How to Change a Junior Hacksaw Blade

How to Change a Junior Hacksaw Blade

It is really easy to learn how to change a junior hacksaw blade. Having a sharp junior hacksaw is always a necessity especially if you want to make the cleanest cuts. This guide carefully explains how to change a junior hacksaw blade.

How to Change a Junior Hacksaw Blade

A junior hacksaw has a removable blade mounted in a metal frame. Just like any frame saw, the blade must be held tight in order to cut efficiently. A junior hacksaw blade has a small pin. The pin is designed to fit into two slots on the arms of the hacksaw.

One of the slots is located at the end of the frame far away from the handle while the other slot can be seen on a small metal bar on the handle. When you turn the thumb, the metal bar pulls the blade tight, stretching it in the frame.

Frequently Asked Questions

1. How to use a junior hacksaw?

  • Select the right blade for the material you want to cut
  • Secure the blade with the teeth facing upward
  • Keep the blade tight and the frame properly aligned
  • Cut using solid. Steady strokes directed away from you
  • Use all the length of the blade in every cutting stroke
  • Cut hard materials slowly than soft materials
  • Clamp thin, flat pieces that needs edge cutting
  • When cutting pipe, secure it in a vies before cutting.

2. Can a junior hacksaw cut through metal?

Junior hacksaws are mostly used for cutting through metal pipes or plastic tubes. A junior hacksaw’s blade is smaller than a regular one, so it can be used for more precise cutting.

3. What is TPI in hacksaw blades?

TPI in hacksaw blades simply means Teeth Per Inch. Hacksaw blades can be described by the number of numbers of TPI i.e. the blades can have 14, 18, 24, 32 teeth per 25mm (inch).

4. Can a hacksaw cut hardened steel?

Hacksaw blades can cut hardened steel and it is required of the user to use a bench vise to strongly hold the hardened steel while cutting.

5. What are the best hacksaw blades?

6. What are the two types of hacksaw blades?

  • The two types of hacksaw blades are Hardened hacksaw blades and Flexible hacksaw Blades.

    Hardened hacksaw blades are designed to cut high-grade tool steel. The steel is hardened throughout the entire blade as well as the teeth and the backing. This type of hacksaw blade I often referred to as all-hard blades. The hardened hacksaw blades maintain their sharpness and teeth but can be fragile and more prone to breaking.

    The Flexible hacksaw blades only have hardened steel on the teeth of the blade but the backing is a flexible metal sheet. The flexible hacksaw blades are also called bimetal hacksaw blades. They are less fragile than the hardened hacksaw blades.

7. How would you replace a blade in a hacksaw?

  • Loose the wing nut close to the hacksaw’s handle. Loose the nut by rotating it counter-clockwise. Make sure the wing nut is loose enough so that you can remove the old blade from the frame.
  • Remove the old blade from the frame by lifting it off the blade keeping pins at each end of the frame
  • Fix a new blade in the blade retaining pins and make sure the blade’s teeth point away from the handle
  • Screw up the wing nut by spinning it clockwise until the blade is tight.
  • Make a test cut on a scrap metal in a vise. Tighten the wing nut again if the blade flexes during the cut.

How to Change a Junior Hacksaw Blade Step by Step

Step 1: Remove the Blade

Hacksaw with a thumb wheel: To remove the blade on a hacksaw with a thumb wheel, find the thumb wheel and turn it anti-clockwise direction. The thumb wheel controls the blade tension. When you turn the thumb wheel anti-clockwise direction, it pushes the metal bar forwards thus releasing the blade and letting it drop out of the slots.

Hacksaws without a thumb wheel: Some designs of junior hacksaw have a simple metal frame that holds the blade in a similar way, by using two slots on the frame’s arm where the blade fits.

Step 2: Compress Frame

To take away the blade, hold the hand in your dominant hand and put the other hand over the end of the saw, while holding the blade loosely. Use your two hands to push both sides of the frame inwards towards one another. This will make the blade to lose and slacken.

Step 3: Maintenance

Before fixing the new blade, clean the hacksaw with a clean cloth that has a little lubricant. By doing this, you can get rid of debris and grime and keep your junior hacksaw in a good condition.

Step 4: Install the new blade

Rotate the thumb wheel in an anti-clockwise direction until you place the blade in the two slots on the body of the saw.

Then put the blade in the frame with the teeth pointing away from the handle, towards the end of the saw.

You can easily do this when the junior hacksaw is sitting upside down.

When the blade is placed, tighten the blade by spinning the thumb wheel in a clockwise direction. The metal bar will be pulled backwards, stretching the blade taut in the frame.

If you have a saw with a protective cover that extends to the end of the blade, make sure it is replaced when is renewed.


There you have it, the comprehensive guide on how to change a junior hacksaw blade. The steps aligned above will put you through how you can install a new blade to your junior hacksaw.  If followed exactly, you can change your junior hacksaw with ease.

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