Scalpel Blade Sizes Chart: Which Blade Fits Which Handle?
Which scalpel blade fits which handle – and which blade shape is right for which cut? This guide covers all common scalpel blade sizes, the matching handles and answers to the most frequent questions.
Key facts at a glance
- No. 3 handle (3L, 7, BP): small blades No. 10, 11, 12, 15, 15C
- No. 4 handle (4L): large blades No. 20 to 25
- Most used blade: No. 15 – standard in oral surgery and dermatology
- For stab incisions: No. 11, for sulcular incisions: No. 12
Scalpel blade sizes chart: which blade fits which handle?
Scalpel blades come with two fitting sizes. Small blades (No. 9–17) fit a No. 3 handle and its variants, large blades (No. 18–36) fit a No. 4 handle.
| Scalpel handle | Compatible blades | Typical use |
|---|---|---|
| No. 3 handle (also 3L, No. 7, BP handle) | No. 10, 11, 12, 15, 15C | Fine, precise cuts, oral surgery, dermatology, plastic surgery |
| No. 4 handle (also 4L) | No. 20, 21, 22, 23, 24, 25 | Large skin incisions, general surgery, orthopaedics, pathology |
Blades for a No. 3 scalpel handle
| Blade | Shape | Use |
|---|---|---|
| No. 10 | Curved cutting edge, classic shape | Skin incisions and standard cuts in general surgery |
| No. 11 | Triangular, pointed, straight edge | Stab incisions, abscess drainage, arteriotomy, suture removal |
| No. 12 | Crescent-shaped, cutting on the inner edge | Suture removal, ENT, sulcular incisions in dentistry |
| No. 15 | Small, curved edge | The most used blade: short, precise cuts, oral surgery, excision of small skin lesions |
| No. 15C | Slimmer version of No. 15 | Periodontal surgery, flaps in tight areas |
Blades for a No. 4 scalpel handle
| Blade | Shape | Use |
|---|---|---|
| No. 20 | Large, curved edge | Orthopaedics, general surgery |
| No. 21 | Like No. 20, slightly larger | Long skin incisions |
| No. 22 | Large version of No. 10 | Large incisions, thoracic and abdominal surgery |
| No. 23 | Leaf-shaped, pointed | Long abdominal incisions |
| No. 24 | Semi-circular | General surgery, pathology and autopsy |
| No. 25 | Large blade with straight edge | General surgery |
Which scalpel blade for which purpose?
- Dentistry and oral surgery: No. 15 and 15C for incisions and flaps, No. 12 for sulcular incisions.
- Stab incision and abscess: No. 11.
- Standard skin incision: No. 10 (handle 3) or No. 22 for large cuts (handle 4).
- Fine work and microsurgery: No. 15 on a slim handle such as a microsurgical scalpel handle.
Choosing the right scalpel handle
The No. 3 handle is the standard for small blades. The graduated version with a scale also lets you measure short distances. The No. 7 handle is slimmer and held like a pencil – ideal for fine cuts. For large blades, choose a No. 4 or 4L handle. You will find all handles in our scalpels and knives category.
FAQ: scalpel blade sizes
What size scalpel blade fits on a No. 4 scalpel handle?
A No. 4 or 4L handle takes the large blades No. 18 to 36, in practice mostly No. 20 to 25.
What blades fit a No. 3 scalpel handle?
A No. 3, 3L or No. 7 handle takes the small blades No. 9 to 17, most often No. 10, 11, 12 and 15.
Does a No. 10 blade fit a No. 4 handle?
No. A No. 10 blade has the small fitting and only fits a No. 3 handle and its variants. The large equivalent for a No. 4 handle is the No. 22 blade.
Which scalpel blade is used most often?
The No. 15 blade. It is small and curved and suits short, precise cuts – that is why it is the standard in oral surgery and dermatology.
What is a No. 11 blade used for?
The pointed, triangular No. 11 blade is used for stab incisions, for example to drain an abscess or to cut sutures.