Convex vs. Bevelled Edge Scissors: Which Is Right for Your Technique?
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Convex vs. Bevelled Edge Scissors: Which Is Right for Your Technique?
The edge of your scissor blade is the single most important factor in cut quality. Not the steel, not the handle, not the brand. The edge geometry determines whether hair is sliced cleanly or crushed, whether your hand fatigues in 2 hours or 8, and how often you need professional sharpening.
Yet most stylists can't tell you which edge type they're using. After sharpening over 100,000 pairs of scissors, here's the breakdown that actually matters.
What Is a Convex Edge?
A convex edge (also called a hollow-ground or clamshell edge) is ground to an extremely sharp, thin profile by curving the blade face inward. Think of it as a razor blade built into a scissor. The cutting angle is typically between 40° and 50°, creating a fine edge that slices through hair with minimal resistance.
How it cuts: The hair is sliced rather than chopped. The thin edge parts the hair strand with minimal deformation, leaving a clean cut surface that lies flat and resists fraying.
Hand feel: Extremely smooth and effortless. A well-maintained convex edge requires barely any closing pressure. Your hand stays relaxed all day.
Best techniques: Slide cutting, point cutting, channel cutting, precision texturising, and any technique where the hair needs to glide along or across the blade.
What Is a Bevelled Edge?
A bevelled edge is ground at a visible, flat angle along the blade face. It's thicker and more robust than a convex edge, with a cutting angle typically between 30° and 40°. Think of it as a chisel — strong, durable, and decisive.
How it cuts: The hair is chopped at a fixed point where the blades meet. There's more mechanical force involved — the blades close firmly onto the hair rather than slicing through it.
Hand feel: Slightly firmer than convex. You feel a definite "snip" on each closure. Requires more hand pressure but provides more tactile feedback.
Best techniques: Blunt cutting, scissor-over-comb, heavy sectioning, and any technique where you need a decisive, firm cut at a specific point.
Side-by-Side Comparison
| Feature | Convex Edge | Bevelled Edge |
|---|---|---|
| Cutting action | Slicing (smooth, effortless) | Chopping (firm, decisive) |
| Blade angle | 40°–50° (thin, sharp) | 30°–40° (thicker, robust) |
| Hand fatigue | Very low | Moderate |
| Best for | Slide cut, point cut, texturising | Blunt cut, scissor-over-comb, bulk removal |
| Durability | More fragile — chips if dropped | Very durable — handles impact well |
| Maintenance | Requires expert sharpening | Easier and cheaper to sharpen |
| Sharpening interval | 6–18 months | 4–12 months |
| Price impact | Typically $50–$150 more | Standard pricing |
| Learning curve | Higher — requires lighter touch | Lower — more forgiving |
| Hair damage risk | Very low (clean slice) | Higher if dull (crushes cuticle) |
Semi-Convex: The Middle Ground
Many modern hairdressing scissors use a semi-convex edge — a hybrid that combines convex sharpness with bevelled durability. The blade is partially hollow-ground but retains a small flat at the cutting edge. It's a practical compromise that works well for stylists who do a mix of techniques and don't want to carry two different scissors.
Most ShearGenius scissors in the mid-range use a semi-convex edge, with our premium lines (Prodigy, Rose Tattoo, Diamond) offering a full convex grind for maximum cutting performance.
How to Tell Which Edge You Have
Hold your scissor blade up to a light source and look at the inner face of the blade (the side that faces the other blade when closed):
Convex: You'll see a subtle inward curve — the blade face is concave, like the inside of a spoon. The edge itself is almost invisible to the naked eye.
Bevelled: You'll see a flat, angled surface running along the edge. It's clearly visible as a shiny strip along the cutting line.
Semi-convex: You'll see a slight inward curve with a small flat at the very edge. It looks like a convex blade with a tiny bevel at the tip.
If you're still not sure, bring them to your next sharpening appointment. We identify the edge type before touching any blade.
Which Should You Choose?
Match the edge to your dominant technique:
If 60%+ of your work is precision cutting, layering, and texturising: Go convex. The effortless slicing action and reduced hand fatigue are worth the slightly higher maintenance cost.
If 60%+ of your work is blunt cutting, bobs, and scissor-over-comb: Go bevelled or semi-convex. You need the durability and decisive cut that these edges provide.
If you do a 50/50 mix: Semi-convex is your best option. It handles both precision and blunt work competently without excelling or failing at either.
Book a sharpening to assess your current edge
Frequently Asked Questions
Can I convert a bevelled edge to convex?
Yes, but it requires significant material removal and should only be done by a specialist. The blade needs to be re-ground to create the hollow profile. It's usually more cost-effective to buy a convex-edge scissor than to convert a bevelled one.
Do convex scissors cost more to sharpen?
Typically yes — convex sharpening requires more skill and time than bevelled sharpening. Expect to pay $10–$20 more per service. However, convex edges generally need less frequent sharpening, so the annual cost is comparable.
Are bevelled scissors worse?
No. They're different tools for different techniques. A bevelled edge on a quality scissor cuts beautifully for blunt work and is significantly more durable. Many competition barbers exclusively use bevelled edges. "Worse" only applies if you're using the wrong edge for the technique.