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comparison of Straight Flute Reamers and Spiral Flute Reamers

comparison of Straight Flute Reamers and Spiral Flute Reamers

2025-09-24

Straight Flute Reamer vs. Spiral Flute Reamer

Feature	Straight Flute Reamer	Spiral Flute Reamer
Flute Design	Straight grooves along the tool axis	Helical grooves, common angles 7°, 15°, 30°
Chip Evacuation	Limited chip removal, chips may clog	Smooth chip evacuation, chips flow backward or forward
Suitable Materials	Brittle materials such as cast iron, brass, bronze	Tough materials such as carbon steel, stainless steel, alloy steel, aluminum alloys
Surface Finish	General finish, more prone to burrs	Excellent finish, reduces burrs at hole entrance/exit
Machining Accuracy	For medium tolerance holes	For high-precision and fine-finish holes
Application	Economical choice for general reaming and shallow holes	Ideal for deep holes, through holes, and precision finishing
Cost & Tool Life	Simple design, lower cost, standard tool life	More complex design, higher cost, better stability and durability

Summary

Straight Flute Reamer → Best for brittle materials, shallow holes, and cost-sensitive applications.
Spiral Flute Reamer → Best for tough materials, deep or through holes, and high-precision finishing.