ScissorPedia

Dan-ba (段刃) 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 Dan-ba (段刃) 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 · Stepped section term

Dan-ba belongs in the end-on section record

A stepped or beveled section cue can be retained without inferring one angle, edge finish, technique, or service method.

  1. 01 Side / plan view Open field

    Blade line

    Dan-ba does not establish the heel-to-tip blade line.

    Leave openLongitudinal 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 stepped or flat-faced end-on profile is the route-specific cue.

    Leave openFace count, angles, datum, slice location, thickness, and partner blade remain model-specific.

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

  3. 03 Magnified working edge Open field

    Edge / grind

    The body step does not settle the final working edge or finish.

    Leave openEdge planes, polish, 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

    Compare identified end-on slices from the same blade zone.

    Leave openSlice location, orientation, scale, which blade, 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

Dan-ba is Japanese trade vocabulary for a stepped, flat-faceted blade section. Verify the exact model's planes, angle, edge, partner blade and service route.

Dan-ba (段刃)—Stepped / Beveled Cross-Section

Dan-ba (段刃) is Japanese trade vocabulary for a stepped, flat-faceted blade section rather than a continuous convex face. Current makers use it for blades that present flat planes to the hair or comb, while the number of planes, their angles and the shoulder dimension stay model-specific. The term describes a section, not a sharpening method, a nationality or a technique result.

Quick look

  • Profile: The outer face is built from flat planes that meet at a visible “step” (段, dan) rather than one continuous curve. The number of planes and their angles are model-specific.1
  • Sharpening: A sharpener who preserves the existing planes can often work on flat equipment; no standard fixes the angle or shoulder dimension, so ask for the model’s original geometry.1
  • Usage: A maker or trade description, not a national standard. Dan-ba is not inherently a German or European construction, and no evidence ranks it by ease of service.1
  • Stated use: Some makers position flat-faceted models for blunt and comb-guided work. That is a model-level statement, not a property of the section name.1

Why it matters

Dan-ba is Japanese trade vocabulary for a stepped, flat-faceted section, and current makers use it for blades that present flat planes rather than one continuous convex face. Depending on the maker, a flat face meets one or more ground planes at a step that stays visible along the blade. Some makers position flat-faceted models for blunt lines, one-length cuts and scissor-over-comb, but that is a model-level statement rather than a property of the section name. If you want the edge to hold hair, look for a micro-serrated finish on the exact model.1

Because the outer face is flat-faceted rather than a continuous curve, a sharpener who keeps those planes can often work on flat equipment; a convex model instead needs a provider who preserves the existing curve. Price and turnaround still depend on the pair and the provider.1

Technique map

  • Blunt cutting: Commonly used for clean perimeter lines.1
  • Scissor-over-comb: Consistent closing suits rapid, repeated strokes.1
  • Slide cutting: Depends on the finish. A polished flat bevel and a micro-serrated one release hair differently, so check the exact model rather than the section name.1

Usage notes

  1. Dan-ba blades can carry a polished or a micro-serrated edge. Check the maker’s wording for the exact model.1
  2. The flat blade surface is prone to showing scratches; wipe and oil regularly to maintain appearance and prevent corrosion.1
  3. Moving between sections changes how a pair feels in the hand. Allow time to adjust before judging a model you have not used before.1

Maintenance

  • Flat whetstones, diamond plates and standard sharpening systems can reproduce a flat-faceted outer face where the sharpener preserves the existing planes. Confirm the service route for the exact model.1
  • Preserve the model’s original plane count and angles as far as the maker publishes them. No standard fixes a universal bevel angle for dan-ba.1
  • The distinct step should remain visible after sharpening; if it disappears, the geometry has been compromised.1

Sources and limits

The section is defined by maker and trade usage rather than by a standards body. No source located in this pass fixes the number of planes, the plane angle or the shoulder dimension, and no evidence ranks the section by ease of sharpening, durability or technique fit. Statements about blunt, comb-guided or slide work stay attached to the named models that publish them. Ask the maker or a qualified provider for the model’s original geometry before any grinding.

See Also

Best shears for beginners →

References

Sources

2 sources
  1. 🇯🇵 SisRma — Scissor Information Portal (industry reference)
  2. 🌐 Joewell Scissors — Official Japan (manufacturer official)

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 does the "step" in dan-ba look like, and how does it affect the cut?

Hold a dan-ba blade at a low angle under light and sight along the face from tip to heel. You will see a flat primary surface running most of the blade width, then a distinct angle change—the step—where the geometry shifts to the secondary bevel before the cutting edge. This transition is visible as a line parallel to the edge and is the diagnostic feature that distinguishes dan-ba from hamaguri-ba (which has no such line—just a continuous curve). Whether the edge holds hair depends on its finish. Jaguar, for example, says its micro-serrated edges stop hair slipping.

How does dan-ba sharpening differ from hamaguri-ba sharpening?

Dan-ba describes a flat-faceted outer face, so a sharpener who preserves those planes can often reproduce them on flat equipment. No standards body fixes the number of planes, the angle or the shoulder dimension, so ask the maker or a qualified provider for the model’s original geometry before any grinding. Hamaguri-ba is a continuous convex outer face, and Hikari states that machine or self-taught grinding outside its method can destroy its profile, so a convex model needs a provider who preserves the existing curve. That is a maker service statement, not proof that every convex blade needs one particular stone system. Whether flat equipment is suitable depends on the exact model’s construction and service history, not on the section name. Price and turnaround still depend on the pair and the provider.

When would a professional stylist choose dan-ba over hamaguri-ba?

Base the choice on the exact model’s construction, stated use and service route rather than on the section label. Joewell describes its flat single-bevel face as able to sit against the hair or comb, and a polished flat bevel behaves differently from a micro-serrated one, which is made to grip hair rather than release it. A flat-faceted blade is not automatically a poor choice for slide work, because release depends on the finish, the blade line, the pair and the tension. Compare named models under the same conditions, and treat any claim that one section is always better as unverified.

Community notes

Comments & questions

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Last updated: September 28, 2026 · by
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