HACKSHAW BLADE

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HACKSHAW BLADE

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Product Description

Product Specification :

Product Specification: Hacksaw Blade

A Hacksaw Blade is a fine-toothed cutting tool designed to be mounted in a hacksaw frame. It is primarily used for cutting metals (such as steel, aluminum, and copper) but is also effective on plastics and hardwoods. The blade's performance is defined by its material composition and tooth density.

1. Key Performance Metrics (TPI)

The most critical specification for a hacksaw blade is Teeth Per Inch (TPI). Choosing the correct TPI depends on the thickness of the material being cut:

TPI	Application	Material Thickness
14 - 18 TPI	Heavy-duty cutting	Large solids, thick steel bars, and heavy pipes.
24 TPI	Medium-duty/General	Medium-walled pipe, angle iron, and aluminum.
32 TPI	Fine-duty cutting	Thin sheet metal, tubing, and precision trim.

Rule of Thumb: At least three teeth should be in contact with the material at all times to prevent the teeth from snagging or stripping.

2. Material Categories

Material Type	Specification & Performance
Carbon Steel	Economical and flexible. Best for DIY/soft metals. Dulls quickly on hard steel.
High-Speed Steel (HSS)	Harder than carbon steel. Maintains a sharp edge longer and resists heat.
Bi-Metal	Industry Standard. A strip of HSS teeth electron-beam welded to a flexible spring-steel back. Shatterproof and long-lasting.
Tungsten Carbide	Used for extremely hard materials like ceramics, glass, or hardened steel.

3. Dimensional Standards

Length: Standard blades are 10 inches (250mm) or 12 inches (300mm) measured from pin-hole to pin-hole.
Width: Typically 1/2 inch (12.5mm).
Thickness: Usually 0.025 inches (0.63mm).
Pin Holes: Universally sized to fit standard adjustable hacksaw frames.

4. Tooth Geometry & Set

Wavy Set: The teeth are arranged in a "wave" pattern. This creates a kerf (cut width) slightly wider than the blade itself, preventing the blade from binding in the metal.
Raker Set: Teeth are set in a pattern of left-right-straight. This is common in lower TPI blades for faster clearing of metal chips.

5. Installation & Usage Tips

Direction: The teeth must point forward (away from the handle). A hacksaw cuts on the push stroke.
Tension: The blade must be tightened until it emits a high-pitched "ping" when plucked. A loose blade will wander and break easily.
Speed: Aim for 40–50 strokes per minute. Moving too fast generates excess heat, which softens the teeth and ruins the blade.