Hack saw blades are a fine-tooth blade under tension in a frame, used for cutting materials such as metal or bone.

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Is there more than one style of frame for Hack saw blades?

Hack saw blades could be used in many different frames. The most common frame is a pistol grip with a metal arch that can be tightened putting tension on the blade allowing for a cleaner cut. Wooden handles (like on small garden tools) are often attached to a frame, replacing the pistol grip. Panel hacksaws eliminate the frame allowing the saw to cut any length and not being restricted by the frame. Junior hacksaws are a small variant that may just hold the blade with no tension.

Is there a proper direction to cut with hack saw blades?

Proper cutting direction using hacksaw blades is determined by the direction the teeth face. One edge of the blade has teeth that face the same direction. The blade can cut in either a push or pull direction depending on which direction the teeth face. If the teeth face away from the handle it will cut on the push. If the teeth face toward the handle it will cut on the pull.

Will any hack saw blade cut all materials?

Hack saw blades are designed to cut different material. Typically this is determined by how many teeth per inch the hack saw blade has. The fewer teeth per inch (10 teeth per inch) would be designed to cut softer material even wood. The more teeth per inch, known as TPI, and the easier it is to cut stronger metals. A 32 TPI hacksaw blade would make a smooth cut in strong steel. Hack saw blade come in many TPI variations.

Why do hacksaw blades have variable tooth pitches?

Hacksaw blades have variable tooth pitches for two reasons. First the variable pitch reduces vibration in the push or pull cut. Second the variable pitch makes the blade cut more efficiently reducing fatigue on the user.