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Japanese hair shears for considered cutting choices

How to Read Thinning Shear Cut Ratios

Keep the percentage attached to the model that carries it.

By JapanShears EditorialUpdated

A stylist separates a clean subsection of visibly dense coarse hair with a comb and two ordinary clips while a closed generic shear rests nearby.
Generated editorial dense-hair sectioning scene. Texture does not set one tool or method; the cut ratio belongs to the specific thinner.
On this page
  1. A count can stay the same while the stated rate changes
  2. Another useful contrast: E-40 and SNT-40
  3. Use the figure to ask a better question

A maker’s cut ratio helps distinguish a thinner’s design. Keep that figure beside the model name and option suffix. It is useful buying information, but it cannot promise that the same percentage of a client’s hair will disappear in your next section.

Makers use terms such as cut ratio, cut rate and thinning rate. Retain their wording and range when comparing tools. If the reference does not explain the measurement method, we do not fill in an assumed test section or denominator.

A count can stay the same while the stated rate changes

The Yasaka YS-30 listing makes this clear. Its three options each have 30 teeth and a nominal six-inch size. Yasaka gives each design a separate range:

Exact local optionYasaka’s stated cut rateMaker reference
YS-30S7–10%YS-30S specification
YS-30W20–25%YS-30W specification
YS-30T30–35%YS-30T specification

Keep S, W or T in your notes and order selection. “A Yasaka 30-tooth thinner” leaves out the distinction you need. These figures also stay with these three models; they are not the rates of every Yasaka tool carrying 30 teeth.

The tooth anatomy guide identifies bodies, gaps and tip features. Those are separate fields from count, and the same-count comparison puts them alongside complete model builds.

Another useful contrast: E-40 and SNT-40

Both Joewell models have 40 teeth, yet their construction and maker statements differ.

ModelConstruction to compareMaker’s cut ratio
E-40Nominal 5.6 inches, symmetrical handle, Standard JOEWELL Blade and precision flat screw35% in Joewell’s E-series reference
SNT-40Nominal 5.9 inches, small tooth-tip grooves and dry-bearing screwLess than 5% in Joewell’s official 2024 catalogue

That contrast is a reason to investigate the designs, rather than sort all 40-tooth thinners into one group. The current Japanese SNT reference also identifies its 5.9-inch, 40-tooth build and describes the small tip grooves.

Use the figure to ask a better question

First name the intended change: weight removal, a particular texture or a blending task in the planned cut. Then compare the complete model against that brief. Hand, handle, reach and tooth form still matter when one published rate looks attractive.

For example, Joewell describes JGC-12 as a cut-and-thin design with 12 flat teeth and an 80% ratio in its model reference. That is a specific construction and role to discuss with your educator. It does not establish a rule that every 12-tooth tool shares that rate.

On hair, the section, placement, movement and sequence enter the result. Repeating a closure does not make a maker’s percentage an arithmetic recipe. For a comparison you can learn from, use the supervised thinner brief to agree the task and record what you observe.

The fine-hair guide helps separate strand texture from density before you decide whether removal belongs in the cut at all. Once the role is clear, return to the thinner buying guide for a shortlist you can explain.