Flap Steak vs Sirloin Cap — What's the Difference?
Quick Answer
Flap Steak (flap steak (sirloin flap)) and Sirloin Cap (sirloin cap) are not the same cut: Flap Steak is sirloin primal (Bottom sirloin, obliquus internus abdominis muscle); Sirloin Cap is sirloin primal (top sirloin cap (coulotte)).
Canonical entities: Flap Steak · Sirloin Cap
Side-by-side
| flap steak | sirloin cap | |
|---|---|---|
| Primal | sirloin | sirloin |
| Muscle / location | Bottom sirloin, obliquus internus abdominis muscle | top sirloin cap (coulotte) |
| Character | A thin, coarse-grained steak from the bottom sirloin. The American name for what the French call bavette d'aloyau. Open grain absorbs marinades extremely well. Popular for fajitas, stir-fry, and carne asada. Often confused with skirt steak but from a different location entirely. | Triangular cap on the top sirloin; prized as picanha in Brazil. |
Key differences
- Texture and slicing: compare fibrous, grain-heavy cuts vs more tender steak-style muscles based on each cut’s description.
- Retail naming diverges by country—always map through a canonical cut when translating menus or labels.
When to use each
Flap Steak
Pick Flap Steak when you want its specific marbling/texture profile: A thin, coarse-grained steak from the bottom sirloin. The American name for what the French call bavette d'aloyau. Open grain absorbs marinades extremely well. Popular for fajitas, stir-fry, and carne asada. Often confused with skirt steak but from a different location entirely.
Sirloin Cap
Pick Sirloin Cap when its primal/muscle traits fit the dish: Triangular cap on the top sirloin; prized as picanha in Brazil.
Flap Steak and Sirloin Cap are different canonical muscles/primals: Flap Steak is sirloin (Bottom sirloin, obliquus internus abdominis muscle); Sirloin Cap is sirloin (top sirloin cap (coulotte)).
Choose based on tenderness, marbling, grain direction, and how you plan to cook (sear vs braise vs slice thin).
Read the full guides: flap steak (what-is) · sirloin cap (what-is) · flap steak hub · sirloin cap hub