What is Spiral Flute Reamer

A spiral flute reamer is a precision hole-finishing tool designed to improve dimensional accuracy and surface finish of pre-drilled or bored holes.

1. Flute Shape: Spiral grooves similar to twist drills, available in left-hand spiral and right-hand spiral types.

2. Chip Evacuation:

   • Left-hand spiral flute reamer → Best for through holes, chips are pushed backward, avoiding scratches on the hole surface.

   • Right-hand spiral flute reamer → Best for blind holes, chips are pulled forward, preventing clogging at the bottom.

3. Cutting Stability: Compared with straight flute reamers, spiral flute reamers cut more smoothly, reducing vibration during operation.

4. Surface Quality: Produces a smoother and more precise hole wall due to continuous cutting action.

• Through holes → left-hand spiral flute reamer

• Blind holes → right-hand spiral flute reamer

• Workpiece materials: steels, cast iron, non-ferrous metals, depending on tool substrate and coating

In short, a spiral flute reamer is a reamer with helical cutting grooves that provides smoother cutting, better chip removal, and improved hole quality compared to straight flute reamers.