Inner Hollow / Concave
Description
The concave or hollow-ground interior reduces blade contact area for smoother action and less drag. Learn how inner hollowing affects scissor performance and feel.
Inner Hollow / Concave
Quick look
- Friction control: Hollow grinding removes metal behind the edge so blades touch lightly and close without crushing hair.1,2
- Edge support: A polished ride line keeps the razor edge aligned and extends service life.1,2
- Service needs: Poor sharpening that flattens the hollow destroys glide and the shear’s bite.1,2
Why stylists pick it
Every premium convex or semi-convex shear relies on the inner hollow. By carving relief into the interior face, manufacturers ensure only the edge and ride line make contact, which produces the smooth, silent close stylists associate with high-end tools.1,2
Technique map
- Any technique that depends on low resistance-dry detailing, slide work, and point cutting.1
- Supporting daily salon rotations by keeping the edge sharp longer between services.2
- Ensuring tight, even closure during precision barbering work.2
Usage notes
- Perform regular tension tests; a loose pivot lets the hollowed blades chatter and nick the ride line.2
- Keep the interior spotless-lint or hardened product defeats the low-friction design.1
- Avoid tapping blades together or laying them open; protect the ride line from flat surfaces.2
Maintenance
- Choose sharpeners who re-establish the ride line and hollow on specialty stones rather than bench grinders.1,2
- Oil sparingly along the ride line so the edge closes smoothly without attracting debris.1
- Schedule service before the edge feels dull; excessive force can overheat and warp the hollow.2
| Related edges: Convex Edge | Semi-Convex Edge | 3D Convex Edge |
Sources
- Japan Scissors - Hair Scissor Blade Shape and Edges Guide
- Dark Stag - Convex vs. Bevelled vs. Serrated
Verified Sources
- Secondary Japan Scissors Australia (direct sales)
Frequently Asked Questions
The concave or hollow-ground interior reduces blade contact area for smoother action and less drag. Learn how inner hollowing affects scissor performance and feel.
The concave or hollow-ground interior reduces blade contact area for smoother action and less drag. Learn how inner hollowing affects scissor performance and feel. Edge type directly impacts cutting precision, hair damage, and the techniques you can perform.
Inner Hollow / Concave edges can be resharpened by a qualified professional. The sharpening method and frequency depend on the edge geometry, the steel type, and your cutting volume. Always use a sharpener experienced with this specific edge profile.