Custom carbide straight and spiral reamers

Choosing the Right Reamer Flute Geometry: Straight, Right-Hand Spiral, and Left-Hand Spiral

Straight Flutes

Straight-fluted reamers are an all-around solution for many standard applications. They perform best in materials that break into small, manageable chips, such as bronze, cast iron, or brass. While these tools can be used in both blind and through holes, they are especially suited for jobs where cost-effectiveness and simplicity are priorities. However, spiral flute designs tend to outperform them in scenarios requiring chip evacuation or superior surface finish.

Right-Hand Spiral Flutes

In cases where the hole does not extend all the way through the material (blind holes), reamers with right-hand spiral flutes are a better option. These tools draw chips backward, out of the hole, helping prevent chip compaction at the base, which could lead to tool failure or part damage. Right-hand spirals are especially effective in softer, ductile materials and are capable of navigating features like cross-holes or keyways.

Left-Hand Spiral Flutes

Left-hand spiral reamers are designed to push chips forward and are the preferred choice for through-hole applications. Their design helps protect the cutting surface by moving debris away from the cutting zone. These reamers also shine when working with harder materials or when dealing with interrupted holes, as the chip flow direction reduces the chance of damage or tool binding.