Flat Comb

Reference sectionFlat Comb (フラットヘッド/溝なし, furatto heddo / mizo-nashi)

A flat comb is a thinning tooth pattern in which every tooth is the same height, width and spacing, so all teeth engage the hair at the same point in the closing stroke. Flat describes a construction, not a rate: the maker’s published figure for the exact model sets how much hair comes out.

Quick look

• What it is: A thinning tooth pattern where all teeth are the same height and width, evenly spaced
• Grip: Even engagement across the full width of the blade; the tooth geometry sets the bite
• Best for: Work where you want the same removal along the blade from a predictable pass
• Result: Depends on the model’s published cut rate; the pattern alone does not set it

Why it matters

The flat comb is exactly what the name suggests: teeth of equal height, width and spacing arranged in an even pattern. Every tooth meets the hair at the same moment during blade closure, and where the gaps are equal the same amount of hair passes through each one uncut. Inside one maker’s otherwise controlled family, that gives even removal across the section.

That predictability is the flat comb’s strength. There are no surprises inside the pattern itself. What the pattern cannot tell you is the rate: flat and grooveless constructions appear across a very wide span of published figures, and Joewell’s grooveless HXG range alone runs from approximately 15% to approximately 80%. Read the maker’s number for the exact model rather than the pattern name.

DetailWhere you will find it

Flat or grooveless teeth appear across many thinning-shear ranges, including salon starter kits and student scissor sets, because the uniform pattern is straightforward to teach. Many barber thinners also use them, where the goal is even bulk removal rather than subtle blending. Check the exact model rather than the category, because the same pattern name covers a wide rate span.

Watch-outsLimitations

Maker and educator accounts describe the uniform pattern as reading sharper at the boundary between thinned and unthinned hair than a graduated or stepped head, because the teeth meet the section together. That comparison has not been independently measured, and line visibility in practice depends on the model’s rate, the section, the placement, the angle and how many passes you take. On fine hair, test on an inconspicuous section before working near the surface, and consider pairing the tool with a softer profile for finishing passes.

Flat is also a naming trap in two directions: a catalog may use the word for a grooveless tooth tip, for a uniform tooth pattern, or for both. Where a maker marks a specific model 溝なし (mizo-nashi) or フラットヘッド, use that model’s own drawing and published rate.

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Source trailSources and limits

The construction is described from maker vocabulary: Joewell publishes a grooveless HXG range with per-model rates, Matsuzaki distinguishes a grooveless (FUZZY) head from its U-groove and V-groove marks, and ANS separates its grooveless series from its grooved series while stating that its rates are an in-house dry, no-tension comparison. This page adds no rate of its own.

What it cannot supply is a rate, a line-risk ranking or a hair-type prescription from the word flat. Count, spacing, groove absence, opposing blade, clearance, orientation, section and technique all move the observed result. Where a maker publishes no rate, record the value as unknown and strand-test the tool.

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