Hacksaw Frame

Quick Answer: A hacksaw frame is a steel bow that holds a thin, replaceable hacksaw blade under tension between two pins. Fitted with a suitable blade, the hacksaw frame cuts metal rod, bar, tube and plastic pipe by hand.

Frame, Tension and Blade

The frame does not cut on its own; it keeps a narrow, hardened blade straight and taut. A wing nut or screw at the front draws the pins apart until the blade rings when plucked, and that tension is what stops the blade bending sideways and wandering off the marked line. Frames are made from tubular or flat steel, and many can be lengthened or shortened to accept more than one blade length. The blade length this frame takes, and whether a blade comes with it, can be confirmed with LabEquip.

Blade choice decides the finish. Blades are graded by teeth per inch: coarse blades clear chips quickly in thick, solid bar, while fine blades are needed for thin tube and sheet. A useful workshop rule is to keep at least three teeth in contact with the section being cut, otherwise the teeth catch on a thin wall and strip.

The blade must be fitted with the teeth pointing away from the handle, because a hacksaw cuts on the forward stroke. Work held low and tight in a bench vice cuts faster and more squarely, and burrs left on the cut end are removed with files.

Specifications

Applications

• Cutting mild steel rod and flat bar to length in fitting and fabrication practicals
• Trimming copper, brass and aluminium tube for physics and plumbing projects
• Cutting PVC conduit and plastic pipe in electrical and water-supply training
• Sawing threaded rod and bolts to length for apparatus and fixtures

Care & Handling

• Ease the blade tension slightly when the saw will not be used for a while.
• Use long, steady strokes over the full blade length and lift the pressure on the return stroke.
• Slow down and support the offcut as the cut finishes so the blade does not snap or the piece fall.
• Replace blunt blades or blades with missing teeth rather than forcing them.

Why Choose LabEquip

Fitting, plumbing and electrical training workshops, school technology rooms and technicians who make up rods and fixtures use a hacksaw frame almost daily. LabEquip carries it in its general lab products section; tell us the blade length and quantity you need through the contact page.

Frequently Asked Questions

Which way should the hacksaw blade teeth face?

Away from the handle, pointing forward. A hacksaw cuts on the push stroke, so a blade fitted backwards cuts slowly, clogs and wears quickly.

How tight should the blade be?

Tighten the wing nut until the blade feels firm and gives a clear note when plucked, then stop. A slack blade twists and wanders; an overtightened one can pull out a pin or snap.

Which blade should I use for thin tube?

A fine-tooth blade, so that at least three teeth are touching the thin wall at any moment. Coarse teeth straddle the wall, catch and break off.

Why do my blades keep breaking?

Common causes are a slack blade, twisting the frame during the stroke, pressing too hard, work that moves in the vice, or rushing the end of the cut. Keep the frame upright and use steady, even strokes.

Can a hacksaw cut plastic pipe?

Yes. Fine or medium blades cut PVC and other plastic pipe cleanly. Support the pipe close to the cut and remove the soft burr afterwards with a file or knife.

Can a hacksaw cut hardened steel?

Ordinary blades are meant for mild steel and non-ferrous metals. Hardened steel, such as old files or springs, blunts them quickly and is better cut with an abrasive disc by a trained user.

Last Updated: September 2026