Edge Types
Illustrations are navigation markers, not technical evidence. They do not establish exact geometry, material identity, finish or coating identity and properties, adjustment settings, coating colour, hair classification, tooth pattern or removal rate, mechanism, fit, diagnosis, origin, performance, or result.
Keep the edge term attached to geometry and service
An edge label becomes useful only when its maker wording, host blade, finish, and service route are known. Apply to Edge Types
TERM ≠ SERVICE METHOD
- 01 Record the term Preserve the exact maker and model wording.
- 02 Locate the edge Identify the blade half, section, line, and any serration.
- 03 Trace its condition Keep sharpening, damage, coating, and inspection history.
- 04 Choose service Ask how the provider will preserve the original geometry.
Do not inferPolish, shine, feel, or a marketing label cannot diagnose an edge geometry or authorise a sharpening method.
Keep the four geometry fields apart
An edge-family label belongs in one box. It cannot silently fill the blade line, body section, or spatial curve.
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01 Side / plan view Open field
Blade line
The edge label does not supply the heel-to-tip path.
Leave openStraight, willow, bamboo-leaf, radius, and measured zone remain open.
This route does not settle the field; record it separately.
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02 End-on slice Open field
Cross-section
The supporting blade-body section is a separate field.
Leave openEnd-on profile, inner relief, partner blade, and dimensions remain open.
This route does not settle the field; record it separately.
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03 Magnified working edge Source-scoped
Edge / grind
This hub compares maker-used outer-surface and finish vocabulary.
Leave openPlane count, radius, angle, polish, serration, and condition need model evidence.
The route supports this vocabulary, within the cited source boundary.
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04 Declared axis + view Open field
Spatial curve
A photograph is useful only when its viewpoint is declared.
Leave openSide, outer-face, inner-face, end-on, magnification, and scale remain open.
This route does not settle the field; record it separately.
An edge label is one field in a shear specification. It can help describe the outer surface near the cutting edge, but it does not by itself rank sharpness, glide, force, durability, price, maintenance, user level, or technique.
Start with the surface
What each label can—and cannot—tell you
These are orientation cues. The exact model and its maker documentation remain the evidence.
Outer-surface wording
Convex
- Tells you
- The maker is describing an outwardly rounded outer grind.
- Does not prove
- One angle, one inner face, low cutting force, a required technique, or one service method.
Loose trade wording
Semi-convex
- Tells you
- The catalogue places the grind somewhere between an obvious flat facet and a continuous rounded surface.
- Does not prove
- Which planes or curves are present, how they are finished, or that this is a standardized midpoint.
Visible-plane wording
Beveled
- Tells you
- One or more visible flat ground planes lead toward the cutting edge.
- Does not prove
- Serration, toughness, effort, price, user level, or whether the model can support a particular technique.
Diagram boundary: the profile marks are deliberately non-dimensional. They show vocabulary—not an angle, radius, section drawing, or sharpening target.
Read the fields separately
- Blade line: record the plan-view path, such as straight, willow, bamboo-leaf, or a maker-specific curve.
- Outer surface: keep convex, semi-convex, beveled, or other wording attached to its maker and exact model.
- Edge finish: record polish, honing, micro-serration, or other finish independently.
- Whole construction: add the blade section, inner relief, pairing, tension, material, condition, and service history.
This separation matters because current maker catalogues combine these fields differently. JAGUAR, for example, publishes polished and micro-serrated flat-angle models, while its SILVER LINE combines semi-convex wording with hollow grinding and honing. JOEWELL uses its own flat single-bevel, Convex PRO, and Convex Shape categories. Those catalogues provide model-level examples, not one industry-wide ladder.
What a visual can do
A side photograph or non-dimensional diagram can orient you to a visible surface transition. It cannot establish the angle datum, hidden inner relief, steel condition, finish history, or the force required in use. Keep the model page, matched photographs, and service record together.
Related topics: Blade Types · Blade Cross-Section Geometry · Sharpening & Maintenance · Scissor Maintenance guide
Sources Reviewed
5 scoped sources behind this entry- Primary Joewell Scissors — Official Japan (Maker-local flat single-bevel, Convex PRO, Convex Shape, sword, and concave vocabulary)
- Primary Hikari Scissors — Official (Hikari's description of its own convex construction)
- Direct Jaguar Scissors ABC (Maker definitions for convex grinding, classic flat-angle blades, and micro-serration)
- Direct Jaguar PRE STYLE (Model-line examples separating polished and micro-serrated finishes)
- Direct Jaguar SILVER LINE (Semi-convex line with additional hollow-grinding, honing, and edge details)
Three broad surface labels
Use these as catalogue-reading cues—not rankings or complete performance specifications.
Convex Edge
An outwardly rounded outer surface. Radius, angle, finish, inner relief, and intended use remain model-specific.
Verify the maker and exact model Visible flat planeBeveled Edge
One or more flat ground planes lead toward the edge. Serration, effort, durability, and technique do not follow from that label alone.
Check finish separately Loose trade termSemi-Convex Edge
Wording for geometry between an obvious flat facet and a continuous rounded surface; makers do not share one fixed midpoint.
Keep the catalogue definition attachedBrowse All Types
Illustrations are navigation markers, not technical evidence. They do not establish exact geometry, material identity, finish or coating identity and properties, adjustment settings, coating colour, hair classification, tooth pattern or removal rate, mechanism, fit, diagnosis, origin, performance, or result.
An outwardly rounded outer grind. The term does not establish one radius, angle, finish, inner relief, behavior, or service method.
Maker-scoped example
JOEWELL blade guide: JOEWELL distinguishes its hand-finished Convex PRO category from its semi-convex Convex Shape category; those names belong to JOEWELL's own system.
What to verify
- Exact maker, model, wording, and dated source
- Outer grind, edge finish, and inner relief as separate fields
- Blade line, section, pairing, condition, and service history
Service boundary
A convex label does not authorize one sharpening sequence. Follow exact-model guidance and ask how the original rounded profile will be identified and preserved.
Loose trade wording for geometry between an obvious flat bevel and a continuous rounded outer surface. Makers do not share one fixed midpoint or plane sequence.
Maker-scoped example
JAGUAR SILVER LINE: JAGUAR combines semi-convex wording with separate partially integrated edge, hollow-grinding, and honing details in this product line.
What to verify
- The maker's definition, drawing, and exact model
- Which planes or curves are actually documented
- Edge finish, inner relief, blade pairing, condition, and history
Service boundary
The trade label alone does not authorize a sharpening process. The provider should identify and preserve the exact model's surface transitions and related geometry.
One or more visible flat ground planes lead toward the cutting edge. The term alone does not establish angle, finish, grip, durability, technique, or service difficulty.
Maker-scoped example
JAGUAR PRE STYLE: JAGUAR describes classic blades with flat cutting angles in this line and specifies polished or single-sided micro-serrated finishes by model.
What to verify
- Number and position of the visible flat planes
- Angle and measurement datum when the maker publishes them
- Polish or serration, inner relief, blade line, condition, and history
Service boundary
A visible flat plane does not make home honing universally safe. Service should preserve the exact model's planes, finish, inner relief, and any documented serration.
Very fine serrations or notches along the cutting line. Makers may use them to limit hair movement, but tooth pitch, profile, host grind, blade side, behavior, and intended use remain model-specific.
Maker-scoped example
JAGUAR PRE STYLE RELAX SLICE: JAGUAR documents one-sided micro-serration on this exact model and separately lists polished PRE STYLE variants, showing that serration and the underlying blade category must be recorded independently.
What to verify
- Exact model and whether one or both blades carry the pattern
- Tooth pitch, profile, depth, and direction when the maker publishes them
- Host grind, edge finish, intended use, condition, and service history
Service boundary
Do not infer a universal back-face-only process or re-cut method. Ask how the provider will identify and preserve the exact model's documented pattern and underlying geometry.
A visible tooth or notch pattern along the cutting line. Terms such as full, coarse, fine, and micro are not shared measurement standards, so tooth scale, pitch, depth, orientation, and blade side must be checked on the exact model.
Maker-scoped example
JAGUAR PRE STYLE RELAX SLICE: JAGUAR's one-sided micro-serration is one documented member of the wider serrated family; it does not define every full-size or coarse serration.
What to verify
- Published tooth count, pitch, depth, profile, and direction
- Which blade carries the pattern and whether the other blade is polished
- Underlying grind, exact maker use statement, condition, and service history
Service boundary
A serrated label does not establish one cleaning, re-cutting, or sharpening procedure. Use exact-model instructions and a provider equipped to preserve the documented tooth geometry.
Trade and translation vocabulary that can overlap hamaguri or other rounded convex descriptions. The label alone does not prove a deeper arc, symmetry, polish level, cutting behavior, or a geometry distinct from convex.
Maker-scoped example
HIKARI company terminology: HIKARI presents hamaguri and convex wording together in its company explanation. That documents HIKARI's usage, not a universal clamshell radius or construction sequence.
What to verify
- Original-language maker term, exact model, and dated source
- Whether the term describes blade section, outer grind, edge finish, or more than one feature
- Published curvature or drawing, inner relief, blade line, condition, and history
Service boundary
A clam or clamshell label does not authorize a special polishing sequence. Follow the exact maker and model evidence; do not generalize one maker's service warning to all rounded edges.
Ambiguous geometry vocabulary. It may describe an inward-curving blade face, an inner-face hollow or relief, or a translated maker category; it is not automatically the ride or contact line and does not identify the cutting-edge finish.
Maker-scoped example
JOEWELL blade guide: JOEWELL includes Concave in its own blade classification. The maker-local category should not be converted into a universal inner-hollow specification without the exact model drawing.
What to verify
- Which face and measurement axis the word concave describes
- Cross-section or maker drawing for the exact model
- Hollow or relief, ride or contact line, outer grind, finish, condition, and history as separate fields
Service boundary
The word concave does not authorize hollow grinding or ride-line work. Any service decision needs exact-model geometry and a provider who can identify the contact surfaces before removing material.
A branded or trade label rather than a demonstrated cross-brand geometry standard. Without the defining maker's drawing, it does not establish multiple radii, symmetry, heel-to-tip variation, blade pairing, performance, or service method.
Maker-scoped example
KAMISORI Jewel SE: KAMISORI uses the wording Japanese 3D Convex for this exact model. The product page documents the maker's label but does not supply an interoperable radius specification.
What to verify
- Defining maker, exact model, wording, and dated source
- Drawing, radius or angle, datum, zone, and the dimension said to vary
- Inner relief, edge finish, blade line, pairing, condition, and service history
Service boundary
Preserve the maker's original label and source, but do not convert 3D into a universal sharpening recipe. Service requires the exact model's documented geometry or direct maker guidance.
A proprietary or loosely reused label whose geometric axis cannot be assumed from the name. It may refer to a plan-view blade line, an outer-face curve, or another model-specific feature, so it is not a universal radius-edge specification.
Maker-scoped example
SAKI K-Blade explanation: SAKI describes its K-Blade with an enlarged-radius explanation and performance claims. Those claims remain SAKI-scoped, and the article does not by itself settle a cross-brand measurement axis.
What to verify
- Exact maker, model, trademark wording, and dated source
- Plan view versus cross-section, with radius, datum, and measured zone when published
- Outer grind, edge finish, inner relief, pairing, condition, and service history
Service boundary
The K-Blade name alone does not authorize a radius-restoration method. A provider should preserve only geometry that the exact maker drawing, measurement, or inspection can establish.
Powered blade-heating technology, not an edge grind. The underlying blade section, outer grind, edge finish, temperature controls, and operating instructions are separate model-specific facts.
Maker-scoped example
JAGUAR TCC operating instructions: The documented TCC system is an example of powered, adjustable heated scissors. Its equipment record does not by itself establish biological, therapeutic, or cosmetic outcomes for a general edge definition.
What to verify
- Exact product and current maker operating manual
- Published settings, inspection, cleaning, and electrical-safety instructions
- Underlying blade geometry, edge finish, equipment condition, and service history
Service boundary
Follow the exact manual for power isolation, inspection, cleaning, and electrical service. Blade work still requires the exact grind and finish; a heated label does not authorize health or hair-repair advice.
A maintenance or marketing claim, not a blade geometry. The current primary-source pass found no hair-scissor maker definition that discloses both a self-sharpening mechanism and a supporting test; that evidence gap is not proof that no such product can exist.
What to verify
- Exact maker, model, wording, date, and primary product source
- Disclosed mechanism, contact surfaces, material asymmetry, and geometry
- Test method, results, limitations, warranty, and service instructions
Service boundary
Do not extend a maintenance interval or use improvised honing from the label alone. Follow exact-model instructions and use observed condition plus qualified inspection to decide when service is needed.
An evidence check for what hamaguri or grind wording does—and does not—establish about manufacturing and service. Exact curvature, finish, process, and repair method remain maker- and model-specific.
Maker-scoped example
HIKARI company terminology: HIKARI uses hamaguri and convex wording in its explanation of its own construction. The source does not establish a universal number of grinding stages, fixed radius, stone process, or country-based service rule.
What to verify
- Original maker term, exact model, translation, and dated source
- Whether the word describes blade section, outer grind, edge finish, or a combined construction
- Curvature or angle with datum, inner relief, blade line, finish, condition, and history
Service boundary
Keep maker-specific warnings attached to that maker and model. Hamaguri wording alone does not authorize a fixed-stage, stone-specific, title-restricted, or country-based sharpening method.
Additional edge references
Specialist blade-line, orientation, and Japanese edge terminology.
Chokuba Straight Blade Line
Chokuba (直刃) is Japanese trade vocabulary for a straight or comparatively straight plan-view blade line. Exact radius, capture, edge grind, and tec...
Open reference →Hamaguri-ba Terminology
A language and catalogue-reading guide to Hamaguri-ba as maker vocabulary for a rounded, convex clam-shell-like profile; dimensions and constructio...
Open reference →Reversed Blade (Gyakuba)
Gyakuba (逆刃) describes a thinning-shear orientation in which the comb or toothed blade is on the moving side. Orientation alone does not determine ...
Open reference →Wave Blade Edge Term
Wave blade is an unresolved marketing and translation term. Verify the exact maker, model, edge or tooth drawing, and published rate before assigni...
Open reference →
Frequently Asked Questions
4 answers you can open one at a timeDoes an edge label tell me which cutting technique to use?
No. The label describes part of the outer geometry. Technique suitability also depends on the exact blade line, section, edge finish, inner relief, tension, condition, hair state, and maker guidance.
Does a beveled edge automatically grip hair?
No. A maker-specified micro-serration may be intended to limit slipping, while a polished edge is a different finish. Bevel and serration must be recorded as separate fields.
Is semi-convex a standardized halfway point?
No shared industry midpoint was found. It is loose trade wording, so retain the maker’s exact definition, model, drawing, and related finish details.
Can a photograph identify the sharpening method?
Not reliably. A photograph can document condition and visible surface transitions, but service should follow exact-model information and a provider able to preserve that construction.