ScissorPedia

Ken-ba (剣刃) Cross-Section

Blade cross section
Blade-geometry instrument

Record line, section, edge, and spatial curve independently

Japanese and maker vocabularies often distinguish these axes; no exhaustive national menu is assumed. Apply to Ken-ba (剣刃) Cross-Section
SECTION ≠ EDGE
Plan-view line Each blade section Edge grind Spatial curve
  1. 01 Line Record plan-view curve, zones, radius basis, and blade length.
  2. 02 Section Describe the body profile and pairing of each blade half.
  3. 03 Edge Keep grind, finish, honing, and serration separate from section.
  4. 04 Spatial curve Name plane, direction, extent, and any vertical or whole-blade curve.

Do not inferHamaguri, sword, flat, convex, concave, or one R value cannot define every geometry axis or predict performance.

Four-axis geometry record · Ridge-like section term

Ken-ba needs the ridge and blade pairing mapped

A thicker ridge- or mountain-shaped section cue does not prove one wedge, force, technique, hair match, or edge grind.

  1. 01 Side / plan view Open field

    Blade line

    Ken-ba does not establish the longitudinal blade line.

    Leave openHeel-to-tip path, curve, width, and transition remain open.

    This route does not settle the field; record it separately.

  2. 02 End-on slice Maker-local

    Cross-section

    A thicker ridge- or mountain-like end-on profile is the family cue.

    Leave openFace angles, ridge height, symmetry, slice position, and one- versus two-blade use remain model-specific.

    Keep the term attached to the maker, model, language, and dated source.

  3. 03 Magnified working edge Open field

    Edge / grind

    A ridged body section can carry different final edges.

    Leave openGrind, finish, serration, condition, and service construction remain open.

    This route does not settle the field; record it separately.

  4. 04 Declared axis + view Source-scoped

    Spatial curve

    Pair a labeled end-on slice with a side view of ridge extent.

    Leave openBlade half, slice location, heel-to-tip span, scale, and drawing datum remain open.

    The route supports this vocabulary, within the cited source boundary.

Orientation aid—not a tracing template. Curves, planes, spacing, and proportions are deliberately non-dimensional.

  1. IdentityMaker + exact model

  2. EvidenceDated source + declared view

  3. Open fieldsKeep every unsupported detail unknown

Description

Ken-ba (剣刃) is a blade cross-section that rises to a ridge in the middle, like a sword. The thicker section makes the blade stiffer and gives a firm cut.

Ken-ba (剣刃)—Sword Cross-Section

Ken-ba (剣刃) is a sword-like blade section that rises to a ridge, giving a thicker, stiffer construction than a flat or clam-shell profile. Makers describe the added section as a way to increase rigidity and carry cutting force toward the tip, and they publish one-sided and two-sided pairings. The label does not fix the edge, the partner blade, the technique or the mass.

Quick look

  • Profile: The blade rises to a ridge in the middle, like a sword (剣, ken), so the section is thicker than hamaguri-ba.1
  • Sub-types: Kata-kenba (片剣刃, one blade with sword profile + one standard) and ryo-kenba (両剣刃, both blades with sword profile).1,2
  • Feel: a firm, solid cut from the thicker, stiffer section.1
  • Notable maker: Naruto Scissors.2

Why it matters

Ken-ba gives the blade a sword-like ridge down the middle. The extra thickness makes the blade stiffer, and makers describe a firmer, more solid cut through heavy sections.1

The two sub-types offer different balances of power and feel:

  • Kata-kenba (片剣刃): One blade carries the sword profile while the other uses a standard or hamaguri-ba cross-section. This creates an asymmetric pair where the sword blade drives the cut and the standard blade guides it. It gives a firm cut without giving up all of the smoothness of a conventional blade.1,2
  • Ryo-kenba (両剣刃): Both blades carry the sword profile, giving both halves the thicker section. Makers position it for work where a firm close matters more than versatility.1

Technique map

  • Heavy blunt cutting: Makers describe the thicker section as giving a firmer cut through dense sections. Test the exact model rather than the label.1
  • Barbering: The firmer close is positioned for comb-guided transitions and bulk removal on thick hair.1,2
  • Thick or resistant hair: Naruto describes its sword-shaped blade as suited to hard bristles or thick panels. That is the maker’s positioning for its own range, not a rule for every sword-marketed shear.2
  • Slide cutting: Possible with a one-sided sword pairing where the partner blade provides some glide, but confirm it on the maker’s drawing rather than assuming it.1

Usage notes

  1. Where a maker publishes a one-sided sword pairing, that asymmetric construction is one option to compare. Ask which half carries the ridge and what the partner blade is.1,2
  2. Reserve a two-sided sword pairing for work where a firm close matters more than versatility, and check its mass in the hand.1
  3. Assess the exact model against the hair in front of you; the section name alone does not prescribe a hair type.1

Maintenance

  • Ken-ba requires a sharpener who understands the ridged section and can preserve the symmetric or asymmetric grind as designed.1
  • Ask how the ridge and each face will be preserved. Do not assume a flat stone or a convexing system is right for the model.1
  • Oil the pivot and interior faces on the maker’s schedule; debris on the bearing surfaces shows up as a rough close.1

Sources and limits

Maker pages support a design rationale of added thickness and stiffness toward the tip; they publish no force multiplier, no universal section diagram and no technique gate. Ridge extent, edge grind, partner blade and mass are model-specific and belong in the record for the exact shear. No evidence located in this pass makes a sword-marketed shear inherently suitable or unsuitable for a given hair type, and the one-sided and two-sided terms are trade vocabulary rather than a standardized taxonomy.

See Also

Best shears for beginners →

References

Sources

2 sources
  1. 🇯🇵 SisRma — Scissor Information Portal (industry reference)
  2. 🇯🇵 Refun Scissors — Pre-owned Japan (marketplace)

Source scope and limitations are stated on the page. External links open in new tabs.

Quick clarifications

Frequently Asked Questions

3 answers you can open one at a time
What is the difference between kata-kenba and ryo-kenba, and which should I choose?

Kata-kenba (片剣刃) puts the ridged sword section on one blade only (usually the moving blade); the opposing blade uses a standard or hamaguri-ba cross-section. Ryo-kenba (両剣刃) gives both blades the thicker section. Makers describe a one-sided pairing as keeping some glide, because the partner blade can be a standard or hamaguri-ba construction, while a two-sided pairing gives both halves the firmer close. Naruto positions its sword-shaped blade for hard bristles or thick panels, so a two-sided pairing suits work where that firmness matters more than versatility. Compare the two constructions on named models, check the mass in the hand, and reserve a two-sided pairing for dedicated heavy-cutting scissors in a rotation rather than as an all-purpose tool.

How does ken-ba feel different from hamaguri-ba?

Hamaguri-ba presents a convex outer face over a hollow-ground inner face and glides through hair. Ken-ba rises to a ridge in the middle, so the blade is thicker and stiffer and the cut feels firmer.

Can a kata-kenba scissor be used for slide cutting?

With limitations. In a one-sided pairing the partner blade may be a standard or hamaguri-ba construction, which gives the pair some glide. Treat slide capability as a model-level question. The maker’s drawing, edge grind and partner blade decide it, and no section name settles it either way. If slide cutting is a large part of your work, compare specific models before choosing.

Community notes

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Last updated: September 28, 2026 · by
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