarse blades (low TPI) for soft metals and thicker cuts; fine blades (high TPI) for hard metals or precise work; specialized blades exist for plastic or wood.

Frames come in fixed and adjustable designs. Adjustable frames allow different blade lengths and tensioning; junior hacksaws have smaller frames for tight spaces.

Operation: Secure the workpiece in a vise or with clamps. Install and tension the blade, ensuring teeth point toward the handle for forward-cutting. Use proper PPE; cut with even, straight strokes, feeding only with the teeth, not bending the blade. Use cutting fluid for metal; begin with a light scoring cut to guide the blade. For pipes or tubes, avoid binding by starting slowly and backing off if the blade binds.

Maintenance: Replace dull or broken blades promptly; keep the frame clean and tension adjusted to the blade's width.

Applications: Primarily metalworking and plumbing, including cutting steel bar, angle iron, conduit, pipes; can also be used for plastics and soft woods with appropriate blades.